4419 lines
180 KiB
Java
4419 lines
180 KiB
Java
/*
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* Copyright (c) 1994, 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang;
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import java.lang.annotation.Annotation;
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import java.lang.constant.ClassDesc;
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import java.lang.invoke.TypeDescriptor;
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import java.lang.invoke.MethodHandles;
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import java.lang.module.ModuleReader;
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import java.lang.ref.SoftReference;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.ObjectStreamField;
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import java.lang.reflect.AnnotatedElement;
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import java.lang.reflect.AnnotatedType;
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import java.lang.reflect.Array;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Executable;
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import java.lang.reflect.Field;
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import java.lang.reflect.GenericArrayType;
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import java.lang.reflect.GenericDeclaration;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Member;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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import java.lang.reflect.Proxy;
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import java.lang.reflect.RecordComponent;
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import java.lang.reflect.Type;
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import java.lang.reflect.TypeVariable;
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import java.lang.constant.Constable;
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import java.net.URL;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.HashMap;
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import java.util.LinkedHashMap;
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import java.util.LinkedHashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Objects;
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import java.util.Optional;
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import java.util.stream.Collectors;
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import jdk.internal.loader.BootLoader;
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import jdk.internal.loader.BuiltinClassLoader;
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import jdk.internal.misc.Unsafe;
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import jdk.internal.module.Resources;
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import jdk.internal.reflect.CallerSensitive;
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import jdk.internal.reflect.ConstantPool;
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import jdk.internal.reflect.Reflection;
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import jdk.internal.reflect.ReflectionFactory;
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import jdk.internal.vm.annotation.ForceInline;
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import jdk.internal.vm.annotation.IntrinsicCandidate;
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import sun.invoke.util.Wrapper;
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import sun.reflect.generics.factory.CoreReflectionFactory;
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import sun.reflect.generics.factory.GenericsFactory;
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import sun.reflect.generics.repository.ClassRepository;
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import sun.reflect.generics.repository.MethodRepository;
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import sun.reflect.generics.repository.ConstructorRepository;
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import sun.reflect.generics.scope.ClassScope;
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import sun.security.util.SecurityConstants;
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import sun.reflect.annotation.*;
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import sun.reflect.misc.ReflectUtil;
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/**
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* Instances of the class {@code Class} represent classes and
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* interfaces in a running Java application. An enum type and a record
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* type are kinds of class; an annotation type is a kind of
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* interface. Every array also belongs to a class that is reflected as
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* a {@code Class} object that is shared by all arrays with the same
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* element type and number of dimensions. The primitive Java types
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* ({@code boolean}, {@code byte}, {@code char}, {@code short}, {@code
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* int}, {@code long}, {@code float}, and {@code double}), and the
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* keyword {@code void} are also represented as {@code Class} objects.
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*
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* <p> {@code Class} has no public constructor. Instead a {@code Class}
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* object is constructed automatically by the Java Virtual Machine when
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* a class is derived from the bytes of a {@code class} file through
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* the invocation of one of the following methods:
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* <ul>
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* <li> {@link ClassLoader#defineClass(String, byte[], int, int) ClassLoader::defineClass}
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* <li> {@link java.lang.invoke.MethodHandles.Lookup#defineClass(byte[])
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* java.lang.invoke.MethodHandles.Lookup::defineClass}
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* <li> {@link java.lang.invoke.MethodHandles.Lookup#defineHiddenClass(byte[], boolean, MethodHandles.Lookup.ClassOption...)
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* java.lang.invoke.MethodHandles.Lookup::defineHiddenClass}
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* </ul>
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*
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* <p> The methods of class {@code Class} expose many characteristics of a
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* class or interface. Most characteristics are derived from the {@code class}
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* file that the class loader passed to the Java Virtual Machine or
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* from the {@code class} file passed to {@code Lookup::defineClass}
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* or {@code Lookup::defineHiddenClass}.
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* A few characteristics are determined by the class loading environment
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* at run time, such as the module returned by {@link #getModule() getModule()}.
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*
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* <p> The following example uses a {@code Class} object to print the
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* class name of an object:
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*
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* <blockquote><pre>
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* void printClassName(Object obj) {
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* System.out.println("The class of " + obj +
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* " is " + obj.getClass().getName());
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* }
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* </pre></blockquote>
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*
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* It is also possible to get the {@code Class} object for a named
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* type (or for {@code void}) using a <i>class literal</i>.
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* For example:
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*
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* <blockquote>
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* {@code System.out.println("The name of class Foo is: "+Foo.class.getName());}
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* </blockquote>
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*
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* <p> Some methods of class {@code Class} expose whether the declaration of
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* a class or interface in Java source code was <em>enclosed</em> within
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* another declaration. Other methods describe how a class or interface
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* is situated in a <em>nest</em>. A <a id="nest">nest</a> is a set of
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* classes and interfaces, in the same run-time package, that
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* allow mutual access to their {@code private} members.
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* The classes and interfaces are known as <em>nestmates</em>.
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* One nestmate acts as the
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* <em>nest host</em>, and enumerates the other nestmates which
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* belong to the nest; each of them in turn records it as the nest host.
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* The classes and interfaces which belong to a nest, including its host, are
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* determined when
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* {@code class} files are generated, for example, a Java compiler
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* will typically record a top-level class as the host of a nest where the
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* other members are the classes and interfaces whose declarations are
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* enclosed within the top-level class declaration.
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*
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* <p> A class or interface created by the invocation of
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* {@link java.lang.invoke.MethodHandles.Lookup#defineHiddenClass(byte[], boolean, MethodHandles.Lookup.ClassOption...)
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* Lookup::defineHiddenClass} is a {@linkplain Class#isHidden() <em>hidden</em>}
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* class or interface.
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* All kinds of class, including enum types and record types, may be
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* hidden classes; all kinds of interface, including annotation types,
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* may be hidden interfaces.
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*
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* The {@linkplain #getName() name of a hidden class or interface} is
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* not a <a href="ClassLoader.html#binary-name">binary name</a>,
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* which means the following:
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* <ul>
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* <li>A hidden class or interface cannot be referenced by the constant pools
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* of other classes and interfaces.
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* <li>A hidden class or interface cannot be described in
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* {@linkplain java.lang.constant.ConstantDesc <em>nominal form</em>} by
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* {@link #describeConstable() Class::describeConstable},
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* {@link ClassDesc#of(String) ClassDesc::of}, or
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* {@link ClassDesc#ofDescriptor(String) ClassDesc::ofDescriptor}.
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* <li>A hidden class or interface cannot be discovered by {@link #forName Class::forName}
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* or {@link ClassLoader#loadClass(String, boolean) ClassLoader::loadClass}.
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* </ul>
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*
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* A hidden class or interface is never an array class, but may be
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* the element type of an array. In all other respects, the fact that
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* a class or interface is hidden has no bearing on the characteristics
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* exposed by the methods of class {@code Class}.
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*
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* @param <T> the type of the class modeled by this {@code Class}
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* object. For example, the type of {@code String.class} is {@code
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* Class<String>}. Use {@code Class<?>} if the class being modeled is
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* unknown.
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*
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* @see java.lang.ClassLoader#defineClass(byte[], int, int)
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* @since 1.0
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* @jls 15.8.2 Class Literals
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*/
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public final class Class<T> implements java.io.Serializable,
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GenericDeclaration,
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Type,
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AnnotatedElement,
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TypeDescriptor.OfField<Class<?>>,
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Constable {
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private static final int ANNOTATION= 0x00002000;
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private static final int ENUM = 0x00004000;
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private static final int SYNTHETIC = 0x00001000;
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private static final ClassDesc[] EMPTY_CLASS_DESC_ARRAY = new ClassDesc[0];
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private static native void registerNatives();
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static {
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registerNatives();
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}
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/*
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* Private constructor. Only the Java Virtual Machine creates Class objects.
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* This constructor is not used and prevents the default constructor being
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* generated.
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*/
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private Class(ClassLoader loader, Class<?> arrayComponentType) {
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// Initialize final field for classLoader. The initialization value of non-null
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// prevents future JIT optimizations from assuming this final field is null.
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classLoader = loader;
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componentType = arrayComponentType;
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}
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/**
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* Converts the object to a string. The string representation is the
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* string "class" or "interface", followed by a space, and then by the
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* name of the class in the format returned by {@code getName}.
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* If this {@code Class} object represents a primitive type,
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* this method returns the name of the primitive type. If
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* this {@code Class} object represents void this method returns
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* "void". If this {@code Class} object represents an array type,
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* this method returns "class " followed by {@code getName}.
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*
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* @return a string representation of this {@code Class} object.
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*/
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public String toString() {
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return (isInterface() ? "interface " : (isPrimitive() ? "" : "class "))
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+ getName();
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}
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/**
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* Returns a string describing this {@code Class}, including
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* information about modifiers and type parameters.
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*
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* The string is formatted as a list of type modifiers, if any,
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* followed by the kind of type (empty string for primitive types
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* and {@code class}, {@code enum}, {@code interface},
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* {@code @interface}, or {@code record} as appropriate), followed
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* by the type's name, followed by an angle-bracketed
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* comma-separated list of the type's type parameters, if any,
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* including informative bounds on the type parameters, if any.
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*
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* A space is used to separate modifiers from one another and to
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* separate any modifiers from the kind of type. The modifiers
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* occur in canonical order. If there are no type parameters, the
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* type parameter list is elided.
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*
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* For an array type, the string starts with the type name,
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* followed by an angle-bracketed comma-separated list of the
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* type's type parameters, if any, followed by a sequence of
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* {@code []} characters, one set of brackets per dimension of
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* the array.
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*
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* <p>Note that since information about the runtime representation
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* of a type is being generated, modifiers not present on the
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* originating source code or illegal on the originating source
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* code may be present.
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*
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* @return a string describing this {@code Class}, including
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* information about modifiers and type parameters
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*
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* @since 1.8
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*/
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@SuppressWarnings("preview")
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public String toGenericString() {
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if (isPrimitive()) {
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return toString();
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} else {
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StringBuilder sb = new StringBuilder();
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Class<?> component = this;
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int arrayDepth = 0;
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if (isArray()) {
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do {
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arrayDepth++;
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component = component.getComponentType();
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} while (component.isArray());
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sb.append(component.getName());
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} else {
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// Class modifiers are a superset of interface modifiers
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int modifiers = getModifiers() & Modifier.classModifiers();
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if (modifiers != 0) {
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sb.append(Modifier.toString(modifiers));
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sb.append(' ');
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}
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if (isAnnotation()) {
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sb.append('@');
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}
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if (isInterface()) { // Note: all annotation types are interfaces
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sb.append("interface");
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} else {
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if (isEnum())
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sb.append("enum");
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else if (isRecord())
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sb.append("record");
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else
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sb.append("class");
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}
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sb.append(' ');
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sb.append(getName());
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}
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TypeVariable<?>[] typeparms = component.getTypeParameters();
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if (typeparms.length > 0) {
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sb.append(Arrays.stream(typeparms)
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.map(Class::typeVarBounds)
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.collect(Collectors.joining(",", "<", ">")));
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}
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if (arrayDepth > 0) sb.append("[]".repeat(arrayDepth));
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return sb.toString();
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}
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}
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static String typeVarBounds(TypeVariable<?> typeVar) {
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Type[] bounds = typeVar.getBounds();
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if (bounds.length == 1 && bounds[0].equals(Object.class)) {
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return typeVar.getName();
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} else {
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return typeVar.getName() + " extends " +
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Arrays.stream(bounds)
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.map(Type::getTypeName)
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.collect(Collectors.joining(" & "));
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}
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}
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/**
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* Returns the {@code Class} object associated with the class or
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* interface with the given string name. Invoking this method is
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* equivalent to:
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*
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* <blockquote>
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* {@code Class.forName(className, true, currentLoader)}
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* </blockquote>
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*
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* where {@code currentLoader} denotes the defining class loader of
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* the current class.
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*
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* <p> For example, the following code fragment returns the
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* runtime {@code Class} descriptor for the class named
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* {@code java.lang.Thread}:
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*
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* <blockquote>
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* {@code Class t = Class.forName("java.lang.Thread")}
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* </blockquote>
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* <p>
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* A call to {@code forName("X")} causes the class named
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* {@code X} to be initialized.
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*
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* @param className the fully qualified name of the desired class.
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* @return the {@code Class} object for the class with the
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* specified name.
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* @throws LinkageError if the linkage fails
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* @throws ExceptionInInitializerError if the initialization provoked
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* by this method fails
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* @throws ClassNotFoundException if the class cannot be located
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*
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* @jls 12.2 Loading of Classes and Interfaces
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* @jls 12.3 Linking of Classes and Interfaces
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* @jls 12.4 Initialization of Classes and Interfaces
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*/
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@CallerSensitive
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public static Class<?> forName(String className)
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throws ClassNotFoundException {
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Class<?> caller = Reflection.getCallerClass();
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return forName0(className, true, ClassLoader.getClassLoader(caller), caller);
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}
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/**
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* Returns the {@code Class} object associated with the class or
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* interface with the given string name, using the given class loader.
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* Given the fully qualified name for a class or interface (in the same
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* format returned by {@code getName}) this method attempts to
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* locate and load the class or interface. The specified class
|
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* loader is used to load the class or interface. If the parameter
|
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* {@code loader} is null, the class is loaded through the bootstrap
|
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* class loader. The class is initialized only if the
|
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* {@code initialize} parameter is {@code true} and if it has
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* not been initialized earlier.
|
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*
|
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* <p> If {@code name} denotes a primitive type or void, an attempt
|
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* will be made to locate a user-defined class in the unnamed package whose
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* name is {@code name}. Therefore, this method cannot be used to
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* obtain any of the {@code Class} objects representing primitive
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* types or void.
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*
|
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* <p> If {@code name} denotes an array class, the component type of
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* the array class is loaded but not initialized.
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*
|
|
* <p> For example, in an instance method the expression:
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*
|
|
* <blockquote>
|
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* {@code Class.forName("Foo")}
|
|
* </blockquote>
|
|
*
|
|
* is equivalent to:
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*
|
|
* <blockquote>
|
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* {@code Class.forName("Foo", true, this.getClass().getClassLoader())}
|
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* </blockquote>
|
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*
|
|
* Note that this method throws errors related to loading, linking
|
|
* or initializing as specified in Sections {@jls 12.2}, {@jls
|
|
* 12.3}, and {@jls 12.4} of <cite>The Java Language
|
|
* Specification</cite>.
|
|
* Note that this method does not check whether the requested class
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* is accessible to its caller.
|
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*
|
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* @param name fully qualified name of the desired class
|
|
|
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* @param initialize if {@code true} the class will be initialized
|
|
* (which implies linking). See Section {@jls
|
|
* 12.4} of <cite>The Java Language
|
|
* Specification</cite>.
|
|
* @param loader class loader from which the class must be loaded
|
|
* @return class object representing the desired class
|
|
*
|
|
* @throws LinkageError if the linkage fails
|
|
* @throws ExceptionInInitializerError if the initialization provoked
|
|
* by this method fails
|
|
* @throws ClassNotFoundException if the class cannot be located by
|
|
* the specified class loader
|
|
* @throws SecurityException
|
|
* if a security manager is present, and the {@code loader} is
|
|
* {@code null}, and the caller's class loader is not
|
|
* {@code null}, and the caller does not have the
|
|
* {@link RuntimePermission}{@code ("getClassLoader")}
|
|
*
|
|
* @see java.lang.Class#forName(String)
|
|
* @see java.lang.ClassLoader
|
|
*
|
|
* @jls 12.2 Loading of Classes and Interfaces
|
|
* @jls 12.3 Linking of Classes and Interfaces
|
|
* @jls 12.4 Initialization of Classes and Interfaces
|
|
* @since 1.2
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|
*/
|
|
@CallerSensitive
|
|
public static Class<?> forName(String name, boolean initialize,
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ClassLoader loader)
|
|
throws ClassNotFoundException
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|
{
|
|
Class<?> caller = null;
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
// Reflective call to get caller class is only needed if a security manager
|
|
// is present. Avoid the overhead of making this call otherwise.
|
|
caller = Reflection.getCallerClass();
|
|
if (loader == null) {
|
|
ClassLoader ccl = ClassLoader.getClassLoader(caller);
|
|
if (ccl != null) {
|
|
sm.checkPermission(
|
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SecurityConstants.GET_CLASSLOADER_PERMISSION);
|
|
}
|
|
}
|
|
}
|
|
return forName0(name, initialize, loader, caller);
|
|
}
|
|
|
|
/** Called after security check for system loader access checks have been made. */
|
|
private static native Class<?> forName0(String name, boolean initialize,
|
|
ClassLoader loader,
|
|
Class<?> caller)
|
|
throws ClassNotFoundException;
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|
|
|
|
/**
|
|
* Returns the {@code Class} with the given <a href="ClassLoader.html#binary-name">
|
|
* binary name</a> in the given module.
|
|
*
|
|
* <p> This method attempts to locate and load the class or interface.
|
|
* It does not link the class, and does not run the class initializer.
|
|
* If the class is not found, this method returns {@code null}. </p>
|
|
*
|
|
* <p> If the class loader of the given module defines other modules and
|
|
* the given name is a class defined in a different module, this method
|
|
* returns {@code null} after the class is loaded. </p>
|
|
*
|
|
* <p> This method does not check whether the requested class is
|
|
* accessible to its caller. </p>
|
|
*
|
|
* @apiNote
|
|
* This method returns {@code null} on failure rather than
|
|
* throwing a {@link ClassNotFoundException}, as is done by
|
|
* the {@link #forName(String, boolean, ClassLoader)} method.
|
|
* The security check is a stack-based permission check if the caller
|
|
* loads a class in another module.
|
|
*
|
|
* @param module A module
|
|
* @param name The <a href="ClassLoader.html#binary-name">binary name</a>
|
|
* of the class
|
|
* @return {@code Class} object of the given name defined in the given module;
|
|
* {@code null} if not found.
|
|
*
|
|
* @throws NullPointerException if the given module or name is {@code null}
|
|
*
|
|
* @throws LinkageError if the linkage fails
|
|
*
|
|
* @throws SecurityException
|
|
* <ul>
|
|
* <li> if the caller is not the specified module and
|
|
* {@code RuntimePermission("getClassLoader")} permission is denied; or</li>
|
|
* <li> access to the module content is denied. For example,
|
|
* permission check will be performed when a class loader calls
|
|
* {@link ModuleReader#open(String)} to read the bytes of a class file
|
|
* in a module.</li>
|
|
* </ul>
|
|
*
|
|
* @jls 12.2 Loading of Classes and Interfaces
|
|
* @jls 12.3 Linking of Classes and Interfaces
|
|
* @since 9
|
|
*/
|
|
@CallerSensitive
|
|
public static Class<?> forName(Module module, String name) {
|
|
Objects.requireNonNull(module);
|
|
Objects.requireNonNull(name);
|
|
|
|
ClassLoader cl;
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
Class<?> caller = Reflection.getCallerClass();
|
|
if (caller != null && caller.getModule() != module) {
|
|
// if caller is null, Class.forName is the last java frame on the stack.
|
|
// java.base has all permissions
|
|
sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION);
|
|
}
|
|
PrivilegedAction<ClassLoader> pa = module::getClassLoader;
|
|
cl = AccessController.doPrivileged(pa);
|
|
} else {
|
|
cl = module.getClassLoader();
|
|
}
|
|
|
|
if (cl != null) {
|
|
return cl.loadClass(module, name);
|
|
} else {
|
|
return BootLoader.loadClass(module, name);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Creates a new instance of the class represented by this {@code Class}
|
|
* object. The class is instantiated as if by a {@code new}
|
|
* expression with an empty argument list. The class is initialized if it
|
|
* has not already been initialized.
|
|
*
|
|
* @deprecated This method propagates any exception thrown by the
|
|
* nullary constructor, including a checked exception. Use of
|
|
* this method effectively bypasses the compile-time exception
|
|
* checking that would otherwise be performed by the compiler.
|
|
* The {@link
|
|
* java.lang.reflect.Constructor#newInstance(java.lang.Object...)
|
|
* Constructor.newInstance} method avoids this problem by wrapping
|
|
* any exception thrown by the constructor in a (checked) {@link
|
|
* java.lang.reflect.InvocationTargetException}.
|
|
*
|
|
* <p>The call
|
|
*
|
|
* <pre>{@code
|
|
* clazz.newInstance()
|
|
* }</pre>
|
|
*
|
|
* can be replaced by
|
|
*
|
|
* <pre>{@code
|
|
* clazz.getDeclaredConstructor().newInstance()
|
|
* }</pre>
|
|
*
|
|
* The latter sequence of calls is inferred to be able to throw
|
|
* the additional exception types {@link
|
|
* InvocationTargetException} and {@link
|
|
* NoSuchMethodException}. Both of these exception types are
|
|
* subclasses of {@link ReflectiveOperationException}.
|
|
*
|
|
* @return a newly allocated instance of the class represented by this
|
|
* object.
|
|
* @throws IllegalAccessException if the class or its nullary
|
|
* constructor is not accessible.
|
|
* @throws InstantiationException
|
|
* if this {@code Class} represents an abstract class,
|
|
* an interface, an array class, a primitive type, or void;
|
|
* or if the class has no nullary constructor;
|
|
* or if the instantiation fails for some other reason.
|
|
* @throws ExceptionInInitializerError if the initialization
|
|
* provoked by this method fails.
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and
|
|
* the caller's class loader is not the same as or an
|
|
* ancestor of the class loader for the current class and
|
|
* invocation of {@link SecurityManager#checkPackageAccess
|
|
* s.checkPackageAccess()} denies access to the package
|
|
* of this class.
|
|
*/
|
|
@CallerSensitive
|
|
@Deprecated(since="9")
|
|
public T newInstance()
|
|
throws InstantiationException, IllegalAccessException
|
|
{
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), false);
|
|
}
|
|
|
|
// Constructor lookup
|
|
Constructor<T> tmpConstructor = cachedConstructor;
|
|
if (tmpConstructor == null) {
|
|
if (this == Class.class) {
|
|
throw new IllegalAccessException(
|
|
"Can not call newInstance() on the Class for java.lang.Class"
|
|
);
|
|
}
|
|
try {
|
|
Class<?>[] empty = {};
|
|
final Constructor<T> c = getReflectionFactory().copyConstructor(
|
|
getConstructor0(empty, Member.DECLARED));
|
|
// Disable accessibility checks on the constructor
|
|
// access check is done with the true caller
|
|
java.security.AccessController.doPrivileged(
|
|
new java.security.PrivilegedAction<>() {
|
|
public Void run() {
|
|
c.setAccessible(true);
|
|
return null;
|
|
}
|
|
});
|
|
cachedConstructor = tmpConstructor = c;
|
|
} catch (NoSuchMethodException e) {
|
|
throw (InstantiationException)
|
|
new InstantiationException(getName()).initCause(e);
|
|
}
|
|
}
|
|
|
|
try {
|
|
Class<?> caller = Reflection.getCallerClass();
|
|
return getReflectionFactory().newInstance(tmpConstructor, null, caller);
|
|
} catch (InvocationTargetException e) {
|
|
Unsafe.getUnsafe().throwException(e.getTargetException());
|
|
// Not reached
|
|
return null;
|
|
}
|
|
}
|
|
|
|
private transient volatile Constructor<T> cachedConstructor;
|
|
|
|
/**
|
|
* Determines if the specified {@code Object} is assignment-compatible
|
|
* with the object represented by this {@code Class}. This method is
|
|
* the dynamic equivalent of the Java language {@code instanceof}
|
|
* operator. The method returns {@code true} if the specified
|
|
* {@code Object} argument is non-null and can be cast to the
|
|
* reference type represented by this {@code Class} object without
|
|
* raising a {@code ClassCastException.} It returns {@code false}
|
|
* otherwise.
|
|
*
|
|
* <p> Specifically, if this {@code Class} object represents a
|
|
* declared class, this method returns {@code true} if the specified
|
|
* {@code Object} argument is an instance of the represented class (or
|
|
* of any of its subclasses); it returns {@code false} otherwise. If
|
|
* this {@code Class} object represents an array class, this method
|
|
* returns {@code true} if the specified {@code Object} argument
|
|
* can be converted to an object of the array class by an identity
|
|
* conversion or by a widening reference conversion; it returns
|
|
* {@code false} otherwise. If this {@code Class} object
|
|
* represents an interface, this method returns {@code true} if the
|
|
* class or any superclass of the specified {@code Object} argument
|
|
* implements this interface; it returns {@code false} otherwise. If
|
|
* this {@code Class} object represents a primitive type, this method
|
|
* returns {@code false}.
|
|
*
|
|
* @param obj the object to check
|
|
* @return true if {@code obj} is an instance of this class
|
|
*
|
|
* @since 1.1
|
|
*/
|
|
@IntrinsicCandidate
|
|
public native boolean isInstance(Object obj);
|
|
|
|
|
|
/**
|
|
* Determines if the class or interface represented by this
|
|
* {@code Class} object is either the same as, or is a superclass or
|
|
* superinterface of, the class or interface represented by the specified
|
|
* {@code Class} parameter. It returns {@code true} if so;
|
|
* otherwise it returns {@code false}. If this {@code Class}
|
|
* object represents a primitive type, this method returns
|
|
* {@code true} if the specified {@code Class} parameter is
|
|
* exactly this {@code Class} object; otherwise it returns
|
|
* {@code false}.
|
|
*
|
|
* <p> Specifically, this method tests whether the type represented by the
|
|
* specified {@code Class} parameter can be converted to the type
|
|
* represented by this {@code Class} object via an identity conversion
|
|
* or via a widening reference conversion. See <cite>The Java Language
|
|
* Specification</cite>, sections {@jls 5.1.1} and {@jls 5.1.4},
|
|
* for details.
|
|
*
|
|
* @param cls the {@code Class} object to be checked
|
|
* @return the {@code boolean} value indicating whether objects of the
|
|
* type {@code cls} can be assigned to objects of this class
|
|
* @throws NullPointerException if the specified Class parameter is
|
|
* null.
|
|
* @since 1.1
|
|
*/
|
|
@IntrinsicCandidate
|
|
public native boolean isAssignableFrom(Class<?> cls);
|
|
|
|
|
|
/**
|
|
* Determines if this {@code Class} object represents an
|
|
* interface type.
|
|
*
|
|
* @return {@code true} if this {@code Class} object represents an interface;
|
|
* {@code false} otherwise.
|
|
*/
|
|
@IntrinsicCandidate
|
|
public native boolean isInterface();
|
|
|
|
|
|
/**
|
|
* Determines if this {@code Class} object represents an array class.
|
|
*
|
|
* @return {@code true} if this {@code Class} object represents an array class;
|
|
* {@code false} otherwise.
|
|
* @since 1.1
|
|
*/
|
|
@IntrinsicCandidate
|
|
public native boolean isArray();
|
|
|
|
|
|
/**
|
|
* Determines if the specified {@code Class} object represents a
|
|
* primitive type.
|
|
*
|
|
* <p> There are nine predefined {@code Class} objects to represent
|
|
* the eight primitive types and void. These are created by the Java
|
|
* Virtual Machine, and have the same names as the primitive types that
|
|
* they represent, namely {@code boolean}, {@code byte},
|
|
* {@code char}, {@code short}, {@code int},
|
|
* {@code long}, {@code float}, and {@code double}.
|
|
*
|
|
* <p> These objects may only be accessed via the following public static
|
|
* final variables, and are the only {@code Class} objects for which
|
|
* this method returns {@code true}.
|
|
*
|
|
* @return true if and only if this class represents a primitive type
|
|
*
|
|
* @see java.lang.Boolean#TYPE
|
|
* @see java.lang.Character#TYPE
|
|
* @see java.lang.Byte#TYPE
|
|
* @see java.lang.Short#TYPE
|
|
* @see java.lang.Integer#TYPE
|
|
* @see java.lang.Long#TYPE
|
|
* @see java.lang.Float#TYPE
|
|
* @see java.lang.Double#TYPE
|
|
* @see java.lang.Void#TYPE
|
|
* @since 1.1
|
|
*/
|
|
@IntrinsicCandidate
|
|
public native boolean isPrimitive();
|
|
|
|
/**
|
|
* Returns true if this {@code Class} object represents an annotation
|
|
* type. Note that if this method returns true, {@link #isInterface()}
|
|
* would also return true, as all annotation types are also interfaces.
|
|
*
|
|
* @return {@code true} if this {@code Class} object represents an annotation
|
|
* type; {@code false} otherwise
|
|
* @since 1.5
|
|
*/
|
|
public boolean isAnnotation() {
|
|
return (getModifiers() & ANNOTATION) != 0;
|
|
}
|
|
|
|
/**
|
|
* Returns {@code true} if and only if this class has the synthetic modifier
|
|
* bit set.
|
|
*
|
|
* @return {@code true} if and only if this class has the synthetic modifier bit set
|
|
* @jls 13.1 The Form of a Binary
|
|
* @jvms 4.1 The {@code ClassFile} Structure
|
|
* @since 1.5
|
|
*/
|
|
public boolean isSynthetic() {
|
|
return (getModifiers() & SYNTHETIC) != 0;
|
|
}
|
|
|
|
/**
|
|
* Returns the name of the entity (class, interface, array class,
|
|
* primitive type, or void) represented by this {@code Class} object.
|
|
*
|
|
* <p> If this {@code Class} object represents a class or interface,
|
|
* not an array class, then:
|
|
* <ul>
|
|
* <li> If the class or interface is not {@linkplain #isHidden() hidden},
|
|
* then the <a href="ClassLoader.html#binary-name">binary name</a>
|
|
* of the class or interface is returned.
|
|
* <li> If the class or interface is hidden, then the result is a string
|
|
* of the form: {@code N + '/' + <suffix>}
|
|
* where {@code N} is the <a href="ClassLoader.html#binary-name">binary name</a>
|
|
* indicated by the {@code class} file passed to
|
|
* {@link java.lang.invoke.MethodHandles.Lookup#defineHiddenClass(byte[], boolean, MethodHandles.Lookup.ClassOption...)
|
|
* Lookup::defineHiddenClass}, and {@code <suffix>} is an unqualified name.
|
|
* </ul>
|
|
*
|
|
* <p> If this {@code Class} object represents an array class, then
|
|
* the result is a string consisting of one or more '{@code [}' characters
|
|
* representing the depth of the array nesting, followed by the element
|
|
* type as encoded using the following table:
|
|
*
|
|
* <blockquote><table class="striped">
|
|
* <caption style="display:none">Element types and encodings</caption>
|
|
* <thead>
|
|
* <tr><th scope="col"> Element Type <th scope="col"> Encoding
|
|
* </thead>
|
|
* <tbody style="text-align:left">
|
|
* <tr><th scope="row"> {@code boolean} <td style="text-align:center"> {@code Z}
|
|
* <tr><th scope="row"> {@code byte} <td style="text-align:center"> {@code B}
|
|
* <tr><th scope="row"> {@code char} <td style="text-align:center"> {@code C}
|
|
* <tr><th scope="row"> class or interface with <a href="ClassLoader.html#binary-name">binary name</a> <i>N</i>
|
|
* <td style="text-align:center"> {@code L}<em>N</em>{@code ;}
|
|
* <tr><th scope="row"> {@code double} <td style="text-align:center"> {@code D}
|
|
* <tr><th scope="row"> {@code float} <td style="text-align:center"> {@code F}
|
|
* <tr><th scope="row"> {@code int} <td style="text-align:center"> {@code I}
|
|
* <tr><th scope="row"> {@code long} <td style="text-align:center"> {@code J}
|
|
* <tr><th scope="row"> {@code short} <td style="text-align:center"> {@code S}
|
|
* </tbody>
|
|
* </table></blockquote>
|
|
*
|
|
* <p> If this {@code Class} object represents a primitive type or {@code void},
|
|
* then the result is a string with the same spelling as the Java language
|
|
* keyword which corresponds to the primitive type or {@code void}.
|
|
*
|
|
* <p> Examples:
|
|
* <blockquote><pre>
|
|
* String.class.getName()
|
|
* returns "java.lang.String"
|
|
* byte.class.getName()
|
|
* returns "byte"
|
|
* (new Object[3]).getClass().getName()
|
|
* returns "[Ljava.lang.Object;"
|
|
* (new int[3][4][5][6][7][8][9]).getClass().getName()
|
|
* returns "[[[[[[[I"
|
|
* </pre></blockquote>
|
|
*
|
|
* @return the name of the class, interface, or other entity
|
|
* represented by this {@code Class} object.
|
|
* @jls 13.1 The Form of a Binary
|
|
*/
|
|
public String getName() {
|
|
String name = this.name;
|
|
return name != null ? name : initClassName();
|
|
}
|
|
|
|
// Cache the name to reduce the number of calls into the VM.
|
|
// This field would be set by VM itself during initClassName call.
|
|
private transient String name;
|
|
private native String initClassName();
|
|
|
|
/**
|
|
* Returns the class loader for the class. Some implementations may use
|
|
* null to represent the bootstrap class loader. This method will return
|
|
* null in such implementations if this class was loaded by the bootstrap
|
|
* class loader.
|
|
*
|
|
* <p>If this {@code Class} object
|
|
* represents a primitive type or void, null is returned.
|
|
*
|
|
* @return the class loader that loaded the class or interface
|
|
* represented by this {@code Class} object.
|
|
* @throws SecurityException
|
|
* if a security manager is present, and the caller's class loader
|
|
* is not {@code null} and is not the same as or an ancestor of the
|
|
* class loader for the class whose class loader is requested,
|
|
* and the caller does not have the
|
|
* {@link RuntimePermission}{@code ("getClassLoader")}
|
|
* @see java.lang.ClassLoader
|
|
* @see SecurityManager#checkPermission
|
|
* @see java.lang.RuntimePermission
|
|
*/
|
|
@CallerSensitive
|
|
@ForceInline // to ensure Reflection.getCallerClass optimization
|
|
public ClassLoader getClassLoader() {
|
|
ClassLoader cl = getClassLoader0();
|
|
if (cl == null)
|
|
return null;
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
ClassLoader.checkClassLoaderPermission(cl, Reflection.getCallerClass());
|
|
}
|
|
return cl;
|
|
}
|
|
|
|
// Package-private to allow ClassLoader access
|
|
ClassLoader getClassLoader0() { return classLoader; }
|
|
|
|
/**
|
|
* Returns the module that this class or interface is a member of.
|
|
*
|
|
* If this class represents an array type then this method returns the
|
|
* {@code Module} for the element type. If this class represents a
|
|
* primitive type or void, then the {@code Module} object for the
|
|
* {@code java.base} module is returned.
|
|
*
|
|
* If this class is in an unnamed module then the {@linkplain
|
|
* ClassLoader#getUnnamedModule() unnamed} {@code Module} of the class
|
|
* loader for this class is returned.
|
|
*
|
|
* @return the module that this class or interface is a member of
|
|
*
|
|
* @since 9
|
|
*/
|
|
public Module getModule() {
|
|
return module;
|
|
}
|
|
|
|
// set by VM
|
|
private transient Module module;
|
|
|
|
// Initialized in JVM not by private constructor
|
|
// This field is filtered from reflection access, i.e. getDeclaredField
|
|
// will throw NoSuchFieldException
|
|
private final ClassLoader classLoader;
|
|
|
|
// Set by VM
|
|
private transient Object classData;
|
|
|
|
// package-private
|
|
Object getClassData() {
|
|
return classData;
|
|
}
|
|
|
|
/**
|
|
* Returns an array of {@code TypeVariable} objects that represent the
|
|
* type variables declared by the generic declaration represented by this
|
|
* {@code GenericDeclaration} object, in declaration order. Returns an
|
|
* array of length 0 if the underlying generic declaration declares no type
|
|
* variables.
|
|
*
|
|
* @return an array of {@code TypeVariable} objects that represent
|
|
* the type variables declared by this generic declaration
|
|
* @throws java.lang.reflect.GenericSignatureFormatError if the generic
|
|
* signature of this generic declaration does not conform to
|
|
* the format specified in section {@jvms 4.7.9} of
|
|
* <cite>The Java Virtual Machine Specification</cite>
|
|
* @since 1.5
|
|
*/
|
|
@SuppressWarnings("unchecked")
|
|
public TypeVariable<Class<T>>[] getTypeParameters() {
|
|
ClassRepository info = getGenericInfo();
|
|
if (info != null)
|
|
return (TypeVariable<Class<T>>[])info.getTypeParameters();
|
|
else
|
|
return (TypeVariable<Class<T>>[])new TypeVariable<?>[0];
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns the {@code Class} representing the direct superclass of the
|
|
* entity (class, interface, primitive type or void) represented by
|
|
* this {@code Class}. If this {@code Class} represents either the
|
|
* {@code Object} class, an interface, a primitive type, or void, then
|
|
* null is returned. If this {@code Class} object represents an array class
|
|
* then the {@code Class} object representing the {@code Object} class is
|
|
* returned.
|
|
*
|
|
* @return the direct superclass of the class represented by this {@code Class} object
|
|
*/
|
|
@IntrinsicCandidate
|
|
public native Class<? super T> getSuperclass();
|
|
|
|
|
|
/**
|
|
* Returns the {@code Type} representing the direct superclass of
|
|
* the entity (class, interface, primitive type or void) represented by
|
|
* this {@code Class} object.
|
|
*
|
|
* <p>If the superclass is a parameterized type, the {@code Type}
|
|
* object returned must accurately reflect the actual type
|
|
* arguments used in the source code. The parameterized type
|
|
* representing the superclass is created if it had not been
|
|
* created before. See the declaration of {@link
|
|
* java.lang.reflect.ParameterizedType ParameterizedType} for the
|
|
* semantics of the creation process for parameterized types. If
|
|
* this {@code Class} object represents either the {@code Object}
|
|
* class, an interface, a primitive type, or void, then null is
|
|
* returned. If this {@code Class} object represents an array class
|
|
* then the {@code Class} object representing the {@code Object} class is
|
|
* returned.
|
|
*
|
|
* @throws java.lang.reflect.GenericSignatureFormatError if the generic
|
|
* class signature does not conform to the format specified in
|
|
* section {@jvms 4.7.9} of <cite>The Java Virtual
|
|
* Machine Specification</cite>
|
|
* @throws TypeNotPresentException if the generic superclass
|
|
* refers to a non-existent type declaration
|
|
* @throws java.lang.reflect.MalformedParameterizedTypeException if the
|
|
* generic superclass refers to a parameterized type that cannot be
|
|
* instantiated for any reason
|
|
* @return the direct superclass of the class represented by this {@code Class} object
|
|
* @since 1.5
|
|
*/
|
|
public Type getGenericSuperclass() {
|
|
ClassRepository info = getGenericInfo();
|
|
if (info == null) {
|
|
return getSuperclass();
|
|
}
|
|
|
|
// Historical irregularity:
|
|
// Generic signature marks interfaces with superclass = Object
|
|
// but this API returns null for interfaces
|
|
if (isInterface()) {
|
|
return null;
|
|
}
|
|
|
|
return info.getSuperclass();
|
|
}
|
|
|
|
/**
|
|
* Gets the package of this class.
|
|
*
|
|
* <p>If this class represents an array type, a primitive type or void,
|
|
* this method returns {@code null}.
|
|
*
|
|
* @return the package of this class.
|
|
* @revised 9
|
|
*/
|
|
public Package getPackage() {
|
|
if (isPrimitive() || isArray()) {
|
|
return null;
|
|
}
|
|
ClassLoader cl = getClassLoader0();
|
|
return cl != null ? cl.definePackage(this)
|
|
: BootLoader.definePackage(this);
|
|
}
|
|
|
|
/**
|
|
* Returns the fully qualified package name.
|
|
*
|
|
* <p> If this class is a top level class, then this method returns the fully
|
|
* qualified name of the package that the class is a member of, or the
|
|
* empty string if the class is in an unnamed package.
|
|
*
|
|
* <p> If this class is a member class, then this method is equivalent to
|
|
* invoking {@code getPackageName()} on the {@linkplain #getEnclosingClass
|
|
* enclosing class}.
|
|
*
|
|
* <p> If this class is a {@linkplain #isLocalClass local class} or an {@linkplain
|
|
* #isAnonymousClass() anonymous class}, then this method is equivalent to
|
|
* invoking {@code getPackageName()} on the {@linkplain #getDeclaringClass
|
|
* declaring class} of the {@linkplain #getEnclosingMethod enclosing method} or
|
|
* {@linkplain #getEnclosingConstructor enclosing constructor}.
|
|
*
|
|
* <p> If this class represents an array type then this method returns the
|
|
* package name of the element type. If this class represents a primitive
|
|
* type or void then the package name "{@code java.lang}" is returned.
|
|
*
|
|
* @return the fully qualified package name
|
|
*
|
|
* @since 9
|
|
* @jls 6.7 Fully Qualified Names
|
|
*/
|
|
public String getPackageName() {
|
|
String pn = this.packageName;
|
|
if (pn == null) {
|
|
Class<?> c = isArray() ? elementType() : this;
|
|
if (c.isPrimitive()) {
|
|
pn = "java.lang";
|
|
} else {
|
|
String cn = c.getName();
|
|
int dot = cn.lastIndexOf('.');
|
|
pn = (dot != -1) ? cn.substring(0, dot).intern() : "";
|
|
}
|
|
this.packageName = pn;
|
|
}
|
|
return pn;
|
|
}
|
|
|
|
// cached package name
|
|
private transient String packageName;
|
|
|
|
/**
|
|
* Returns the interfaces directly implemented by the class or interface
|
|
* represented by this {@code Class} object.
|
|
*
|
|
* <p>If this {@code Class} object represents a class, the return value is an array
|
|
* containing objects representing all interfaces directly implemented by
|
|
* the class. The order of the interface objects in the array corresponds
|
|
* to the order of the interface names in the {@code implements} clause of
|
|
* the declaration of the class represented by this {@code Class} object. For example,
|
|
* given the declaration:
|
|
* <blockquote>
|
|
* {@code class Shimmer implements FloorWax, DessertTopping { ... }}
|
|
* </blockquote>
|
|
* suppose the value of {@code s} is an instance of
|
|
* {@code Shimmer}; the value of the expression:
|
|
* <blockquote>
|
|
* {@code s.getClass().getInterfaces()[0]}
|
|
* </blockquote>
|
|
* is the {@code Class} object that represents interface
|
|
* {@code FloorWax}; and the value of:
|
|
* <blockquote>
|
|
* {@code s.getClass().getInterfaces()[1]}
|
|
* </blockquote>
|
|
* is the {@code Class} object that represents interface
|
|
* {@code DessertTopping}.
|
|
*
|
|
* <p>If this {@code Class} object represents an interface, the array contains objects
|
|
* representing all interfaces directly extended by the interface. The
|
|
* order of the interface objects in the array corresponds to the order of
|
|
* the interface names in the {@code extends} clause of the declaration of
|
|
* the interface represented by this {@code Class} object.
|
|
*
|
|
* <p>If this {@code Class} object represents a class or interface that implements no
|
|
* interfaces, the method returns an array of length 0.
|
|
*
|
|
* <p>If this {@code Class} object represents a primitive type or void, the method
|
|
* returns an array of length 0.
|
|
*
|
|
* <p>If this {@code Class} object represents an array type, the
|
|
* interfaces {@code Cloneable} and {@code java.io.Serializable} are
|
|
* returned in that order.
|
|
*
|
|
* @return an array of interfaces directly implemented by this class
|
|
*/
|
|
public Class<?>[] getInterfaces() {
|
|
// defensively copy before handing over to user code
|
|
return getInterfaces(true);
|
|
}
|
|
|
|
private Class<?>[] getInterfaces(boolean cloneArray) {
|
|
ReflectionData<T> rd = reflectionData();
|
|
if (rd == null) {
|
|
// no cloning required
|
|
return getInterfaces0();
|
|
} else {
|
|
Class<?>[] interfaces = rd.interfaces;
|
|
if (interfaces == null) {
|
|
interfaces = getInterfaces0();
|
|
rd.interfaces = interfaces;
|
|
}
|
|
// defensively copy if requested
|
|
return cloneArray ? interfaces.clone() : interfaces;
|
|
}
|
|
}
|
|
|
|
private native Class<?>[] getInterfaces0();
|
|
|
|
/**
|
|
* Returns the {@code Type}s representing the interfaces
|
|
* directly implemented by the class or interface represented by
|
|
* this {@code Class} object.
|
|
*
|
|
* <p>If a superinterface is a parameterized type, the
|
|
* {@code Type} object returned for it must accurately reflect
|
|
* the actual type arguments used in the source code. The
|
|
* parameterized type representing each superinterface is created
|
|
* if it had not been created before. See the declaration of
|
|
* {@link java.lang.reflect.ParameterizedType ParameterizedType}
|
|
* for the semantics of the creation process for parameterized
|
|
* types.
|
|
*
|
|
* <p>If this {@code Class} object represents a class, the return value is an array
|
|
* containing objects representing all interfaces directly implemented by
|
|
* the class. The order of the interface objects in the array corresponds
|
|
* to the order of the interface names in the {@code implements} clause of
|
|
* the declaration of the class represented by this {@code Class} object.
|
|
*
|
|
* <p>If this {@code Class} object represents an interface, the array contains objects
|
|
* representing all interfaces directly extended by the interface. The
|
|
* order of the interface objects in the array corresponds to the order of
|
|
* the interface names in the {@code extends} clause of the declaration of
|
|
* the interface represented by this {@code Class} object.
|
|
*
|
|
* <p>If this {@code Class} object represents a class or interface that implements no
|
|
* interfaces, the method returns an array of length 0.
|
|
*
|
|
* <p>If this {@code Class} object represents a primitive type or void, the method
|
|
* returns an array of length 0.
|
|
*
|
|
* <p>If this {@code Class} object represents an array type, the
|
|
* interfaces {@code Cloneable} and {@code java.io.Serializable} are
|
|
* returned in that order.
|
|
*
|
|
* @throws java.lang.reflect.GenericSignatureFormatError
|
|
* if the generic class signature does not conform to the
|
|
* format specified in section {@jvms 4.7.9} of <cite>The
|
|
* Java Virtual Machine Specification</cite>
|
|
* @throws TypeNotPresentException if any of the generic
|
|
* superinterfaces refers to a non-existent type declaration
|
|
* @throws java.lang.reflect.MalformedParameterizedTypeException
|
|
* if any of the generic superinterfaces refer to a parameterized
|
|
* type that cannot be instantiated for any reason
|
|
* @return an array of interfaces directly implemented by this class
|
|
* @since 1.5
|
|
*/
|
|
public Type[] getGenericInterfaces() {
|
|
ClassRepository info = getGenericInfo();
|
|
return (info == null) ? getInterfaces() : info.getSuperInterfaces();
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns the {@code Class} representing the component type of an
|
|
* array. If this class does not represent an array class this method
|
|
* returns null.
|
|
*
|
|
* @return the {@code Class} representing the component type of this
|
|
* class if this class is an array
|
|
* @see java.lang.reflect.Array
|
|
* @since 1.1
|
|
*/
|
|
public Class<?> getComponentType() {
|
|
// Only return for array types. Storage may be reused for Class for instance types.
|
|
if (isArray()) {
|
|
return componentType;
|
|
} else {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
private final Class<?> componentType;
|
|
|
|
/*
|
|
* Returns the {@code Class} representing the element type of an array class.
|
|
* If this class does not represent an array class, then this method returns
|
|
* {@code null}.
|
|
*/
|
|
private Class<?> elementType() {
|
|
if (!isArray()) return null;
|
|
|
|
Class<?> c = this;
|
|
while (c.isArray()) {
|
|
c = c.getComponentType();
|
|
}
|
|
return c;
|
|
}
|
|
|
|
/**
|
|
* Returns the Java language modifiers for this class or interface, encoded
|
|
* in an integer. The modifiers consist of the Java Virtual Machine's
|
|
* constants for {@code public}, {@code protected},
|
|
* {@code private}, {@code final}, {@code static},
|
|
* {@code abstract} and {@code interface}; they should be decoded
|
|
* using the methods of class {@code Modifier}.
|
|
*
|
|
* <p> If the underlying class is an array class, then its
|
|
* {@code public}, {@code private} and {@code protected}
|
|
* modifiers are the same as those of its component type. If this
|
|
* {@code Class} object represents a primitive type or void, its
|
|
* {@code public} modifier is always {@code true}, and its
|
|
* {@code protected} and {@code private} modifiers are always
|
|
* {@code false}. If this {@code Class} object represents an array class, a
|
|
* primitive type or void, then its {@code final} modifier is always
|
|
* {@code true} and its interface modifier is always
|
|
* {@code false}. The values of its other modifiers are not determined
|
|
* by this specification.
|
|
*
|
|
* <p> The modifier encodings are defined in section {@jvms 4.1}
|
|
* of <cite>The Java Virtual Machine Specification</cite>.
|
|
*
|
|
* @return the {@code int} representing the modifiers for this class
|
|
* @see java.lang.reflect.Modifier
|
|
* @since 1.1
|
|
*/
|
|
@IntrinsicCandidate
|
|
public native int getModifiers();
|
|
|
|
|
|
/**
|
|
* Gets the signers of this class.
|
|
*
|
|
* @return the signers of this class, or null if there are no signers. In
|
|
* particular, this method returns null if this {@code Class} object represents
|
|
* a primitive type or void.
|
|
* @since 1.1
|
|
*/
|
|
public native Object[] getSigners();
|
|
|
|
|
|
/**
|
|
* Set the signers of this class.
|
|
*/
|
|
native void setSigners(Object[] signers);
|
|
|
|
|
|
/**
|
|
* If this {@code Class} object represents a local or anonymous
|
|
* class within a method, returns a {@link
|
|
* java.lang.reflect.Method Method} object representing the
|
|
* immediately enclosing method of the underlying class. Returns
|
|
* {@code null} otherwise.
|
|
*
|
|
* In particular, this method returns {@code null} if the underlying
|
|
* class is a local or anonymous class immediately enclosed by a type
|
|
* declaration, instance initializer or static initializer.
|
|
*
|
|
* @return the immediately enclosing method of the underlying class, if
|
|
* that class is a local or anonymous class; otherwise {@code null}.
|
|
*
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and any of the
|
|
* following conditions is met:
|
|
*
|
|
* <ul>
|
|
*
|
|
* <li> the caller's class loader is not the same as the
|
|
* class loader of the enclosing class and invocation of
|
|
* {@link SecurityManager#checkPermission
|
|
* s.checkPermission} method with
|
|
* {@code RuntimePermission("accessDeclaredMembers")}
|
|
* denies access to the methods within the enclosing class
|
|
*
|
|
* <li> the caller's class loader is not the same as or an
|
|
* ancestor of the class loader for the enclosing class and
|
|
* invocation of {@link SecurityManager#checkPackageAccess
|
|
* s.checkPackageAccess()} denies access to the package
|
|
* of the enclosing class
|
|
*
|
|
* </ul>
|
|
* @since 1.5
|
|
*/
|
|
@CallerSensitive
|
|
public Method getEnclosingMethod() throws SecurityException {
|
|
EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
|
|
|
|
if (enclosingInfo == null)
|
|
return null;
|
|
else {
|
|
if (!enclosingInfo.isMethod())
|
|
return null;
|
|
|
|
MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(),
|
|
getFactory());
|
|
Class<?> returnType = toClass(typeInfo.getReturnType());
|
|
Type [] parameterTypes = typeInfo.getParameterTypes();
|
|
Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
|
|
|
|
// Convert Types to Classes; returned types *should*
|
|
// be class objects since the methodDescriptor's used
|
|
// don't have generics information
|
|
for(int i = 0; i < parameterClasses.length; i++)
|
|
parameterClasses[i] = toClass(parameterTypes[i]);
|
|
|
|
// Perform access check
|
|
final Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass();
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
enclosingCandidate.checkMemberAccess(sm, Member.DECLARED,
|
|
Reflection.getCallerClass(), true);
|
|
}
|
|
Method[] candidates = enclosingCandidate.privateGetDeclaredMethods(false);
|
|
|
|
/*
|
|
* Loop over all declared methods; match method name,
|
|
* number of and type of parameters, *and* return
|
|
* type. Matching return type is also necessary
|
|
* because of covariant returns, etc.
|
|
*/
|
|
ReflectionFactory fact = getReflectionFactory();
|
|
for (Method m : candidates) {
|
|
if (m.getName().equals(enclosingInfo.getName()) &&
|
|
arrayContentsEq(parameterClasses,
|
|
fact.getExecutableSharedParameterTypes(m))) {
|
|
// finally, check return type
|
|
if (m.getReturnType().equals(returnType)) {
|
|
return fact.copyMethod(m);
|
|
}
|
|
}
|
|
}
|
|
|
|
throw new InternalError("Enclosing method not found");
|
|
}
|
|
}
|
|
|
|
private native Object[] getEnclosingMethod0();
|
|
|
|
private EnclosingMethodInfo getEnclosingMethodInfo() {
|
|
Object[] enclosingInfo = getEnclosingMethod0();
|
|
if (enclosingInfo == null)
|
|
return null;
|
|
else {
|
|
return new EnclosingMethodInfo(enclosingInfo);
|
|
}
|
|
}
|
|
|
|
private static final class EnclosingMethodInfo {
|
|
private final Class<?> enclosingClass;
|
|
private final String name;
|
|
private final String descriptor;
|
|
|
|
static void validate(Object[] enclosingInfo) {
|
|
if (enclosingInfo.length != 3)
|
|
throw new InternalError("Malformed enclosing method information");
|
|
try {
|
|
// The array is expected to have three elements:
|
|
|
|
// the immediately enclosing class
|
|
Class<?> enclosingClass = (Class<?>)enclosingInfo[0];
|
|
assert(enclosingClass != null);
|
|
|
|
// the immediately enclosing method or constructor's
|
|
// name (can be null).
|
|
String name = (String)enclosingInfo[1];
|
|
|
|
// the immediately enclosing method or constructor's
|
|
// descriptor (null iff name is).
|
|
String descriptor = (String)enclosingInfo[2];
|
|
assert((name != null && descriptor != null) || name == descriptor);
|
|
} catch (ClassCastException cce) {
|
|
throw new InternalError("Invalid type in enclosing method information", cce);
|
|
}
|
|
}
|
|
|
|
EnclosingMethodInfo(Object[] enclosingInfo) {
|
|
validate(enclosingInfo);
|
|
this.enclosingClass = (Class<?>)enclosingInfo[0];
|
|
this.name = (String)enclosingInfo[1];
|
|
this.descriptor = (String)enclosingInfo[2];
|
|
}
|
|
|
|
boolean isPartial() {
|
|
return enclosingClass == null || name == null || descriptor == null;
|
|
}
|
|
|
|
boolean isConstructor() { return !isPartial() && "<init>".equals(name); }
|
|
|
|
boolean isMethod() { return !isPartial() && !isConstructor() && !"<clinit>".equals(name); }
|
|
|
|
Class<?> getEnclosingClass() { return enclosingClass; }
|
|
|
|
String getName() { return name; }
|
|
|
|
String getDescriptor() { return descriptor; }
|
|
|
|
}
|
|
|
|
private static Class<?> toClass(Type o) {
|
|
if (o instanceof GenericArrayType)
|
|
return Array.newInstance(toClass(((GenericArrayType)o).getGenericComponentType()),
|
|
0)
|
|
.getClass();
|
|
return (Class<?>)o;
|
|
}
|
|
|
|
/**
|
|
* If this {@code Class} object represents a local or anonymous
|
|
* class within a constructor, returns a {@link
|
|
* java.lang.reflect.Constructor Constructor} object representing
|
|
* the immediately enclosing constructor of the underlying
|
|
* class. Returns {@code null} otherwise. In particular, this
|
|
* method returns {@code null} if the underlying class is a local
|
|
* or anonymous class immediately enclosed by a type declaration,
|
|
* instance initializer or static initializer.
|
|
*
|
|
* @return the immediately enclosing constructor of the underlying class, if
|
|
* that class is a local or anonymous class; otherwise {@code null}.
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and any of the
|
|
* following conditions is met:
|
|
*
|
|
* <ul>
|
|
*
|
|
* <li> the caller's class loader is not the same as the
|
|
* class loader of the enclosing class and invocation of
|
|
* {@link SecurityManager#checkPermission
|
|
* s.checkPermission} method with
|
|
* {@code RuntimePermission("accessDeclaredMembers")}
|
|
* denies access to the constructors within the enclosing class
|
|
*
|
|
* <li> the caller's class loader is not the same as or an
|
|
* ancestor of the class loader for the enclosing class and
|
|
* invocation of {@link SecurityManager#checkPackageAccess
|
|
* s.checkPackageAccess()} denies access to the package
|
|
* of the enclosing class
|
|
*
|
|
* </ul>
|
|
* @since 1.5
|
|
*/
|
|
@CallerSensitive
|
|
public Constructor<?> getEnclosingConstructor() throws SecurityException {
|
|
EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
|
|
|
|
if (enclosingInfo == null)
|
|
return null;
|
|
else {
|
|
if (!enclosingInfo.isConstructor())
|
|
return null;
|
|
|
|
ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(),
|
|
getFactory());
|
|
Type [] parameterTypes = typeInfo.getParameterTypes();
|
|
Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
|
|
|
|
// Convert Types to Classes; returned types *should*
|
|
// be class objects since the methodDescriptor's used
|
|
// don't have generics information
|
|
for(int i = 0; i < parameterClasses.length; i++)
|
|
parameterClasses[i] = toClass(parameterTypes[i]);
|
|
|
|
// Perform access check
|
|
final Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass();
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
enclosingCandidate.checkMemberAccess(sm, Member.DECLARED,
|
|
Reflection.getCallerClass(), true);
|
|
}
|
|
|
|
Constructor<?>[] candidates = enclosingCandidate
|
|
.privateGetDeclaredConstructors(false);
|
|
/*
|
|
* Loop over all declared constructors; match number
|
|
* of and type of parameters.
|
|
*/
|
|
ReflectionFactory fact = getReflectionFactory();
|
|
for (Constructor<?> c : candidates) {
|
|
if (arrayContentsEq(parameterClasses,
|
|
fact.getExecutableSharedParameterTypes(c))) {
|
|
return fact.copyConstructor(c);
|
|
}
|
|
}
|
|
|
|
throw new InternalError("Enclosing constructor not found");
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* If the class or interface represented by this {@code Class} object
|
|
* is a member of another class, returns the {@code Class} object
|
|
* representing the class in which it was declared. This method returns
|
|
* null if this class or interface is not a member of any other class. If
|
|
* this {@code Class} object represents an array class, a primitive
|
|
* type, or void,then this method returns null.
|
|
*
|
|
* @return the declaring class for this class
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and the caller's
|
|
* class loader is not the same as or an ancestor of the class
|
|
* loader for the declaring class and invocation of {@link
|
|
* SecurityManager#checkPackageAccess s.checkPackageAccess()}
|
|
* denies access to the package of the declaring class
|
|
* @since 1.1
|
|
*/
|
|
@CallerSensitive
|
|
public Class<?> getDeclaringClass() throws SecurityException {
|
|
final Class<?> candidate = getDeclaringClass0();
|
|
|
|
if (candidate != null) {
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
candidate.checkPackageAccess(sm,
|
|
ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
|
|
}
|
|
}
|
|
return candidate;
|
|
}
|
|
|
|
private native Class<?> getDeclaringClass0();
|
|
|
|
|
|
/**
|
|
* Returns the immediately enclosing class of the underlying
|
|
* class. If the underlying class is a top level class this
|
|
* method returns {@code null}.
|
|
* @return the immediately enclosing class of the underlying class
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and the caller's
|
|
* class loader is not the same as or an ancestor of the class
|
|
* loader for the enclosing class and invocation of {@link
|
|
* SecurityManager#checkPackageAccess s.checkPackageAccess()}
|
|
* denies access to the package of the enclosing class
|
|
* @since 1.5
|
|
*/
|
|
@CallerSensitive
|
|
public Class<?> getEnclosingClass() throws SecurityException {
|
|
// There are five kinds of classes (or interfaces):
|
|
// a) Top level classes
|
|
// b) Nested classes (static member classes)
|
|
// c) Inner classes (non-static member classes)
|
|
// d) Local classes (named classes declared within a method)
|
|
// e) Anonymous classes
|
|
|
|
|
|
// JVM Spec 4.7.7: A class must have an EnclosingMethod
|
|
// attribute if and only if it is a local class or an
|
|
// anonymous class.
|
|
EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
|
|
Class<?> enclosingCandidate;
|
|
|
|
if (enclosingInfo == null) {
|
|
// This is a top level or a nested class or an inner class (a, b, or c)
|
|
enclosingCandidate = getDeclaringClass0();
|
|
} else {
|
|
Class<?> enclosingClass = enclosingInfo.getEnclosingClass();
|
|
// This is a local class or an anonymous class (d or e)
|
|
if (enclosingClass == this || enclosingClass == null)
|
|
throw new InternalError("Malformed enclosing method information");
|
|
else
|
|
enclosingCandidate = enclosingClass;
|
|
}
|
|
|
|
if (enclosingCandidate != null) {
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
enclosingCandidate.checkPackageAccess(sm,
|
|
ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
|
|
}
|
|
}
|
|
return enclosingCandidate;
|
|
}
|
|
|
|
/**
|
|
* Returns the simple name of the underlying class as given in the
|
|
* source code. Returns an empty string if the underlying class is
|
|
* anonymous.
|
|
*
|
|
* <p>The simple name of an array is the simple name of the
|
|
* component type with "[]" appended. In particular the simple
|
|
* name of an array whose component type is anonymous is "[]".
|
|
*
|
|
* @return the simple name of the underlying class
|
|
* @since 1.5
|
|
*/
|
|
public String getSimpleName() {
|
|
ReflectionData<T> rd = reflectionData();
|
|
String simpleName = rd.simpleName;
|
|
if (simpleName == null) {
|
|
rd.simpleName = simpleName = getSimpleName0();
|
|
}
|
|
return simpleName;
|
|
}
|
|
|
|
private String getSimpleName0() {
|
|
if (isArray()) {
|
|
return getComponentType().getSimpleName() + "[]";
|
|
}
|
|
String simpleName = getSimpleBinaryName();
|
|
if (simpleName == null) { // top level class
|
|
simpleName = getName();
|
|
simpleName = simpleName.substring(simpleName.lastIndexOf('.') + 1); // strip the package name
|
|
}
|
|
return simpleName;
|
|
}
|
|
|
|
/**
|
|
* Return an informative string for the name of this type.
|
|
*
|
|
* @return an informative string for the name of this type
|
|
* @since 1.8
|
|
*/
|
|
public String getTypeName() {
|
|
if (isArray()) {
|
|
try {
|
|
Class<?> cl = this;
|
|
int dimensions = 0;
|
|
do {
|
|
dimensions++;
|
|
cl = cl.getComponentType();
|
|
} while (cl.isArray());
|
|
return cl.getName() + "[]".repeat(dimensions);
|
|
} catch (Throwable e) { /*FALLTHRU*/ }
|
|
}
|
|
return getName();
|
|
}
|
|
|
|
/**
|
|
* Returns the canonical name of the underlying class as
|
|
* defined by <cite>The Java Language Specification</cite>.
|
|
* Returns {@code null} if the underlying class does not have a canonical
|
|
* name. Classes without canonical names include:
|
|
* <ul>
|
|
* <li>a {@linkplain #isLocalClass() local class}
|
|
* <li>a {@linkplain #isAnonymousClass() anonymous class}
|
|
* <li>a {@linkplain #isHidden() hidden class}
|
|
* <li>an array whose component type does not have a canonical name</li>
|
|
* </ul>
|
|
*
|
|
* @return the canonical name of the underlying class if it exists, and
|
|
* {@code null} otherwise.
|
|
* @since 1.5
|
|
*/
|
|
public String getCanonicalName() {
|
|
ReflectionData<T> rd = reflectionData();
|
|
String canonicalName = rd.canonicalName;
|
|
if (canonicalName == null) {
|
|
rd.canonicalName = canonicalName = getCanonicalName0();
|
|
}
|
|
return canonicalName == ReflectionData.NULL_SENTINEL? null : canonicalName;
|
|
}
|
|
|
|
private String getCanonicalName0() {
|
|
if (isArray()) {
|
|
String canonicalName = getComponentType().getCanonicalName();
|
|
if (canonicalName != null)
|
|
return canonicalName + "[]";
|
|
else
|
|
return ReflectionData.NULL_SENTINEL;
|
|
}
|
|
if (isHidden() || isLocalOrAnonymousClass())
|
|
return ReflectionData.NULL_SENTINEL;
|
|
Class<?> enclosingClass = getEnclosingClass();
|
|
if (enclosingClass == null) { // top level class
|
|
return getName();
|
|
} else {
|
|
String enclosingName = enclosingClass.getCanonicalName();
|
|
if (enclosingName == null)
|
|
return ReflectionData.NULL_SENTINEL;
|
|
return enclosingName + "." + getSimpleName();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns {@code true} if and only if the underlying class
|
|
* is an anonymous class.
|
|
*
|
|
* @apiNote
|
|
* An anonymous class is not a {@linkplain #isHidden() hidden class}.
|
|
*
|
|
* @return {@code true} if and only if this class is an anonymous class.
|
|
* @since 1.5
|
|
*/
|
|
public boolean isAnonymousClass() {
|
|
return !isArray() && isLocalOrAnonymousClass() &&
|
|
getSimpleBinaryName0() == null;
|
|
}
|
|
|
|
/**
|
|
* Returns {@code true} if and only if the underlying class
|
|
* is a local class.
|
|
*
|
|
* @return {@code true} if and only if this class is a local class.
|
|
* @since 1.5
|
|
*/
|
|
public boolean isLocalClass() {
|
|
return isLocalOrAnonymousClass() &&
|
|
(isArray() || getSimpleBinaryName0() != null);
|
|
}
|
|
|
|
/**
|
|
* Returns {@code true} if and only if the underlying class
|
|
* is a member class.
|
|
*
|
|
* @return {@code true} if and only if this class is a member class.
|
|
* @since 1.5
|
|
*/
|
|
public boolean isMemberClass() {
|
|
return !isLocalOrAnonymousClass() && getDeclaringClass0() != null;
|
|
}
|
|
|
|
/**
|
|
* Returns the "simple binary name" of the underlying class, i.e.,
|
|
* the binary name without the leading enclosing class name.
|
|
* Returns {@code null} if the underlying class is a top level
|
|
* class.
|
|
*/
|
|
private String getSimpleBinaryName() {
|
|
if (isTopLevelClass())
|
|
return null;
|
|
String name = getSimpleBinaryName0();
|
|
if (name == null) // anonymous class
|
|
return "";
|
|
return name;
|
|
}
|
|
|
|
private native String getSimpleBinaryName0();
|
|
|
|
/**
|
|
* Returns {@code true} if this is a top level class. Returns {@code false}
|
|
* otherwise.
|
|
*/
|
|
private boolean isTopLevelClass() {
|
|
return !isLocalOrAnonymousClass() && getDeclaringClass0() == null;
|
|
}
|
|
|
|
/**
|
|
* Returns {@code true} if this is a local class or an anonymous
|
|
* class. Returns {@code false} otherwise.
|
|
*/
|
|
private boolean isLocalOrAnonymousClass() {
|
|
// JVM Spec 4.7.7: A class must have an EnclosingMethod
|
|
// attribute if and only if it is a local class or an
|
|
// anonymous class.
|
|
return hasEnclosingMethodInfo();
|
|
}
|
|
|
|
private boolean hasEnclosingMethodInfo() {
|
|
Object[] enclosingInfo = getEnclosingMethod0();
|
|
if (enclosingInfo != null) {
|
|
EnclosingMethodInfo.validate(enclosingInfo);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Returns an array containing {@code Class} objects representing all
|
|
* the public classes and interfaces that are members of the class
|
|
* represented by this {@code Class} object. This includes public
|
|
* class and interface members inherited from superclasses and public class
|
|
* and interface members declared by the class. This method returns an
|
|
* array of length 0 if this {@code Class} object has no public member
|
|
* classes or interfaces. This method also returns an array of length 0 if
|
|
* this {@code Class} object represents a primitive type, an array
|
|
* class, or void.
|
|
*
|
|
* @return the array of {@code Class} objects representing the public
|
|
* members of this class
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and
|
|
* the caller's class loader is not the same as or an
|
|
* ancestor of the class loader for the current class and
|
|
* invocation of {@link SecurityManager#checkPackageAccess
|
|
* s.checkPackageAccess()} denies access to the package
|
|
* of this class.
|
|
*
|
|
* @since 1.1
|
|
*/
|
|
@CallerSensitive
|
|
public Class<?>[] getClasses() {
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), false);
|
|
}
|
|
|
|
// Privileged so this implementation can look at DECLARED classes,
|
|
// something the caller might not have privilege to do. The code here
|
|
// is allowed to look at DECLARED classes because (1) it does not hand
|
|
// out anything other than public members and (2) public member access
|
|
// has already been ok'd by the SecurityManager.
|
|
|
|
return java.security.AccessController.doPrivileged(
|
|
new java.security.PrivilegedAction<>() {
|
|
public Class<?>[] run() {
|
|
List<Class<?>> list = new ArrayList<>();
|
|
Class<?> currentClass = Class.this;
|
|
while (currentClass != null) {
|
|
for (Class<?> m : currentClass.getDeclaredClasses()) {
|
|
if (Modifier.isPublic(m.getModifiers())) {
|
|
list.add(m);
|
|
}
|
|
}
|
|
currentClass = currentClass.getSuperclass();
|
|
}
|
|
return list.toArray(new Class<?>[0]);
|
|
}
|
|
});
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns an array containing {@code Field} objects reflecting all
|
|
* the accessible public fields of the class or interface represented by
|
|
* this {@code Class} object.
|
|
*
|
|
* <p> If this {@code Class} object represents a class or interface with
|
|
* no accessible public fields, then this method returns an array of length
|
|
* 0.
|
|
*
|
|
* <p> If this {@code Class} object represents a class, then this method
|
|
* returns the public fields of the class and of all its superclasses and
|
|
* superinterfaces.
|
|
*
|
|
* <p> If this {@code Class} object represents an interface, then this
|
|
* method returns the fields of the interface and of all its
|
|
* superinterfaces.
|
|
*
|
|
* <p> If this {@code Class} object represents an array type, a primitive
|
|
* type, or void, then this method returns an array of length 0.
|
|
*
|
|
* <p> The elements in the returned array are not sorted and are not in any
|
|
* particular order.
|
|
*
|
|
* @return the array of {@code Field} objects representing the
|
|
* public fields
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and
|
|
* the caller's class loader is not the same as or an
|
|
* ancestor of the class loader for the current class and
|
|
* invocation of {@link SecurityManager#checkPackageAccess
|
|
* s.checkPackageAccess()} denies access to the package
|
|
* of this class.
|
|
*
|
|
* @since 1.1
|
|
* @jls 8.2 Class Members
|
|
* @jls 8.3 Field Declarations
|
|
*/
|
|
@CallerSensitive
|
|
public Field[] getFields() throws SecurityException {
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
|
|
}
|
|
return copyFields(privateGetPublicFields());
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns an array containing {@code Method} objects reflecting all the
|
|
* public methods of the class or interface represented by this {@code
|
|
* Class} object, including those declared by the class or interface and
|
|
* those inherited from superclasses and superinterfaces.
|
|
*
|
|
* <p> If this {@code Class} object represents an array type, then the
|
|
* returned array has a {@code Method} object for each of the public
|
|
* methods inherited by the array type from {@code Object}. It does not
|
|
* contain a {@code Method} object for {@code clone()}.
|
|
*
|
|
* <p> If this {@code Class} object represents an interface then the
|
|
* returned array does not contain any implicitly declared methods from
|
|
* {@code Object}. Therefore, if no methods are explicitly declared in
|
|
* this interface or any of its superinterfaces then the returned array
|
|
* has length 0. (Note that a {@code Class} object which represents a class
|
|
* always has public methods, inherited from {@code Object}.)
|
|
*
|
|
* <p> The returned array never contains methods with names "{@code <init>}"
|
|
* or "{@code <clinit>}".
|
|
*
|
|
* <p> The elements in the returned array are not sorted and are not in any
|
|
* particular order.
|
|
*
|
|
* <p> Generally, the result is computed as with the following 4 step algorithm.
|
|
* Let C be the class or interface represented by this {@code Class} object:
|
|
* <ol>
|
|
* <li> A union of methods is composed of:
|
|
* <ol type="a">
|
|
* <li> C's declared public instance and static methods as returned by
|
|
* {@link #getDeclaredMethods()} and filtered to include only public
|
|
* methods.</li>
|
|
* <li> If C is a class other than {@code Object}, then include the result
|
|
* of invoking this algorithm recursively on the superclass of C.</li>
|
|
* <li> Include the results of invoking this algorithm recursively on all
|
|
* direct superinterfaces of C, but include only instance methods.</li>
|
|
* </ol></li>
|
|
* <li> Union from step 1 is partitioned into subsets of methods with same
|
|
* signature (name, parameter types) and return type.</li>
|
|
* <li> Within each such subset only the most specific methods are selected.
|
|
* Let method M be a method from a set of methods with same signature
|
|
* and return type. M is most specific if there is no such method
|
|
* N != M from the same set, such that N is more specific than M.
|
|
* N is more specific than M if:
|
|
* <ol type="a">
|
|
* <li> N is declared by a class and M is declared by an interface; or</li>
|
|
* <li> N and M are both declared by classes or both by interfaces and
|
|
* N's declaring type is the same as or a subtype of M's declaring type
|
|
* (clearly, if M's and N's declaring types are the same type, then
|
|
* M and N are the same method).</li>
|
|
* </ol></li>
|
|
* <li> The result of this algorithm is the union of all selected methods from
|
|
* step 3.</li>
|
|
* </ol>
|
|
*
|
|
* @apiNote There may be more than one method with a particular name
|
|
* and parameter types in a class because while the Java language forbids a
|
|
* class to declare multiple methods with the same signature but different
|
|
* return types, the Java virtual machine does not. This
|
|
* increased flexibility in the virtual machine can be used to
|
|
* implement various language features. For example, covariant
|
|
* returns can be implemented with {@linkplain
|
|
* java.lang.reflect.Method#isBridge bridge methods}; the bridge
|
|
* method and the overriding method would have the same
|
|
* signature but different return types.
|
|
*
|
|
* @return the array of {@code Method} objects representing the
|
|
* public methods of this class
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and
|
|
* the caller's class loader is not the same as or an
|
|
* ancestor of the class loader for the current class and
|
|
* invocation of {@link SecurityManager#checkPackageAccess
|
|
* s.checkPackageAccess()} denies access to the package
|
|
* of this class.
|
|
*
|
|
* @jls 8.2 Class Members
|
|
* @jls 8.4 Method Declarations
|
|
* @since 1.1
|
|
*/
|
|
@CallerSensitive
|
|
public Method[] getMethods() throws SecurityException {
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
|
|
}
|
|
return copyMethods(privateGetPublicMethods());
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns an array containing {@code Constructor} objects reflecting
|
|
* all the public constructors of the class represented by this
|
|
* {@code Class} object. An array of length 0 is returned if the
|
|
* class has no public constructors, or if the class is an array class, or
|
|
* if the class reflects a primitive type or void.
|
|
*
|
|
* @apiNote
|
|
* While this method returns an array of {@code
|
|
* Constructor<T>} objects (that is an array of constructors from
|
|
* this class), the return type of this method is {@code
|
|
* Constructor<?>[]} and <em>not</em> {@code Constructor<T>[]} as
|
|
* might be expected. This less informative return type is
|
|
* necessary since after being returned from this method, the
|
|
* array could be modified to hold {@code Constructor} objects for
|
|
* different classes, which would violate the type guarantees of
|
|
* {@code Constructor<T>[]}.
|
|
*
|
|
* @return the array of {@code Constructor} objects representing the
|
|
* public constructors of this class
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and
|
|
* the caller's class loader is not the same as or an
|
|
* ancestor of the class loader for the current class and
|
|
* invocation of {@link SecurityManager#checkPackageAccess
|
|
* s.checkPackageAccess()} denies access to the package
|
|
* of this class.
|
|
*
|
|
* @since 1.1
|
|
*/
|
|
@CallerSensitive
|
|
public Constructor<?>[] getConstructors() throws SecurityException {
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
|
|
}
|
|
return copyConstructors(privateGetDeclaredConstructors(true));
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns a {@code Field} object that reflects the specified public member
|
|
* field of the class or interface represented by this {@code Class}
|
|
* object. The {@code name} parameter is a {@code String} specifying the
|
|
* simple name of the desired field.
|
|
*
|
|
* <p> The field to be reflected is determined by the algorithm that
|
|
* follows. Let C be the class or interface represented by this {@code Class} object:
|
|
*
|
|
* <OL>
|
|
* <LI> If C declares a public field with the name specified, that is the
|
|
* field to be reflected.</LI>
|
|
* <LI> If no field was found in step 1 above, this algorithm is applied
|
|
* recursively to each direct superinterface of C. The direct
|
|
* superinterfaces are searched in the order they were declared.</LI>
|
|
* <LI> If no field was found in steps 1 and 2 above, and C has a
|
|
* superclass S, then this algorithm is invoked recursively upon S.
|
|
* If C has no superclass, then a {@code NoSuchFieldException}
|
|
* is thrown.</LI>
|
|
* </OL>
|
|
*
|
|
* <p> If this {@code Class} object represents an array type, then this
|
|
* method does not find the {@code length} field of the array type.
|
|
*
|
|
* @param name the field name
|
|
* @return the {@code Field} object of this class specified by
|
|
* {@code name}
|
|
* @throws NoSuchFieldException if a field with the specified name is
|
|
* not found.
|
|
* @throws NullPointerException if {@code name} is {@code null}
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and
|
|
* the caller's class loader is not the same as or an
|
|
* ancestor of the class loader for the current class and
|
|
* invocation of {@link SecurityManager#checkPackageAccess
|
|
* s.checkPackageAccess()} denies access to the package
|
|
* of this class.
|
|
*
|
|
* @since 1.1
|
|
* @jls 8.2 Class Members
|
|
* @jls 8.3 Field Declarations
|
|
*/
|
|
@CallerSensitive
|
|
public Field getField(String name)
|
|
throws NoSuchFieldException, SecurityException {
|
|
Objects.requireNonNull(name);
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
|
|
}
|
|
Field field = getField0(name);
|
|
if (field == null) {
|
|
throw new NoSuchFieldException(name);
|
|
}
|
|
return getReflectionFactory().copyField(field);
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns a {@code Method} object that reflects the specified public
|
|
* member method of the class or interface represented by this
|
|
* {@code Class} object. The {@code name} parameter is a
|
|
* {@code String} specifying the simple name of the desired method. The
|
|
* {@code parameterTypes} parameter is an array of {@code Class}
|
|
* objects that identify the method's formal parameter types, in declared
|
|
* order. If {@code parameterTypes} is {@code null}, it is
|
|
* treated as if it were an empty array.
|
|
*
|
|
* <p> If this {@code Class} object represents an array type, then this
|
|
* method finds any public method inherited by the array type from
|
|
* {@code Object} except method {@code clone()}.
|
|
*
|
|
* <p> If this {@code Class} object represents an interface then this
|
|
* method does not find any implicitly declared method from
|
|
* {@code Object}. Therefore, if no methods are explicitly declared in
|
|
* this interface or any of its superinterfaces, then this method does not
|
|
* find any method.
|
|
*
|
|
* <p> This method does not find any method with name "{@code <init>}" or
|
|
* "{@code <clinit>}".
|
|
*
|
|
* <p> Generally, the method to be reflected is determined by the 4 step
|
|
* algorithm that follows.
|
|
* Let C be the class or interface represented by this {@code Class} object:
|
|
* <ol>
|
|
* <li> A union of methods is composed of:
|
|
* <ol type="a">
|
|
* <li> C's declared public instance and static methods as returned by
|
|
* {@link #getDeclaredMethods()} and filtered to include only public
|
|
* methods that match given {@code name} and {@code parameterTypes}</li>
|
|
* <li> If C is a class other than {@code Object}, then include the result
|
|
* of invoking this algorithm recursively on the superclass of C.</li>
|
|
* <li> Include the results of invoking this algorithm recursively on all
|
|
* direct superinterfaces of C, but include only instance methods.</li>
|
|
* </ol></li>
|
|
* <li> This union is partitioned into subsets of methods with same
|
|
* return type (the selection of methods from step 1 also guarantees that
|
|
* they have the same method name and parameter types).</li>
|
|
* <li> Within each such subset only the most specific methods are selected.
|
|
* Let method M be a method from a set of methods with same VM
|
|
* signature (return type, name, parameter types).
|
|
* M is most specific if there is no such method N != M from the same
|
|
* set, such that N is more specific than M. N is more specific than M
|
|
* if:
|
|
* <ol type="a">
|
|
* <li> N is declared by a class and M is declared by an interface; or</li>
|
|
* <li> N and M are both declared by classes or both by interfaces and
|
|
* N's declaring type is the same as or a subtype of M's declaring type
|
|
* (clearly, if M's and N's declaring types are the same type, then
|
|
* M and N are the same method).</li>
|
|
* </ol></li>
|
|
* <li> The result of this algorithm is chosen arbitrarily from the methods
|
|
* with most specific return type among all selected methods from step 3.
|
|
* Let R be a return type of a method M from the set of all selected methods
|
|
* from step 3. M is a method with most specific return type if there is
|
|
* no such method N != M from the same set, having return type S != R,
|
|
* such that S is a subtype of R as determined by
|
|
* R.class.{@link #isAssignableFrom}(S.class).
|
|
* </ol>
|
|
*
|
|
* @apiNote There may be more than one method with matching name and
|
|
* parameter types in a class because while the Java language forbids a
|
|
* class to declare multiple methods with the same signature but different
|
|
* return types, the Java virtual machine does not. This
|
|
* increased flexibility in the virtual machine can be used to
|
|
* implement various language features. For example, covariant
|
|
* returns can be implemented with {@linkplain
|
|
* java.lang.reflect.Method#isBridge bridge methods}; the bridge
|
|
* method and the overriding method would have the same
|
|
* signature but different return types. This method would return the
|
|
* overriding method as it would have a more specific return type.
|
|
*
|
|
* @param name the name of the method
|
|
* @param parameterTypes the list of parameters
|
|
* @return the {@code Method} object that matches the specified
|
|
* {@code name} and {@code parameterTypes}
|
|
* @throws NoSuchMethodException if a matching method is not found
|
|
* or if the name is "<init>"or "<clinit>".
|
|
* @throws NullPointerException if {@code name} is {@code null}
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and
|
|
* the caller's class loader is not the same as or an
|
|
* ancestor of the class loader for the current class and
|
|
* invocation of {@link SecurityManager#checkPackageAccess
|
|
* s.checkPackageAccess()} denies access to the package
|
|
* of this class.
|
|
*
|
|
* @jls 8.2 Class Members
|
|
* @jls 8.4 Method Declarations
|
|
* @since 1.1
|
|
*/
|
|
@CallerSensitive
|
|
public Method getMethod(String name, Class<?>... parameterTypes)
|
|
throws NoSuchMethodException, SecurityException {
|
|
Objects.requireNonNull(name);
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
|
|
}
|
|
Method method = getMethod0(name, parameterTypes);
|
|
if (method == null) {
|
|
throw new NoSuchMethodException(methodToString(name, parameterTypes));
|
|
}
|
|
return getReflectionFactory().copyMethod(method);
|
|
}
|
|
|
|
/**
|
|
* Returns a {@code Constructor} object that reflects the specified
|
|
* public constructor of the class represented by this {@code Class}
|
|
* object. The {@code parameterTypes} parameter is an array of
|
|
* {@code Class} objects that identify the constructor's formal
|
|
* parameter types, in declared order.
|
|
*
|
|
* If this {@code Class} object represents an inner class
|
|
* declared in a non-static context, the formal parameter types
|
|
* include the explicit enclosing instance as the first parameter.
|
|
*
|
|
* <p> The constructor to reflect is the public constructor of the class
|
|
* represented by this {@code Class} object whose formal parameter
|
|
* types match those specified by {@code parameterTypes}.
|
|
*
|
|
* @param parameterTypes the parameter array
|
|
* @return the {@code Constructor} object of the public constructor that
|
|
* matches the specified {@code parameterTypes}
|
|
* @throws NoSuchMethodException if a matching method is not found.
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and
|
|
* the caller's class loader is not the same as or an
|
|
* ancestor of the class loader for the current class and
|
|
* invocation of {@link SecurityManager#checkPackageAccess
|
|
* s.checkPackageAccess()} denies access to the package
|
|
* of this class.
|
|
*
|
|
* @since 1.1
|
|
*/
|
|
@CallerSensitive
|
|
public Constructor<T> getConstructor(Class<?>... parameterTypes)
|
|
throws NoSuchMethodException, SecurityException
|
|
{
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
|
|
}
|
|
return getReflectionFactory().copyConstructor(
|
|
getConstructor0(parameterTypes, Member.PUBLIC));
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns an array of {@code Class} objects reflecting all the
|
|
* classes and interfaces declared as members of the class represented by
|
|
* this {@code Class} object. This includes public, protected, default
|
|
* (package) access, and private classes and interfaces declared by the
|
|
* class, but excludes inherited classes and interfaces. This method
|
|
* returns an array of length 0 if the class declares no classes or
|
|
* interfaces as members, or if this {@code Class} object represents a
|
|
* primitive type, an array class, or void.
|
|
*
|
|
* @return the array of {@code Class} objects representing all the
|
|
* declared members of this class
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and any of the
|
|
* following conditions is met:
|
|
*
|
|
* <ul>
|
|
*
|
|
* <li> the caller's class loader is not the same as the
|
|
* class loader of this class and invocation of
|
|
* {@link SecurityManager#checkPermission
|
|
* s.checkPermission} method with
|
|
* {@code RuntimePermission("accessDeclaredMembers")}
|
|
* denies access to the declared classes within this class
|
|
*
|
|
* <li> the caller's class loader is not the same as or an
|
|
* ancestor of the class loader for the current class and
|
|
* invocation of {@link SecurityManager#checkPackageAccess
|
|
* s.checkPackageAccess()} denies access to the package
|
|
* of this class
|
|
*
|
|
* </ul>
|
|
*
|
|
* @since 1.1
|
|
*/
|
|
@CallerSensitive
|
|
public Class<?>[] getDeclaredClasses() throws SecurityException {
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), false);
|
|
}
|
|
return getDeclaredClasses0();
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns an array of {@code Field} objects reflecting all the fields
|
|
* declared by the class or interface represented by this
|
|
* {@code Class} object. This includes public, protected, default
|
|
* (package) access, and private fields, but excludes inherited fields.
|
|
*
|
|
* <p> If this {@code Class} object represents a class or interface with no
|
|
* declared fields, then this method returns an array of length 0.
|
|
*
|
|
* <p> If this {@code Class} object represents an array type, a primitive
|
|
* type, or void, then this method returns an array of length 0.
|
|
*
|
|
* <p> The elements in the returned array are not sorted and are not in any
|
|
* particular order.
|
|
*
|
|
* @return the array of {@code Field} objects representing all the
|
|
* declared fields of this class
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and any of the
|
|
* following conditions is met:
|
|
*
|
|
* <ul>
|
|
*
|
|
* <li> the caller's class loader is not the same as the
|
|
* class loader of this class and invocation of
|
|
* {@link SecurityManager#checkPermission
|
|
* s.checkPermission} method with
|
|
* {@code RuntimePermission("accessDeclaredMembers")}
|
|
* denies access to the declared fields within this class
|
|
*
|
|
* <li> the caller's class loader is not the same as or an
|
|
* ancestor of the class loader for the current class and
|
|
* invocation of {@link SecurityManager#checkPackageAccess
|
|
* s.checkPackageAccess()} denies access to the package
|
|
* of this class
|
|
*
|
|
* </ul>
|
|
*
|
|
* @since 1.1
|
|
* @jls 8.2 Class Members
|
|
* @jls 8.3 Field Declarations
|
|
*/
|
|
@CallerSensitive
|
|
public Field[] getDeclaredFields() throws SecurityException {
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
|
|
}
|
|
return copyFields(privateGetDeclaredFields(false));
|
|
}
|
|
|
|
/**
|
|
* Returns an array of {@code RecordComponent} objects representing all the
|
|
* record components of this record class, or {@code null} if this class is
|
|
* not a record class.
|
|
*
|
|
* <p> The components are returned in the same order that they are declared
|
|
* in the record header. The array is empty if this record class has no
|
|
* components. If the class is not a record class, that is {@link
|
|
* #isRecord()} returns {@code false}, then this method returns {@code null}.
|
|
* Conversely, if {@link #isRecord()} returns {@code true}, then this method
|
|
* returns a non-null value.
|
|
*
|
|
* @return An array of {@code RecordComponent} objects representing all the
|
|
* record components of this record class, or {@code null} if this
|
|
* class is not a record class
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and any of the
|
|
* following conditions is met:
|
|
*
|
|
* <ul>
|
|
*
|
|
* <li> the caller's class loader is not the same as the
|
|
* class loader of this class and invocation of
|
|
* {@link SecurityManager#checkPermission
|
|
* s.checkPermission} method with
|
|
* {@code RuntimePermission("accessDeclaredMembers")}
|
|
* denies access to the declared methods within this class
|
|
*
|
|
* <li> the caller's class loader is not the same as or an
|
|
* ancestor of the class loader for the current class and
|
|
* invocation of {@link SecurityManager#checkPackageAccess
|
|
* s.checkPackageAccess()} denies access to the package
|
|
* of this class
|
|
*
|
|
* </ul>
|
|
*
|
|
* @jls 8.10 Record Types
|
|
* @since 16
|
|
*/
|
|
@CallerSensitive
|
|
public RecordComponent[] getRecordComponents() {
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
|
|
}
|
|
if (!isRecord()) {
|
|
return null;
|
|
}
|
|
RecordComponent[] recordComponents = getRecordComponents0();
|
|
if (recordComponents == null) {
|
|
return new RecordComponent[0];
|
|
}
|
|
return recordComponents;
|
|
}
|
|
|
|
/**
|
|
* Returns an array containing {@code Method} objects reflecting all the
|
|
* declared methods of the class or interface represented by this {@code
|
|
* Class} object, including public, protected, default (package)
|
|
* access, and private methods, but excluding inherited methods.
|
|
*
|
|
* <p> If this {@code Class} object represents a type that has multiple
|
|
* declared methods with the same name and parameter types, but different
|
|
* return types, then the returned array has a {@code Method} object for
|
|
* each such method.
|
|
*
|
|
* <p> If this {@code Class} object represents a type that has a class
|
|
* initialization method {@code <clinit>}, then the returned array does
|
|
* <em>not</em> have a corresponding {@code Method} object.
|
|
*
|
|
* <p> If this {@code Class} object represents a class or interface with no
|
|
* declared methods, then the returned array has length 0.
|
|
*
|
|
* <p> If this {@code Class} object represents an array type, a primitive
|
|
* type, or void, then the returned array has length 0.
|
|
*
|
|
* <p> The elements in the returned array are not sorted and are not in any
|
|
* particular order.
|
|
*
|
|
* @return the array of {@code Method} objects representing all the
|
|
* declared methods of this class
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and any of the
|
|
* following conditions is met:
|
|
*
|
|
* <ul>
|
|
*
|
|
* <li> the caller's class loader is not the same as the
|
|
* class loader of this class and invocation of
|
|
* {@link SecurityManager#checkPermission
|
|
* s.checkPermission} method with
|
|
* {@code RuntimePermission("accessDeclaredMembers")}
|
|
* denies access to the declared methods within this class
|
|
*
|
|
* <li> the caller's class loader is not the same as or an
|
|
* ancestor of the class loader for the current class and
|
|
* invocation of {@link SecurityManager#checkPackageAccess
|
|
* s.checkPackageAccess()} denies access to the package
|
|
* of this class
|
|
*
|
|
* </ul>
|
|
*
|
|
* @jls 8.2 Class Members
|
|
* @jls 8.4 Method Declarations
|
|
* @since 1.1
|
|
*/
|
|
@CallerSensitive
|
|
public Method[] getDeclaredMethods() throws SecurityException {
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
|
|
}
|
|
return copyMethods(privateGetDeclaredMethods(false));
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns an array of {@code Constructor} objects reflecting all the
|
|
* constructors declared by the class represented by this
|
|
* {@code Class} object. These are public, protected, default
|
|
* (package) access, and private constructors. The elements in the array
|
|
* returned are not sorted and are not in any particular order. If the
|
|
* class has a default constructor, it is included in the returned array.
|
|
* This method returns an array of length 0 if this {@code Class}
|
|
* object represents an interface, a primitive type, an array class, or
|
|
* void.
|
|
*
|
|
* <p> See <cite>The Java Language Specification</cite>,
|
|
* section {@jls 8.2}.
|
|
*
|
|
* @return the array of {@code Constructor} objects representing all the
|
|
* declared constructors of this class
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and any of the
|
|
* following conditions is met:
|
|
*
|
|
* <ul>
|
|
*
|
|
* <li> the caller's class loader is not the same as the
|
|
* class loader of this class and invocation of
|
|
* {@link SecurityManager#checkPermission
|
|
* s.checkPermission} method with
|
|
* {@code RuntimePermission("accessDeclaredMembers")}
|
|
* denies access to the declared constructors within this class
|
|
*
|
|
* <li> the caller's class loader is not the same as or an
|
|
* ancestor of the class loader for the current class and
|
|
* invocation of {@link SecurityManager#checkPackageAccess
|
|
* s.checkPackageAccess()} denies access to the package
|
|
* of this class
|
|
*
|
|
* </ul>
|
|
*
|
|
* @since 1.1
|
|
*/
|
|
@CallerSensitive
|
|
public Constructor<?>[] getDeclaredConstructors() throws SecurityException {
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
|
|
}
|
|
return copyConstructors(privateGetDeclaredConstructors(false));
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns a {@code Field} object that reflects the specified declared
|
|
* field of the class or interface represented by this {@code Class}
|
|
* object. The {@code name} parameter is a {@code String} that specifies
|
|
* the simple name of the desired field.
|
|
*
|
|
* <p> If this {@code Class} object represents an array type, then this
|
|
* method does not find the {@code length} field of the array type.
|
|
*
|
|
* @param name the name of the field
|
|
* @return the {@code Field} object for the specified field in this
|
|
* class
|
|
* @throws NoSuchFieldException if a field with the specified name is
|
|
* not found.
|
|
* @throws NullPointerException if {@code name} is {@code null}
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and any of the
|
|
* following conditions is met:
|
|
*
|
|
* <ul>
|
|
*
|
|
* <li> the caller's class loader is not the same as the
|
|
* class loader of this class and invocation of
|
|
* {@link SecurityManager#checkPermission
|
|
* s.checkPermission} method with
|
|
* {@code RuntimePermission("accessDeclaredMembers")}
|
|
* denies access to the declared field
|
|
*
|
|
* <li> the caller's class loader is not the same as or an
|
|
* ancestor of the class loader for the current class and
|
|
* invocation of {@link SecurityManager#checkPackageAccess
|
|
* s.checkPackageAccess()} denies access to the package
|
|
* of this class
|
|
*
|
|
* </ul>
|
|
*
|
|
* @since 1.1
|
|
* @jls 8.2 Class Members
|
|
* @jls 8.3 Field Declarations
|
|
*/
|
|
@CallerSensitive
|
|
public Field getDeclaredField(String name)
|
|
throws NoSuchFieldException, SecurityException {
|
|
Objects.requireNonNull(name);
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
|
|
}
|
|
Field field = searchFields(privateGetDeclaredFields(false), name);
|
|
if (field == null) {
|
|
throw new NoSuchFieldException(name);
|
|
}
|
|
return getReflectionFactory().copyField(field);
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns a {@code Method} object that reflects the specified
|
|
* declared method of the class or interface represented by this
|
|
* {@code Class} object. The {@code name} parameter is a
|
|
* {@code String} that specifies the simple name of the desired
|
|
* method, and the {@code parameterTypes} parameter is an array of
|
|
* {@code Class} objects that identify the method's formal parameter
|
|
* types, in declared order. If more than one method with the same
|
|
* parameter types is declared in a class, and one of these methods has a
|
|
* return type that is more specific than any of the others, that method is
|
|
* returned; otherwise one of the methods is chosen arbitrarily. If the
|
|
* name is "<init>"or "<clinit>" a {@code NoSuchMethodException}
|
|
* is raised.
|
|
*
|
|
* <p> If this {@code Class} object represents an array type, then this
|
|
* method does not find the {@code clone()} method.
|
|
*
|
|
* @param name the name of the method
|
|
* @param parameterTypes the parameter array
|
|
* @return the {@code Method} object for the method of this class
|
|
* matching the specified name and parameters
|
|
* @throws NoSuchMethodException if a matching method is not found.
|
|
* @throws NullPointerException if {@code name} is {@code null}
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and any of the
|
|
* following conditions is met:
|
|
*
|
|
* <ul>
|
|
*
|
|
* <li> the caller's class loader is not the same as the
|
|
* class loader of this class and invocation of
|
|
* {@link SecurityManager#checkPermission
|
|
* s.checkPermission} method with
|
|
* {@code RuntimePermission("accessDeclaredMembers")}
|
|
* denies access to the declared method
|
|
*
|
|
* <li> the caller's class loader is not the same as or an
|
|
* ancestor of the class loader for the current class and
|
|
* invocation of {@link SecurityManager#checkPackageAccess
|
|
* s.checkPackageAccess()} denies access to the package
|
|
* of this class
|
|
*
|
|
* </ul>
|
|
*
|
|
* @jls 8.2 Class Members
|
|
* @jls 8.4 Method Declarations
|
|
* @since 1.1
|
|
*/
|
|
@CallerSensitive
|
|
public Method getDeclaredMethod(String name, Class<?>... parameterTypes)
|
|
throws NoSuchMethodException, SecurityException {
|
|
Objects.requireNonNull(name);
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
|
|
}
|
|
Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes);
|
|
if (method == null) {
|
|
throw new NoSuchMethodException(methodToString(name, parameterTypes));
|
|
}
|
|
return getReflectionFactory().copyMethod(method);
|
|
}
|
|
|
|
/**
|
|
* Returns the list of {@code Method} objects for the declared public
|
|
* methods of this class or interface that have the specified method name
|
|
* and parameter types.
|
|
*
|
|
* @param name the name of the method
|
|
* @param parameterTypes the parameter array
|
|
* @return the list of {@code Method} objects for the public methods of
|
|
* this class matching the specified name and parameters
|
|
*/
|
|
List<Method> getDeclaredPublicMethods(String name, Class<?>... parameterTypes) {
|
|
Method[] methods = privateGetDeclaredMethods(/* publicOnly */ true);
|
|
ReflectionFactory factory = getReflectionFactory();
|
|
List<Method> result = new ArrayList<>();
|
|
for (Method method : methods) {
|
|
if (method.getName().equals(name)
|
|
&& Arrays.equals(
|
|
factory.getExecutableSharedParameterTypes(method),
|
|
parameterTypes)) {
|
|
result.add(factory.copyMethod(method));
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Returns a {@code Constructor} object that reflects the specified
|
|
* constructor of the class or interface represented by this
|
|
* {@code Class} object. The {@code parameterTypes} parameter is
|
|
* an array of {@code Class} objects that identify the constructor's
|
|
* formal parameter types, in declared order.
|
|
*
|
|
* If this {@code Class} object represents an inner class
|
|
* declared in a non-static context, the formal parameter types
|
|
* include the explicit enclosing instance as the first parameter.
|
|
*
|
|
* @param parameterTypes the parameter array
|
|
* @return The {@code Constructor} object for the constructor with the
|
|
* specified parameter list
|
|
* @throws NoSuchMethodException if a matching method is not found.
|
|
* @throws SecurityException
|
|
* If a security manager, <i>s</i>, is present and any of the
|
|
* following conditions is met:
|
|
*
|
|
* <ul>
|
|
*
|
|
* <li> the caller's class loader is not the same as the
|
|
* class loader of this class and invocation of
|
|
* {@link SecurityManager#checkPermission
|
|
* s.checkPermission} method with
|
|
* {@code RuntimePermission("accessDeclaredMembers")}
|
|
* denies access to the declared constructor
|
|
*
|
|
* <li> the caller's class loader is not the same as or an
|
|
* ancestor of the class loader for the current class and
|
|
* invocation of {@link SecurityManager#checkPackageAccess
|
|
* s.checkPackageAccess()} denies access to the package
|
|
* of this class
|
|
*
|
|
* </ul>
|
|
*
|
|
* @since 1.1
|
|
*/
|
|
@CallerSensitive
|
|
public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes)
|
|
throws NoSuchMethodException, SecurityException
|
|
{
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
|
|
}
|
|
|
|
return getReflectionFactory().copyConstructor(
|
|
getConstructor0(parameterTypes, Member.DECLARED));
|
|
}
|
|
|
|
/**
|
|
* Finds a resource with a given name.
|
|
*
|
|
* <p> If this class is in a named {@link Module Module} then this method
|
|
* will attempt to find the resource in the module. This is done by
|
|
* delegating to the module's class loader {@link
|
|
* ClassLoader#findResource(String,String) findResource(String,String)}
|
|
* method, invoking it with the module name and the absolute name of the
|
|
* resource. Resources in named modules are subject to the rules for
|
|
* encapsulation specified in the {@code Module} {@link
|
|
* Module#getResourceAsStream getResourceAsStream} method and so this
|
|
* method returns {@code null} when the resource is a
|
|
* non-"{@code .class}" resource in a package that is not open to the
|
|
* caller's module.
|
|
*
|
|
* <p> Otherwise, if this class is not in a named module then the rules for
|
|
* searching resources associated with a given class are implemented by the
|
|
* defining {@linkplain ClassLoader class loader} of the class. This method
|
|
* delegates to this {@code Class} object's class loader.
|
|
* If this {@code Class} object was loaded by the bootstrap class loader,
|
|
* the method delegates to {@link ClassLoader#getSystemResourceAsStream}.
|
|
*
|
|
* <p> Before delegation, an absolute resource name is constructed from the
|
|
* given resource name using this algorithm:
|
|
*
|
|
* <ul>
|
|
*
|
|
* <li> If the {@code name} begins with a {@code '/'}
|
|
* (<code>'\u002f'</code>), then the absolute name of the resource is the
|
|
* portion of the {@code name} following the {@code '/'}.
|
|
*
|
|
* <li> Otherwise, the absolute name is of the following form:
|
|
*
|
|
* <blockquote>
|
|
* {@code modified_package_name/name}
|
|
* </blockquote>
|
|
*
|
|
* <p> Where the {@code modified_package_name} is the package name of this
|
|
* object with {@code '/'} substituted for {@code '.'}
|
|
* (<code>'\u002e'</code>).
|
|
*
|
|
* </ul>
|
|
*
|
|
* @param name name of the desired resource
|
|
* @return A {@link java.io.InputStream} object; {@code null} if no
|
|
* resource with this name is found, the resource is in a package
|
|
* that is not {@linkplain Module#isOpen(String, Module) open} to at
|
|
* least the caller module, or access to the resource is denied
|
|
* by the security manager.
|
|
* @throws NullPointerException If {@code name} is {@code null}
|
|
*
|
|
* @see Module#getResourceAsStream(String)
|
|
* @since 1.1
|
|
* @revised 9
|
|
*/
|
|
@CallerSensitive
|
|
public InputStream getResourceAsStream(String name) {
|
|
name = resolveName(name);
|
|
|
|
Module thisModule = getModule();
|
|
if (thisModule.isNamed()) {
|
|
// check if resource can be located by caller
|
|
if (Resources.canEncapsulate(name)
|
|
&& !isOpenToCaller(name, Reflection.getCallerClass())) {
|
|
return null;
|
|
}
|
|
|
|
// resource not encapsulated or in package open to caller
|
|
String mn = thisModule.getName();
|
|
ClassLoader cl = getClassLoader0();
|
|
try {
|
|
|
|
// special-case built-in class loaders to avoid the
|
|
// need for a URL connection
|
|
if (cl == null) {
|
|
return BootLoader.findResourceAsStream(mn, name);
|
|
} else if (cl instanceof BuiltinClassLoader) {
|
|
return ((BuiltinClassLoader) cl).findResourceAsStream(mn, name);
|
|
} else {
|
|
URL url = cl.findResource(mn, name);
|
|
return (url != null) ? url.openStream() : null;
|
|
}
|
|
|
|
} catch (IOException | SecurityException e) {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
// unnamed module
|
|
ClassLoader cl = getClassLoader0();
|
|
if (cl == null) {
|
|
return ClassLoader.getSystemResourceAsStream(name);
|
|
} else {
|
|
return cl.getResourceAsStream(name);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Finds a resource with a given name.
|
|
*
|
|
* <p> If this class is in a named {@link Module Module} then this method
|
|
* will attempt to find the resource in the module. This is done by
|
|
* delegating to the module's class loader {@link
|
|
* ClassLoader#findResource(String,String) findResource(String,String)}
|
|
* method, invoking it with the module name and the absolute name of the
|
|
* resource. Resources in named modules are subject to the rules for
|
|
* encapsulation specified in the {@code Module} {@link
|
|
* Module#getResourceAsStream getResourceAsStream} method and so this
|
|
* method returns {@code null} when the resource is a
|
|
* non-"{@code .class}" resource in a package that is not open to the
|
|
* caller's module.
|
|
*
|
|
* <p> Otherwise, if this class is not in a named module then the rules for
|
|
* searching resources associated with a given class are implemented by the
|
|
* defining {@linkplain ClassLoader class loader} of the class. This method
|
|
* delegates to this {@code Class} object's class loader.
|
|
* If this {@code Class} object was loaded by the bootstrap class loader,
|
|
* the method delegates to {@link ClassLoader#getSystemResource}.
|
|
*
|
|
* <p> Before delegation, an absolute resource name is constructed from the
|
|
* given resource name using this algorithm:
|
|
*
|
|
* <ul>
|
|
*
|
|
* <li> If the {@code name} begins with a {@code '/'}
|
|
* (<code>'\u002f'</code>), then the absolute name of the resource is the
|
|
* portion of the {@code name} following the {@code '/'}.
|
|
*
|
|
* <li> Otherwise, the absolute name is of the following form:
|
|
*
|
|
* <blockquote>
|
|
* {@code modified_package_name/name}
|
|
* </blockquote>
|
|
*
|
|
* <p> Where the {@code modified_package_name} is the package name of this
|
|
* object with {@code '/'} substituted for {@code '.'}
|
|
* (<code>'\u002e'</code>).
|
|
*
|
|
* </ul>
|
|
*
|
|
* @param name name of the desired resource
|
|
* @return A {@link java.net.URL} object; {@code null} if no resource with
|
|
* this name is found, the resource cannot be located by a URL, the
|
|
* resource is in a package that is not
|
|
* {@linkplain Module#isOpen(String, Module) open} to at least the caller
|
|
* module, or access to the resource is denied by the security
|
|
* manager.
|
|
* @throws NullPointerException If {@code name} is {@code null}
|
|
* @since 1.1
|
|
* @revised 9
|
|
*/
|
|
@CallerSensitive
|
|
public URL getResource(String name) {
|
|
name = resolveName(name);
|
|
|
|
Module thisModule = getModule();
|
|
if (thisModule.isNamed()) {
|
|
// check if resource can be located by caller
|
|
if (Resources.canEncapsulate(name)
|
|
&& !isOpenToCaller(name, Reflection.getCallerClass())) {
|
|
return null;
|
|
}
|
|
|
|
// resource not encapsulated or in package open to caller
|
|
String mn = thisModule.getName();
|
|
ClassLoader cl = getClassLoader0();
|
|
try {
|
|
if (cl == null) {
|
|
return BootLoader.findResource(mn, name);
|
|
} else {
|
|
return cl.findResource(mn, name);
|
|
}
|
|
} catch (IOException ioe) {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
// unnamed module
|
|
ClassLoader cl = getClassLoader0();
|
|
if (cl == null) {
|
|
return ClassLoader.getSystemResource(name);
|
|
} else {
|
|
return cl.getResource(name);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns true if a resource with the given name can be located by the
|
|
* given caller. All resources in a module can be located by code in
|
|
* the module. For other callers, then the package needs to be open to
|
|
* the caller.
|
|
*/
|
|
private boolean isOpenToCaller(String name, Class<?> caller) {
|
|
// assert getModule().isNamed();
|
|
Module thisModule = getModule();
|
|
Module callerModule = (caller != null) ? caller.getModule() : null;
|
|
if (callerModule != thisModule) {
|
|
String pn = Resources.toPackageName(name);
|
|
if (thisModule.getDescriptor().packages().contains(pn)) {
|
|
if (callerModule == null && !thisModule.isOpen(pn)) {
|
|
// no caller, package not open
|
|
return false;
|
|
}
|
|
if (!thisModule.isOpen(pn, callerModule)) {
|
|
// package not open to caller
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
/** protection domain returned when the internal domain is null */
|
|
private static java.security.ProtectionDomain allPermDomain;
|
|
|
|
/**
|
|
* Returns the {@code ProtectionDomain} of this class. If there is a
|
|
* security manager installed, this method first calls the security
|
|
* manager's {@code checkPermission} method with a
|
|
* {@code RuntimePermission("getProtectionDomain")} permission to
|
|
* ensure it's ok to get the
|
|
* {@code ProtectionDomain}.
|
|
*
|
|
* @return the ProtectionDomain of this class
|
|
*
|
|
* @throws SecurityException
|
|
* if a security manager exists and its
|
|
* {@code checkPermission} method doesn't allow
|
|
* getting the ProtectionDomain.
|
|
*
|
|
* @see java.security.ProtectionDomain
|
|
* @see SecurityManager#checkPermission
|
|
* @see java.lang.RuntimePermission
|
|
* @since 1.2
|
|
*/
|
|
public java.security.ProtectionDomain getProtectionDomain() {
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
sm.checkPermission(SecurityConstants.GET_PD_PERMISSION);
|
|
}
|
|
return protectionDomain();
|
|
}
|
|
|
|
// package-private
|
|
java.security.ProtectionDomain protectionDomain() {
|
|
java.security.ProtectionDomain pd = getProtectionDomain0();
|
|
if (pd == null) {
|
|
if (allPermDomain == null) {
|
|
java.security.Permissions perms =
|
|
new java.security.Permissions();
|
|
perms.add(SecurityConstants.ALL_PERMISSION);
|
|
allPermDomain =
|
|
new java.security.ProtectionDomain(null, perms);
|
|
}
|
|
pd = allPermDomain;
|
|
}
|
|
return pd;
|
|
}
|
|
|
|
/**
|
|
* Returns the ProtectionDomain of this class.
|
|
*/
|
|
private native java.security.ProtectionDomain getProtectionDomain0();
|
|
|
|
/*
|
|
* Return the Virtual Machine's Class object for the named
|
|
* primitive type.
|
|
*/
|
|
static native Class<?> getPrimitiveClass(String name);
|
|
|
|
/*
|
|
* Check if client is allowed to access members. If access is denied,
|
|
* throw a SecurityException.
|
|
*
|
|
* This method also enforces package access.
|
|
*
|
|
* <p> Default policy: allow all clients access with normal Java access
|
|
* control.
|
|
*
|
|
* <p> NOTE: should only be called if a SecurityManager is installed
|
|
*/
|
|
private void checkMemberAccess(SecurityManager sm, int which,
|
|
Class<?> caller, boolean checkProxyInterfaces) {
|
|
/* Default policy allows access to all {@link Member#PUBLIC} members,
|
|
* as well as access to classes that have the same class loader as the caller.
|
|
* In all other cases, it requires RuntimePermission("accessDeclaredMembers")
|
|
* permission.
|
|
*/
|
|
final ClassLoader ccl = ClassLoader.getClassLoader(caller);
|
|
if (which != Member.PUBLIC) {
|
|
final ClassLoader cl = getClassLoader0();
|
|
if (ccl != cl) {
|
|
sm.checkPermission(SecurityConstants.CHECK_MEMBER_ACCESS_PERMISSION);
|
|
}
|
|
}
|
|
this.checkPackageAccess(sm, ccl, checkProxyInterfaces);
|
|
}
|
|
|
|
/*
|
|
* Checks if a client loaded in ClassLoader ccl is allowed to access this
|
|
* class under the current package access policy. If access is denied,
|
|
* throw a SecurityException.
|
|
*
|
|
* NOTE: this method should only be called if a SecurityManager is active
|
|
*/
|
|
private void checkPackageAccess(SecurityManager sm, final ClassLoader ccl,
|
|
boolean checkProxyInterfaces) {
|
|
final ClassLoader cl = getClassLoader0();
|
|
|
|
if (ReflectUtil.needsPackageAccessCheck(ccl, cl)) {
|
|
String pkg = this.getPackageName();
|
|
if (pkg != null && !pkg.isEmpty()) {
|
|
// skip the package access check on a proxy class in default proxy package
|
|
if (!Proxy.isProxyClass(this) || ReflectUtil.isNonPublicProxyClass(this)) {
|
|
sm.checkPackageAccess(pkg);
|
|
}
|
|
}
|
|
}
|
|
// check package access on the proxy interfaces
|
|
if (checkProxyInterfaces && Proxy.isProxyClass(this)) {
|
|
ReflectUtil.checkProxyPackageAccess(ccl, this.getInterfaces());
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Add a package name prefix if the name is not absolute Remove leading "/"
|
|
* if name is absolute
|
|
*/
|
|
private String resolveName(String name) {
|
|
if (!name.startsWith("/")) {
|
|
Class<?> c = isArray() ? elementType() : this;
|
|
String baseName = c.getPackageName();
|
|
if (baseName != null && !baseName.isEmpty()) {
|
|
name = baseName.replace('.', '/') + "/" + name;
|
|
}
|
|
} else {
|
|
name = name.substring(1);
|
|
}
|
|
return name;
|
|
}
|
|
|
|
/**
|
|
* Atomic operations support.
|
|
*/
|
|
private static class Atomic {
|
|
// initialize Unsafe machinery here, since we need to call Class.class instance method
|
|
// and have to avoid calling it in the static initializer of the Class class...
|
|
private static final Unsafe unsafe = Unsafe.getUnsafe();
|
|
// offset of Class.reflectionData instance field
|
|
private static final long reflectionDataOffset
|
|
= unsafe.objectFieldOffset(Class.class, "reflectionData");
|
|
// offset of Class.annotationType instance field
|
|
private static final long annotationTypeOffset
|
|
= unsafe.objectFieldOffset(Class.class, "annotationType");
|
|
// offset of Class.annotationData instance field
|
|
private static final long annotationDataOffset
|
|
= unsafe.objectFieldOffset(Class.class, "annotationData");
|
|
|
|
static <T> boolean casReflectionData(Class<?> clazz,
|
|
SoftReference<ReflectionData<T>> oldData,
|
|
SoftReference<ReflectionData<T>> newData) {
|
|
return unsafe.compareAndSetReference(clazz, reflectionDataOffset, oldData, newData);
|
|
}
|
|
|
|
static <T> boolean casAnnotationType(Class<?> clazz,
|
|
AnnotationType oldType,
|
|
AnnotationType newType) {
|
|
return unsafe.compareAndSetReference(clazz, annotationTypeOffset, oldType, newType);
|
|
}
|
|
|
|
static <T> boolean casAnnotationData(Class<?> clazz,
|
|
AnnotationData oldData,
|
|
AnnotationData newData) {
|
|
return unsafe.compareAndSetReference(clazz, annotationDataOffset, oldData, newData);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Reflection support.
|
|
*/
|
|
|
|
// Reflection data caches various derived names and reflective members. Cached
|
|
// values may be invalidated when JVM TI RedefineClasses() is called
|
|
private static class ReflectionData<T> {
|
|
volatile Field[] declaredFields;
|
|
volatile Field[] publicFields;
|
|
volatile Method[] declaredMethods;
|
|
volatile Method[] publicMethods;
|
|
volatile Constructor<T>[] declaredConstructors;
|
|
volatile Constructor<T>[] publicConstructors;
|
|
// Intermediate results for getFields and getMethods
|
|
volatile Field[] declaredPublicFields;
|
|
volatile Method[] declaredPublicMethods;
|
|
volatile Class<?>[] interfaces;
|
|
|
|
// Cached names
|
|
String simpleName;
|
|
String canonicalName;
|
|
static final String NULL_SENTINEL = new String();
|
|
|
|
// Value of classRedefinedCount when we created this ReflectionData instance
|
|
final int redefinedCount;
|
|
|
|
ReflectionData(int redefinedCount) {
|
|
this.redefinedCount = redefinedCount;
|
|
}
|
|
}
|
|
|
|
private transient volatile SoftReference<ReflectionData<T>> reflectionData;
|
|
|
|
// Incremented by the VM on each call to JVM TI RedefineClasses()
|
|
// that redefines this class or a superclass.
|
|
private transient volatile int classRedefinedCount;
|
|
|
|
// Lazily create and cache ReflectionData
|
|
private ReflectionData<T> reflectionData() {
|
|
SoftReference<ReflectionData<T>> reflectionData = this.reflectionData;
|
|
int classRedefinedCount = this.classRedefinedCount;
|
|
ReflectionData<T> rd;
|
|
if (reflectionData != null &&
|
|
(rd = reflectionData.get()) != null &&
|
|
rd.redefinedCount == classRedefinedCount) {
|
|
return rd;
|
|
}
|
|
// else no SoftReference or cleared SoftReference or stale ReflectionData
|
|
// -> create and replace new instance
|
|
return newReflectionData(reflectionData, classRedefinedCount);
|
|
}
|
|
|
|
private ReflectionData<T> newReflectionData(SoftReference<ReflectionData<T>> oldReflectionData,
|
|
int classRedefinedCount) {
|
|
while (true) {
|
|
ReflectionData<T> rd = new ReflectionData<>(classRedefinedCount);
|
|
// try to CAS it...
|
|
if (Atomic.casReflectionData(this, oldReflectionData, new SoftReference<>(rd))) {
|
|
return rd;
|
|
}
|
|
// else retry
|
|
oldReflectionData = this.reflectionData;
|
|
classRedefinedCount = this.classRedefinedCount;
|
|
if (oldReflectionData != null &&
|
|
(rd = oldReflectionData.get()) != null &&
|
|
rd.redefinedCount == classRedefinedCount) {
|
|
return rd;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Generic signature handling
|
|
private native String getGenericSignature0();
|
|
|
|
// Generic info repository; lazily initialized
|
|
private transient volatile ClassRepository genericInfo;
|
|
|
|
// accessor for factory
|
|
private GenericsFactory getFactory() {
|
|
// create scope and factory
|
|
return CoreReflectionFactory.make(this, ClassScope.make(this));
|
|
}
|
|
|
|
// accessor for generic info repository;
|
|
// generic info is lazily initialized
|
|
private ClassRepository getGenericInfo() {
|
|
ClassRepository genericInfo = this.genericInfo;
|
|
if (genericInfo == null) {
|
|
String signature = getGenericSignature0();
|
|
if (signature == null) {
|
|
genericInfo = ClassRepository.NONE;
|
|
} else {
|
|
genericInfo = ClassRepository.make(signature, getFactory());
|
|
}
|
|
this.genericInfo = genericInfo;
|
|
}
|
|
return (genericInfo != ClassRepository.NONE) ? genericInfo : null;
|
|
}
|
|
|
|
// Annotations handling
|
|
native byte[] getRawAnnotations();
|
|
// Since 1.8
|
|
native byte[] getRawTypeAnnotations();
|
|
static byte[] getExecutableTypeAnnotationBytes(Executable ex) {
|
|
return getReflectionFactory().getExecutableTypeAnnotationBytes(ex);
|
|
}
|
|
|
|
native ConstantPool getConstantPool();
|
|
|
|
//
|
|
//
|
|
// java.lang.reflect.Field handling
|
|
//
|
|
//
|
|
|
|
// Returns an array of "root" fields. These Field objects must NOT
|
|
// be propagated to the outside world, but must instead be copied
|
|
// via ReflectionFactory.copyField.
|
|
private Field[] privateGetDeclaredFields(boolean publicOnly) {
|
|
Field[] res;
|
|
ReflectionData<T> rd = reflectionData();
|
|
if (rd != null) {
|
|
res = publicOnly ? rd.declaredPublicFields : rd.declaredFields;
|
|
if (res != null) return res;
|
|
}
|
|
// No cached value available; request value from VM
|
|
res = Reflection.filterFields(this, getDeclaredFields0(publicOnly));
|
|
if (rd != null) {
|
|
if (publicOnly) {
|
|
rd.declaredPublicFields = res;
|
|
} else {
|
|
rd.declaredFields = res;
|
|
}
|
|
}
|
|
return res;
|
|
}
|
|
|
|
// Returns an array of "root" fields. These Field objects must NOT
|
|
// be propagated to the outside world, but must instead be copied
|
|
// via ReflectionFactory.copyField.
|
|
private Field[] privateGetPublicFields() {
|
|
Field[] res;
|
|
ReflectionData<T> rd = reflectionData();
|
|
if (rd != null) {
|
|
res = rd.publicFields;
|
|
if (res != null) return res;
|
|
}
|
|
|
|
// Use a linked hash set to ensure order is preserved and
|
|
// fields from common super interfaces are not duplicated
|
|
LinkedHashSet<Field> fields = new LinkedHashSet<>();
|
|
|
|
// Local fields
|
|
addAll(fields, privateGetDeclaredFields(true));
|
|
|
|
// Direct superinterfaces, recursively
|
|
for (Class<?> si : getInterfaces()) {
|
|
addAll(fields, si.privateGetPublicFields());
|
|
}
|
|
|
|
// Direct superclass, recursively
|
|
Class<?> sc = getSuperclass();
|
|
if (sc != null) {
|
|
addAll(fields, sc.privateGetPublicFields());
|
|
}
|
|
|
|
res = fields.toArray(new Field[0]);
|
|
if (rd != null) {
|
|
rd.publicFields = res;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
private static void addAll(Collection<Field> c, Field[] o) {
|
|
for (Field f : o) {
|
|
c.add(f);
|
|
}
|
|
}
|
|
|
|
|
|
//
|
|
//
|
|
// java.lang.reflect.Constructor handling
|
|
//
|
|
//
|
|
|
|
// Returns an array of "root" constructors. These Constructor
|
|
// objects must NOT be propagated to the outside world, but must
|
|
// instead be copied via ReflectionFactory.copyConstructor.
|
|
private Constructor<T>[] privateGetDeclaredConstructors(boolean publicOnly) {
|
|
Constructor<T>[] res;
|
|
ReflectionData<T> rd = reflectionData();
|
|
if (rd != null) {
|
|
res = publicOnly ? rd.publicConstructors : rd.declaredConstructors;
|
|
if (res != null) return res;
|
|
}
|
|
// No cached value available; request value from VM
|
|
if (isInterface()) {
|
|
@SuppressWarnings("unchecked")
|
|
Constructor<T>[] temporaryRes = (Constructor<T>[]) new Constructor<?>[0];
|
|
res = temporaryRes;
|
|
} else {
|
|
res = getDeclaredConstructors0(publicOnly);
|
|
}
|
|
if (rd != null) {
|
|
if (publicOnly) {
|
|
rd.publicConstructors = res;
|
|
} else {
|
|
rd.declaredConstructors = res;
|
|
}
|
|
}
|
|
return res;
|
|
}
|
|
|
|
//
|
|
//
|
|
// java.lang.reflect.Method handling
|
|
//
|
|
//
|
|
|
|
// Returns an array of "root" methods. These Method objects must NOT
|
|
// be propagated to the outside world, but must instead be copied
|
|
// via ReflectionFactory.copyMethod.
|
|
private Method[] privateGetDeclaredMethods(boolean publicOnly) {
|
|
Method[] res;
|
|
ReflectionData<T> rd = reflectionData();
|
|
if (rd != null) {
|
|
res = publicOnly ? rd.declaredPublicMethods : rd.declaredMethods;
|
|
if (res != null) return res;
|
|
}
|
|
// No cached value available; request value from VM
|
|
res = Reflection.filterMethods(this, getDeclaredMethods0(publicOnly));
|
|
if (rd != null) {
|
|
if (publicOnly) {
|
|
rd.declaredPublicMethods = res;
|
|
} else {
|
|
rd.declaredMethods = res;
|
|
}
|
|
}
|
|
return res;
|
|
}
|
|
|
|
// Returns an array of "root" methods. These Method objects must NOT
|
|
// be propagated to the outside world, but must instead be copied
|
|
// via ReflectionFactory.copyMethod.
|
|
private Method[] privateGetPublicMethods() {
|
|
Method[] res;
|
|
ReflectionData<T> rd = reflectionData();
|
|
if (rd != null) {
|
|
res = rd.publicMethods;
|
|
if (res != null) return res;
|
|
}
|
|
|
|
// No cached value available; compute value recursively.
|
|
// Start by fetching public declared methods...
|
|
PublicMethods pms = new PublicMethods();
|
|
for (Method m : privateGetDeclaredMethods(/* publicOnly */ true)) {
|
|
pms.merge(m);
|
|
}
|
|
// ...then recur over superclass methods...
|
|
Class<?> sc = getSuperclass();
|
|
if (sc != null) {
|
|
for (Method m : sc.privateGetPublicMethods()) {
|
|
pms.merge(m);
|
|
}
|
|
}
|
|
// ...and finally over direct superinterfaces.
|
|
for (Class<?> intf : getInterfaces(/* cloneArray */ false)) {
|
|
for (Method m : intf.privateGetPublicMethods()) {
|
|
// static interface methods are not inherited
|
|
if (!Modifier.isStatic(m.getModifiers())) {
|
|
pms.merge(m);
|
|
}
|
|
}
|
|
}
|
|
|
|
res = pms.toArray();
|
|
if (rd != null) {
|
|
rd.publicMethods = res;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
|
|
//
|
|
// Helpers for fetchers of one field, method, or constructor
|
|
//
|
|
|
|
// This method does not copy the returned Field object!
|
|
private static Field searchFields(Field[] fields, String name) {
|
|
for (Field field : fields) {
|
|
if (field.getName().equals(name)) {
|
|
return field;
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
// Returns a "root" Field object. This Field object must NOT
|
|
// be propagated to the outside world, but must instead be copied
|
|
// via ReflectionFactory.copyField.
|
|
private Field getField0(String name) {
|
|
// Note: the intent is that the search algorithm this routine
|
|
// uses be equivalent to the ordering imposed by
|
|
// privateGetPublicFields(). It fetches only the declared
|
|
// public fields for each class, however, to reduce the number
|
|
// of Field objects which have to be created for the common
|
|
// case where the field being requested is declared in the
|
|
// class which is being queried.
|
|
Field res;
|
|
// Search declared public fields
|
|
if ((res = searchFields(privateGetDeclaredFields(true), name)) != null) {
|
|
return res;
|
|
}
|
|
// Direct superinterfaces, recursively
|
|
Class<?>[] interfaces = getInterfaces(/* cloneArray */ false);
|
|
for (Class<?> c : interfaces) {
|
|
if ((res = c.getField0(name)) != null) {
|
|
return res;
|
|
}
|
|
}
|
|
// Direct superclass, recursively
|
|
if (!isInterface()) {
|
|
Class<?> c = getSuperclass();
|
|
if (c != null) {
|
|
if ((res = c.getField0(name)) != null) {
|
|
return res;
|
|
}
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
// This method does not copy the returned Method object!
|
|
private static Method searchMethods(Method[] methods,
|
|
String name,
|
|
Class<?>[] parameterTypes)
|
|
{
|
|
ReflectionFactory fact = getReflectionFactory();
|
|
Method res = null;
|
|
for (Method m : methods) {
|
|
if (m.getName().equals(name)
|
|
&& arrayContentsEq(parameterTypes,
|
|
fact.getExecutableSharedParameterTypes(m))
|
|
&& (res == null
|
|
|| (res.getReturnType() != m.getReturnType()
|
|
&& res.getReturnType().isAssignableFrom(m.getReturnType()))))
|
|
res = m;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
private static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[0];
|
|
|
|
// Returns a "root" Method object. This Method object must NOT
|
|
// be propagated to the outside world, but must instead be copied
|
|
// via ReflectionFactory.copyMethod.
|
|
private Method getMethod0(String name, Class<?>[] parameterTypes) {
|
|
PublicMethods.MethodList res = getMethodsRecursive(
|
|
name,
|
|
parameterTypes == null ? EMPTY_CLASS_ARRAY : parameterTypes,
|
|
/* includeStatic */ true);
|
|
return res == null ? null : res.getMostSpecific();
|
|
}
|
|
|
|
// Returns a list of "root" Method objects. These Method objects must NOT
|
|
// be propagated to the outside world, but must instead be copied
|
|
// via ReflectionFactory.copyMethod.
|
|
private PublicMethods.MethodList getMethodsRecursive(String name,
|
|
Class<?>[] parameterTypes,
|
|
boolean includeStatic) {
|
|
// 1st check declared public methods
|
|
Method[] methods = privateGetDeclaredMethods(/* publicOnly */ true);
|
|
PublicMethods.MethodList res = PublicMethods.MethodList
|
|
.filter(methods, name, parameterTypes, includeStatic);
|
|
// if there is at least one match among declared methods, we need not
|
|
// search any further as such match surely overrides matching methods
|
|
// declared in superclass(es) or interface(s).
|
|
if (res != null) {
|
|
return res;
|
|
}
|
|
|
|
// if there was no match among declared methods,
|
|
// we must consult the superclass (if any) recursively...
|
|
Class<?> sc = getSuperclass();
|
|
if (sc != null) {
|
|
res = sc.getMethodsRecursive(name, parameterTypes, includeStatic);
|
|
}
|
|
|
|
// ...and coalesce the superclass methods with methods obtained
|
|
// from directly implemented interfaces excluding static methods...
|
|
for (Class<?> intf : getInterfaces(/* cloneArray */ false)) {
|
|
res = PublicMethods.MethodList.merge(
|
|
res, intf.getMethodsRecursive(name, parameterTypes,
|
|
/* includeStatic */ false));
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
// Returns a "root" Constructor object. This Constructor object must NOT
|
|
// be propagated to the outside world, but must instead be copied
|
|
// via ReflectionFactory.copyConstructor.
|
|
private Constructor<T> getConstructor0(Class<?>[] parameterTypes,
|
|
int which) throws NoSuchMethodException
|
|
{
|
|
ReflectionFactory fact = getReflectionFactory();
|
|
Constructor<T>[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC));
|
|
for (Constructor<T> constructor : constructors) {
|
|
if (arrayContentsEq(parameterTypes,
|
|
fact.getExecutableSharedParameterTypes(constructor))) {
|
|
return constructor;
|
|
}
|
|
}
|
|
throw new NoSuchMethodException(methodToString("<init>", parameterTypes));
|
|
}
|
|
|
|
//
|
|
// Other helpers and base implementation
|
|
//
|
|
|
|
private static boolean arrayContentsEq(Object[] a1, Object[] a2) {
|
|
if (a1 == null) {
|
|
return a2 == null || a2.length == 0;
|
|
}
|
|
|
|
if (a2 == null) {
|
|
return a1.length == 0;
|
|
}
|
|
|
|
if (a1.length != a2.length) {
|
|
return false;
|
|
}
|
|
|
|
for (int i = 0; i < a1.length; i++) {
|
|
if (a1[i] != a2[i]) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
private static Field[] copyFields(Field[] arg) {
|
|
Field[] out = new Field[arg.length];
|
|
ReflectionFactory fact = getReflectionFactory();
|
|
for (int i = 0; i < arg.length; i++) {
|
|
out[i] = fact.copyField(arg[i]);
|
|
}
|
|
return out;
|
|
}
|
|
|
|
private static Method[] copyMethods(Method[] arg) {
|
|
Method[] out = new Method[arg.length];
|
|
ReflectionFactory fact = getReflectionFactory();
|
|
for (int i = 0; i < arg.length; i++) {
|
|
out[i] = fact.copyMethod(arg[i]);
|
|
}
|
|
return out;
|
|
}
|
|
|
|
private static <U> Constructor<U>[] copyConstructors(Constructor<U>[] arg) {
|
|
Constructor<U>[] out = arg.clone();
|
|
ReflectionFactory fact = getReflectionFactory();
|
|
for (int i = 0; i < out.length; i++) {
|
|
out[i] = fact.copyConstructor(out[i]);
|
|
}
|
|
return out;
|
|
}
|
|
|
|
private native Field[] getDeclaredFields0(boolean publicOnly);
|
|
private native Method[] getDeclaredMethods0(boolean publicOnly);
|
|
private native Constructor<T>[] getDeclaredConstructors0(boolean publicOnly);
|
|
private native Class<?>[] getDeclaredClasses0();
|
|
@SuppressWarnings("preview")
|
|
private native RecordComponent[] getRecordComponents0();
|
|
private native boolean isRecord0();
|
|
|
|
/**
|
|
* Helper method to get the method name from arguments.
|
|
*/
|
|
private String methodToString(String name, Class<?>[] argTypes) {
|
|
return getName() + '.' + name +
|
|
((argTypes == null || argTypes.length == 0) ?
|
|
"()" :
|
|
Arrays.stream(argTypes)
|
|
.map(c -> c == null ? "null" : c.getName())
|
|
.collect(Collectors.joining(",", "(", ")")));
|
|
}
|
|
|
|
/** use serialVersionUID from JDK 1.1 for interoperability */
|
|
@java.io.Serial
|
|
private static final long serialVersionUID = 3206093459760846163L;
|
|
|
|
|
|
/**
|
|
* Class Class is special cased within the Serialization Stream Protocol.
|
|
*
|
|
* A Class instance is written initially into an ObjectOutputStream in the
|
|
* following format:
|
|
* <pre>
|
|
* {@code TC_CLASS} ClassDescriptor
|
|
* A ClassDescriptor is a special cased serialization of
|
|
* a {@code java.io.ObjectStreamClass} instance.
|
|
* </pre>
|
|
* A new handle is generated for the initial time the class descriptor
|
|
* is written into the stream. Future references to the class descriptor
|
|
* are written as references to the initial class descriptor instance.
|
|
*
|
|
* @see java.io.ObjectStreamClass
|
|
*/
|
|
@java.io.Serial
|
|
private static final ObjectStreamField[] serialPersistentFields =
|
|
new ObjectStreamField[0];
|
|
|
|
|
|
/**
|
|
* Returns the assertion status that would be assigned to this
|
|
* class if it were to be initialized at the time this method is invoked.
|
|
* If this class has had its assertion status set, the most recent
|
|
* setting will be returned; otherwise, if any package default assertion
|
|
* status pertains to this class, the most recent setting for the most
|
|
* specific pertinent package default assertion status is returned;
|
|
* otherwise, if this class is not a system class (i.e., it has a
|
|
* class loader) its class loader's default assertion status is returned;
|
|
* otherwise, the system class default assertion status is returned.
|
|
*
|
|
* @apiNote
|
|
* Few programmers will have any need for this method; it is provided
|
|
* for the benefit of the JDK itself. (It allows a class to determine at
|
|
* the time that it is initialized whether assertions should be enabled.)
|
|
* Note that this method is not guaranteed to return the actual
|
|
* assertion status that was (or will be) associated with the specified
|
|
* class when it was (or will be) initialized.
|
|
*
|
|
* @return the desired assertion status of the specified class.
|
|
* @see java.lang.ClassLoader#setClassAssertionStatus
|
|
* @see java.lang.ClassLoader#setPackageAssertionStatus
|
|
* @see java.lang.ClassLoader#setDefaultAssertionStatus
|
|
* @since 1.4
|
|
*/
|
|
public boolean desiredAssertionStatus() {
|
|
ClassLoader loader = getClassLoader0();
|
|
// If the loader is null this is a system class, so ask the VM
|
|
if (loader == null)
|
|
return desiredAssertionStatus0(this);
|
|
|
|
// If the classloader has been initialized with the assertion
|
|
// directives, ask it. Otherwise, ask the VM.
|
|
synchronized(loader.assertionLock) {
|
|
if (loader.classAssertionStatus != null) {
|
|
return loader.desiredAssertionStatus(getName());
|
|
}
|
|
}
|
|
return desiredAssertionStatus0(this);
|
|
}
|
|
|
|
// Retrieves the desired assertion status of this class from the VM
|
|
private static native boolean desiredAssertionStatus0(Class<?> clazz);
|
|
|
|
/**
|
|
* Returns true if and only if this class was declared as an enum in the
|
|
* source code.
|
|
*
|
|
* Note that {@link java.lang.Enum} is not itself an enum type.
|
|
*
|
|
* Also note that if an enum constant is declared with a class body,
|
|
* the class of that enum constant object is an anonymous class
|
|
* and <em>not</em> the class of the declaring enum type. The
|
|
* {@link Enum#getDeclaringClass} method of an enum constant can
|
|
* be used to get the class of the enum type declaring the
|
|
* constant.
|
|
*
|
|
* @return true if and only if this class was declared as an enum in the
|
|
* source code
|
|
* @since 1.5
|
|
* @jls 8.9.1 Enum Constants
|
|
*/
|
|
public boolean isEnum() {
|
|
// An enum must both directly extend java.lang.Enum and have
|
|
// the ENUM bit set; classes for specialized enum constants
|
|
// don't do the former.
|
|
return (this.getModifiers() & ENUM) != 0 &&
|
|
this.getSuperclass() == java.lang.Enum.class;
|
|
}
|
|
|
|
/**
|
|
* Returns {@code true} if and only if this class is a record class.
|
|
*
|
|
* <p> The {@linkplain #getSuperclass() direct superclass} of a record
|
|
* class is {@code java.lang.Record}. A record class has (possibly zero)
|
|
* record components, that is, {@link #getRecordComponents()} returns a
|
|
* non-null value.
|
|
*
|
|
* <p> Note that class {@link Record} is not a record type and thus invoking
|
|
* this method on class {@code Record} returns {@code false}.
|
|
*
|
|
* @return true if and only if this class is a record class, otherwise false
|
|
* @jls 8.10 Record Types
|
|
* @since 16
|
|
*/
|
|
public boolean isRecord() {
|
|
return getSuperclass() == java.lang.Record.class && isRecord0();
|
|
}
|
|
|
|
// Fetches the factory for reflective objects
|
|
private static ReflectionFactory getReflectionFactory() {
|
|
if (reflectionFactory == null) {
|
|
reflectionFactory =
|
|
java.security.AccessController.doPrivileged
|
|
(new ReflectionFactory.GetReflectionFactoryAction());
|
|
}
|
|
return reflectionFactory;
|
|
}
|
|
private static ReflectionFactory reflectionFactory;
|
|
|
|
/**
|
|
* Returns the elements of this enum class or null if this
|
|
* Class object does not represent an enum type.
|
|
*
|
|
* @return an array containing the values comprising the enum class
|
|
* represented by this {@code Class} object in the order they're
|
|
* declared, or null if this {@code Class} object does not
|
|
* represent an enum type
|
|
* @since 1.5
|
|
*/
|
|
public T[] getEnumConstants() {
|
|
T[] values = getEnumConstantsShared();
|
|
return (values != null) ? values.clone() : null;
|
|
}
|
|
|
|
/**
|
|
* Returns the elements of this enum class or null if this
|
|
* Class object does not represent an enum type;
|
|
* identical to getEnumConstants except that the result is
|
|
* uncloned, cached, and shared by all callers.
|
|
*/
|
|
T[] getEnumConstantsShared() {
|
|
T[] constants = enumConstants;
|
|
if (constants == null) {
|
|
if (!isEnum()) return null;
|
|
try {
|
|
final Method values = getMethod("values");
|
|
java.security.AccessController.doPrivileged(
|
|
new java.security.PrivilegedAction<>() {
|
|
public Void run() {
|
|
values.setAccessible(true);
|
|
return null;
|
|
}
|
|
});
|
|
@SuppressWarnings("unchecked")
|
|
T[] temporaryConstants = (T[])values.invoke(null);
|
|
enumConstants = constants = temporaryConstants;
|
|
}
|
|
// These can happen when users concoct enum-like classes
|
|
// that don't comply with the enum spec.
|
|
catch (InvocationTargetException | NoSuchMethodException |
|
|
IllegalAccessException ex) { return null; }
|
|
}
|
|
return constants;
|
|
}
|
|
private transient volatile T[] enumConstants;
|
|
|
|
/**
|
|
* Returns a map from simple name to enum constant. This package-private
|
|
* method is used internally by Enum to implement
|
|
* {@code public static <T extends Enum<T>> T valueOf(Class<T>, String)}
|
|
* efficiently. Note that the map is returned by this method is
|
|
* created lazily on first use. Typically it won't ever get created.
|
|
*/
|
|
Map<String, T> enumConstantDirectory() {
|
|
Map<String, T> directory = enumConstantDirectory;
|
|
if (directory == null) {
|
|
T[] universe = getEnumConstantsShared();
|
|
if (universe == null)
|
|
throw new IllegalArgumentException(
|
|
getName() + " is not an enum type");
|
|
directory = new HashMap<>((int)(universe.length / 0.75f) + 1);
|
|
for (T constant : universe) {
|
|
directory.put(((Enum<?>)constant).name(), constant);
|
|
}
|
|
enumConstantDirectory = directory;
|
|
}
|
|
return directory;
|
|
}
|
|
private transient volatile Map<String, T> enumConstantDirectory;
|
|
|
|
/**
|
|
* Casts an object to the class or interface represented
|
|
* by this {@code Class} object.
|
|
*
|
|
* @param obj the object to be cast
|
|
* @return the object after casting, or null if obj is null
|
|
*
|
|
* @throws ClassCastException if the object is not
|
|
* null and is not assignable to the type T.
|
|
*
|
|
* @since 1.5
|
|
*/
|
|
@SuppressWarnings("unchecked")
|
|
@IntrinsicCandidate
|
|
public T cast(Object obj) {
|
|
if (obj != null && !isInstance(obj))
|
|
throw new ClassCastException(cannotCastMsg(obj));
|
|
return (T) obj;
|
|
}
|
|
|
|
private String cannotCastMsg(Object obj) {
|
|
return "Cannot cast " + obj.getClass().getName() + " to " + getName();
|
|
}
|
|
|
|
/**
|
|
* Casts this {@code Class} object to represent a subclass of the class
|
|
* represented by the specified class object. Checks that the cast
|
|
* is valid, and throws a {@code ClassCastException} if it is not. If
|
|
* this method succeeds, it always returns a reference to this {@code Class} object.
|
|
*
|
|
* <p>This method is useful when a client needs to "narrow" the type of
|
|
* a {@code Class} object to pass it to an API that restricts the
|
|
* {@code Class} objects that it is willing to accept. A cast would
|
|
* generate a compile-time warning, as the correctness of the cast
|
|
* could not be checked at runtime (because generic types are implemented
|
|
* by erasure).
|
|
*
|
|
* @param <U> the type to cast this {@code Class} object to
|
|
* @param clazz the class of the type to cast this {@code Class} object to
|
|
* @return this {@code Class} object, cast to represent a subclass of
|
|
* the specified class object.
|
|
* @throws ClassCastException if this {@code Class} object does not
|
|
* represent a subclass of the specified class (here "subclass" includes
|
|
* the class itself).
|
|
* @since 1.5
|
|
*/
|
|
@SuppressWarnings("unchecked")
|
|
public <U> Class<? extends U> asSubclass(Class<U> clazz) {
|
|
if (clazz.isAssignableFrom(this))
|
|
return (Class<? extends U>) this;
|
|
else
|
|
throw new ClassCastException(this.toString());
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
* <p>Note that any annotation returned by this method is a
|
|
* declaration annotation.
|
|
*
|
|
* @throws NullPointerException {@inheritDoc}
|
|
* @since 1.5
|
|
*/
|
|
@Override
|
|
@SuppressWarnings("unchecked")
|
|
public <A extends Annotation> A getAnnotation(Class<A> annotationClass) {
|
|
Objects.requireNonNull(annotationClass);
|
|
|
|
return (A) annotationData().annotations.get(annotationClass);
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
* @throws NullPointerException {@inheritDoc}
|
|
* @since 1.5
|
|
*/
|
|
@Override
|
|
public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) {
|
|
return GenericDeclaration.super.isAnnotationPresent(annotationClass);
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
* <p>Note that any annotations returned by this method are
|
|
* declaration annotations.
|
|
*
|
|
* @throws NullPointerException {@inheritDoc}
|
|
* @since 1.8
|
|
*/
|
|
@Override
|
|
public <A extends Annotation> A[] getAnnotationsByType(Class<A> annotationClass) {
|
|
Objects.requireNonNull(annotationClass);
|
|
|
|
AnnotationData annotationData = annotationData();
|
|
return AnnotationSupport.getAssociatedAnnotations(annotationData.declaredAnnotations,
|
|
this,
|
|
annotationClass);
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
* <p>Note that any annotations returned by this method are
|
|
* declaration annotations.
|
|
*
|
|
* @since 1.5
|
|
*/
|
|
@Override
|
|
public Annotation[] getAnnotations() {
|
|
return AnnotationParser.toArray(annotationData().annotations);
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
* <p>Note that any annotation returned by this method is a
|
|
* declaration annotation.
|
|
*
|
|
* @throws NullPointerException {@inheritDoc}
|
|
* @since 1.8
|
|
*/
|
|
@Override
|
|
@SuppressWarnings("unchecked")
|
|
public <A extends Annotation> A getDeclaredAnnotation(Class<A> annotationClass) {
|
|
Objects.requireNonNull(annotationClass);
|
|
|
|
return (A) annotationData().declaredAnnotations.get(annotationClass);
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
* <p>Note that any annotations returned by this method are
|
|
* declaration annotations.
|
|
*
|
|
* @throws NullPointerException {@inheritDoc}
|
|
* @since 1.8
|
|
*/
|
|
@Override
|
|
public <A extends Annotation> A[] getDeclaredAnnotationsByType(Class<A> annotationClass) {
|
|
Objects.requireNonNull(annotationClass);
|
|
|
|
return AnnotationSupport.getDirectlyAndIndirectlyPresent(annotationData().declaredAnnotations,
|
|
annotationClass);
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
* <p>Note that any annotations returned by this method are
|
|
* declaration annotations.
|
|
*
|
|
* @since 1.5
|
|
*/
|
|
@Override
|
|
public Annotation[] getDeclaredAnnotations() {
|
|
return AnnotationParser.toArray(annotationData().declaredAnnotations);
|
|
}
|
|
|
|
// annotation data that might get invalidated when JVM TI RedefineClasses() is called
|
|
private static class AnnotationData {
|
|
final Map<Class<? extends Annotation>, Annotation> annotations;
|
|
final Map<Class<? extends Annotation>, Annotation> declaredAnnotations;
|
|
|
|
// Value of classRedefinedCount when we created this AnnotationData instance
|
|
final int redefinedCount;
|
|
|
|
AnnotationData(Map<Class<? extends Annotation>, Annotation> annotations,
|
|
Map<Class<? extends Annotation>, Annotation> declaredAnnotations,
|
|
int redefinedCount) {
|
|
this.annotations = annotations;
|
|
this.declaredAnnotations = declaredAnnotations;
|
|
this.redefinedCount = redefinedCount;
|
|
}
|
|
}
|
|
|
|
// Annotations cache
|
|
@SuppressWarnings("UnusedDeclaration")
|
|
private transient volatile AnnotationData annotationData;
|
|
|
|
private AnnotationData annotationData() {
|
|
while (true) { // retry loop
|
|
AnnotationData annotationData = this.annotationData;
|
|
int classRedefinedCount = this.classRedefinedCount;
|
|
if (annotationData != null &&
|
|
annotationData.redefinedCount == classRedefinedCount) {
|
|
return annotationData;
|
|
}
|
|
// null or stale annotationData -> optimistically create new instance
|
|
AnnotationData newAnnotationData = createAnnotationData(classRedefinedCount);
|
|
// try to install it
|
|
if (Atomic.casAnnotationData(this, annotationData, newAnnotationData)) {
|
|
// successfully installed new AnnotationData
|
|
return newAnnotationData;
|
|
}
|
|
}
|
|
}
|
|
|
|
private AnnotationData createAnnotationData(int classRedefinedCount) {
|
|
Map<Class<? extends Annotation>, Annotation> declaredAnnotations =
|
|
AnnotationParser.parseAnnotations(getRawAnnotations(), getConstantPool(), this);
|
|
Class<?> superClass = getSuperclass();
|
|
Map<Class<? extends Annotation>, Annotation> annotations = null;
|
|
if (superClass != null) {
|
|
Map<Class<? extends Annotation>, Annotation> superAnnotations =
|
|
superClass.annotationData().annotations;
|
|
for (Map.Entry<Class<? extends Annotation>, Annotation> e : superAnnotations.entrySet()) {
|
|
Class<? extends Annotation> annotationClass = e.getKey();
|
|
if (AnnotationType.getInstance(annotationClass).isInherited()) {
|
|
if (annotations == null) { // lazy construction
|
|
annotations = new LinkedHashMap<>((Math.max(
|
|
declaredAnnotations.size(),
|
|
Math.min(12, declaredAnnotations.size() + superAnnotations.size())
|
|
) * 4 + 2) / 3
|
|
);
|
|
}
|
|
annotations.put(annotationClass, e.getValue());
|
|
}
|
|
}
|
|
}
|
|
if (annotations == null) {
|
|
// no inherited annotations -> share the Map with declaredAnnotations
|
|
annotations = declaredAnnotations;
|
|
} else {
|
|
// at least one inherited annotation -> declared may override inherited
|
|
annotations.putAll(declaredAnnotations);
|
|
}
|
|
return new AnnotationData(annotations, declaredAnnotations, classRedefinedCount);
|
|
}
|
|
|
|
// Annotation types cache their internal (AnnotationType) form
|
|
|
|
@SuppressWarnings("UnusedDeclaration")
|
|
private transient volatile AnnotationType annotationType;
|
|
|
|
boolean casAnnotationType(AnnotationType oldType, AnnotationType newType) {
|
|
return Atomic.casAnnotationType(this, oldType, newType);
|
|
}
|
|
|
|
AnnotationType getAnnotationType() {
|
|
return annotationType;
|
|
}
|
|
|
|
Map<Class<? extends Annotation>, Annotation> getDeclaredAnnotationMap() {
|
|
return annotationData().declaredAnnotations;
|
|
}
|
|
|
|
/* Backing store of user-defined values pertaining to this class.
|
|
* Maintained by the ClassValue class.
|
|
*/
|
|
transient ClassValue.ClassValueMap classValueMap;
|
|
|
|
/**
|
|
* Returns an {@code AnnotatedType} object that represents the use of a
|
|
* type to specify the superclass of the entity represented by this {@code
|
|
* Class} object. (The <em>use</em> of type Foo to specify the superclass
|
|
* in '... extends Foo' is distinct from the <em>declaration</em> of type
|
|
* Foo.)
|
|
*
|
|
* <p> If this {@code Class} object represents a type whose declaration
|
|
* does not explicitly indicate an annotated superclass, then the return
|
|
* value is an {@code AnnotatedType} object representing an element with no
|
|
* annotations.
|
|
*
|
|
* <p> If this {@code Class} represents either the {@code Object} class, an
|
|
* interface type, an array type, a primitive type, or void, the return
|
|
* value is {@code null}.
|
|
*
|
|
* @return an object representing the superclass
|
|
* @since 1.8
|
|
*/
|
|
public AnnotatedType getAnnotatedSuperclass() {
|
|
if (this == Object.class ||
|
|
isInterface() ||
|
|
isArray() ||
|
|
isPrimitive() ||
|
|
this == Void.TYPE) {
|
|
return null;
|
|
}
|
|
|
|
return TypeAnnotationParser.buildAnnotatedSuperclass(getRawTypeAnnotations(), getConstantPool(), this);
|
|
}
|
|
|
|
/**
|
|
* Returns an array of {@code AnnotatedType} objects that represent the use
|
|
* of types to specify superinterfaces of the entity represented by this
|
|
* {@code Class} object. (The <em>use</em> of type Foo to specify a
|
|
* superinterface in '... implements Foo' is distinct from the
|
|
* <em>declaration</em> of type Foo.)
|
|
*
|
|
* <p> If this {@code Class} object represents a class, the return value is
|
|
* an array containing objects representing the uses of interface types to
|
|
* specify interfaces implemented by the class. The order of the objects in
|
|
* the array corresponds to the order of the interface types used in the
|
|
* 'implements' clause of the declaration of this {@code Class} object.
|
|
*
|
|
* <p> If this {@code Class} object represents an interface, the return
|
|
* value is an array containing objects representing the uses of interface
|
|
* types to specify interfaces directly extended by the interface. The
|
|
* order of the objects in the array corresponds to the order of the
|
|
* interface types used in the 'extends' clause of the declaration of this
|
|
* {@code Class} object.
|
|
*
|
|
* <p> If this {@code Class} object represents a class or interface whose
|
|
* declaration does not explicitly indicate any annotated superinterfaces,
|
|
* the return value is an array of length 0.
|
|
*
|
|
* <p> If this {@code Class} object represents either the {@code Object}
|
|
* class, an array type, a primitive type, or void, the return value is an
|
|
* array of length 0.
|
|
*
|
|
* @return an array representing the superinterfaces
|
|
* @since 1.8
|
|
*/
|
|
public AnnotatedType[] getAnnotatedInterfaces() {
|
|
return TypeAnnotationParser.buildAnnotatedInterfaces(getRawTypeAnnotations(), getConstantPool(), this);
|
|
}
|
|
|
|
private native Class<?> getNestHost0();
|
|
|
|
/**
|
|
* Returns the nest host of the <a href=#nest>nest</a> to which the class
|
|
* or interface represented by this {@code Class} object belongs.
|
|
* Every class and interface belongs to exactly one nest.
|
|
*
|
|
* If the nest host of this class or interface has previously
|
|
* been determined, then this method returns the nest host.
|
|
* If the nest host of this class or interface has
|
|
* not previously been determined, then this method determines the nest
|
|
* host using the algorithm of JVMS 5.4.4, and returns it.
|
|
*
|
|
* Often, a class or interface belongs to a nest consisting only of itself,
|
|
* in which case this method returns {@code this} to indicate that the class
|
|
* or interface is the nest host.
|
|
*
|
|
* <p>If this {@code Class} object represents a primitive type, an array type,
|
|
* or {@code void}, then this method returns {@code this},
|
|
* indicating that the represented entity belongs to the nest consisting only of
|
|
* itself, and is the nest host.
|
|
*
|
|
* @return the nest host of this class or interface
|
|
*
|
|
* @throws SecurityException
|
|
* If the returned class is not the current class, and
|
|
* if a security manager, <i>s</i>, is present and the caller's
|
|
* class loader is not the same as or an ancestor of the class
|
|
* loader for the returned class and invocation of {@link
|
|
* SecurityManager#checkPackageAccess s.checkPackageAccess()}
|
|
* denies access to the package of the returned class
|
|
* @since 11
|
|
* @jvms 4.7.28 The {@code NestHost} Attribute
|
|
* @jvms 4.7.29 The {@code NestMembers} Attribute
|
|
* @jvms 5.4.4 Access Control
|
|
*/
|
|
@CallerSensitive
|
|
public Class<?> getNestHost() {
|
|
if (isPrimitive() || isArray()) {
|
|
return this;
|
|
}
|
|
|
|
Class<?> host = getNestHost0();
|
|
if (host == this) {
|
|
return this;
|
|
}
|
|
// returning a different class requires a security check
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
checkPackageAccess(sm,
|
|
ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
|
|
}
|
|
return host;
|
|
}
|
|
|
|
/**
|
|
* Determines if the given {@code Class} is a nestmate of the
|
|
* class or interface represented by this {@code Class} object.
|
|
* Two classes or interfaces are nestmates
|
|
* if they have the same {@linkplain #getNestHost() nest host}.
|
|
*
|
|
* @param c the class to check
|
|
* @return {@code true} if this class and {@code c} are members of
|
|
* the same nest; and {@code false} otherwise.
|
|
*
|
|
* @since 11
|
|
*/
|
|
public boolean isNestmateOf(Class<?> c) {
|
|
if (this == c) {
|
|
return true;
|
|
}
|
|
if (isPrimitive() || isArray() ||
|
|
c.isPrimitive() || c.isArray()) {
|
|
return false;
|
|
}
|
|
|
|
return getNestHost() == c.getNestHost();
|
|
}
|
|
|
|
private native Class<?>[] getNestMembers0();
|
|
|
|
/**
|
|
* Returns an array containing {@code Class} objects representing all the
|
|
* classes and interfaces that are members of the nest to which the class
|
|
* or interface represented by this {@code Class} object belongs.
|
|
*
|
|
* First, this method obtains the {@linkplain #getNestHost() nest host},
|
|
* {@code H}, of the nest to which the class or interface represented by
|
|
* this {@code Class} object belongs. The zeroth element of the returned
|
|
* array is {@code H}.
|
|
*
|
|
* Then, for each class or interface {@code C} which is recorded by {@code H}
|
|
* as being a member of its nest, this method attempts to obtain the {@code Class}
|
|
* object for {@code C} (using {@linkplain #getClassLoader() the defining class
|
|
* loader} of the current {@code Class} object), and then obtains the
|
|
* {@linkplain #getNestHost() nest host} of the nest to which {@code C} belongs.
|
|
* The classes and interfaces which are recorded by {@code H} as being members
|
|
* of its nest, and for which {@code H} can be determined as their nest host,
|
|
* are indicated by subsequent elements of the returned array. The order of
|
|
* such elements is unspecified. Duplicates are permitted.
|
|
*
|
|
* <p>If this {@code Class} object represents a primitive type, an array type,
|
|
* or {@code void}, then this method returns a single-element array containing
|
|
* {@code this}.
|
|
*
|
|
* @apiNote
|
|
* The returned array includes only the nest members recorded in the {@code NestMembers}
|
|
* attribute, and not any hidden classes that were added to the nest via
|
|
* {@link MethodHandles.Lookup#defineHiddenClass(byte[], boolean, MethodHandles.Lookup.ClassOption...)
|
|
* Lookup::defineHiddenClass}.
|
|
*
|
|
* @return an array of all classes and interfaces in the same nest as
|
|
* this class or interface
|
|
*
|
|
* @throws SecurityException
|
|
* If any returned class is not the current class, and
|
|
* if a security manager, <i>s</i>, is present and the caller's
|
|
* class loader is not the same as or an ancestor of the class
|
|
* loader for that returned class and invocation of {@link
|
|
* SecurityManager#checkPackageAccess s.checkPackageAccess()}
|
|
* denies access to the package of that returned class
|
|
*
|
|
* @since 11
|
|
* @see #getNestHost()
|
|
* @jvms 4.7.28 The {@code NestHost} Attribute
|
|
* @jvms 4.7.29 The {@code NestMembers} Attribute
|
|
*/
|
|
@CallerSensitive
|
|
public Class<?>[] getNestMembers() {
|
|
if (isPrimitive() || isArray()) {
|
|
return new Class<?>[] { this };
|
|
}
|
|
Class<?>[] members = getNestMembers0();
|
|
// Can't actually enable this due to bootstrapping issues
|
|
// assert(members.length != 1 || members[0] == this); // expected invariant from VM
|
|
|
|
if (members.length > 1) {
|
|
// If we return anything other than the current class we need
|
|
// a security check
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
checkPackageAccess(sm,
|
|
ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
|
|
}
|
|
}
|
|
return members;
|
|
}
|
|
|
|
/**
|
|
* Returns the descriptor string of the entity (class, interface, array class,
|
|
* primitive type, or {@code void}) represented by this {@code Class} object.
|
|
*
|
|
* <p> If this {@code Class} object represents a class or interface,
|
|
* not an array class, then:
|
|
* <ul>
|
|
* <li> If the class or interface is not {@linkplain Class#isHidden() hidden},
|
|
* then the result is a field descriptor (JVMS {@jvms 4.3.2})
|
|
* for the class or interface. Calling
|
|
* {@link ClassDesc#ofDescriptor(String) ClassDesc::ofDescriptor}
|
|
* with the result descriptor string produces a {@link ClassDesc ClassDesc}
|
|
* describing this class or interface.
|
|
* <li> If the class or interface is {@linkplain Class#isHidden() hidden},
|
|
* then the result is a string of the form:
|
|
* <blockquote>
|
|
* {@code "L" +} <em>N</em> {@code + "." + <suffix> + ";"}
|
|
* </blockquote>
|
|
* where <em>N</em> is the <a href="ClassLoader.html#binary-name">binary name</a>
|
|
* encoded in internal form indicated by the {@code class} file passed to
|
|
* {@link MethodHandles.Lookup#defineHiddenClass(byte[], boolean, MethodHandles.Lookup.ClassOption...)
|
|
* Lookup::defineHiddenClass}, and {@code <suffix>} is an unqualified name.
|
|
* A hidden class or interface has no {@linkplain ClassDesc nominal descriptor}.
|
|
* The result string is not a type descriptor.
|
|
* </ul>
|
|
*
|
|
* <p> If this {@code Class} object represents an array class, then
|
|
* the result is a string consisting of one or more '{@code [}' characters
|
|
* representing the depth of the array nesting, followed by the
|
|
* descriptor string of the element type.
|
|
* <ul>
|
|
* <li> If the element type is not a {@linkplain Class#isHidden() hidden} class
|
|
* or interface, then this array class can be described nominally.
|
|
* Calling {@link ClassDesc#ofDescriptor(String) ClassDesc::ofDescriptor}
|
|
* with the result descriptor string produces a {@link ClassDesc ClassDesc}
|
|
* describing this array class.
|
|
* <li> If the element type is a {@linkplain Class#isHidden() hidden} class or
|
|
* interface, then this array class cannot be described nominally.
|
|
* The result string is not a type descriptor.
|
|
* </ul>
|
|
*
|
|
* <p> If this {@code Class} object represents a primitive type or
|
|
* {@code void}, then the result is a field descriptor string which
|
|
* is a one-letter code corresponding to a primitive type or {@code void}
|
|
* ({@code "B", "C", "D", "F", "I", "J", "S", "Z", "V"}) (JVMS {@jvms 4.3.2}).
|
|
*
|
|
* @apiNote
|
|
* This is not a strict inverse of {@link #forName};
|
|
* distinct classes which share a common name but have different class loaders
|
|
* will have identical descriptor strings.
|
|
*
|
|
* @return the descriptor string for this {@code Class} object
|
|
* @jvms 4.3.2 Field Descriptors
|
|
* @since 12
|
|
*/
|
|
@Override
|
|
public String descriptorString() {
|
|
if (isPrimitive())
|
|
return Wrapper.forPrimitiveType(this).basicTypeString();
|
|
|
|
if (isArray()) {
|
|
return "[" + componentType.descriptorString();
|
|
} else if (isHidden()) {
|
|
String name = getName();
|
|
int index = name.indexOf('/');
|
|
return "L" + name.substring(0, index).replace('.', '/')
|
|
+ "." + name.substring(index+1) + ";";
|
|
} else {
|
|
return "L" + getName().replace('.', '/') + ";";
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns the component type of this {@code Class}, if it describes
|
|
* an array type, or {@code null} otherwise.
|
|
*
|
|
* @implSpec
|
|
* Equivalent to {@link Class#getComponentType()}.
|
|
*
|
|
* @return a {@code Class} describing the component type, or {@code null}
|
|
* if this {@code Class} does not describe an array type
|
|
* @since 12
|
|
*/
|
|
@Override
|
|
public Class<?> componentType() {
|
|
return isArray() ? componentType : null;
|
|
}
|
|
|
|
/**
|
|
* Returns a {@code Class} for an array type whose component type
|
|
* is described by this {@linkplain Class}.
|
|
*
|
|
* @return a {@code Class} describing the array type
|
|
* @since 12
|
|
*/
|
|
@Override
|
|
public Class<?> arrayType() {
|
|
return Array.newInstance(this, 0).getClass();
|
|
}
|
|
|
|
/**
|
|
* Returns a nominal descriptor for this instance, if one can be
|
|
* constructed, or an empty {@link Optional} if one cannot be.
|
|
*
|
|
* @return An {@link Optional} containing the resulting nominal descriptor,
|
|
* or an empty {@link Optional} if one cannot be constructed.
|
|
* @since 12
|
|
*/
|
|
@Override
|
|
public Optional<ClassDesc> describeConstable() {
|
|
Class<?> c = isArray() ? elementType() : this;
|
|
return c.isHidden() ? Optional.empty()
|
|
: Optional.of(ClassDesc.ofDescriptor(descriptorString()));
|
|
}
|
|
|
|
/**
|
|
* Returns {@code true} if and only if the underlying class is a hidden class.
|
|
*
|
|
* @return {@code true} if and only if this class is a hidden class.
|
|
*
|
|
* @since 15
|
|
* @see MethodHandles.Lookup#defineHiddenClass
|
|
*/
|
|
@IntrinsicCandidate
|
|
public native boolean isHidden();
|
|
|
|
/**
|
|
* {@preview Associated with sealed classes, a preview feature of the Java language.
|
|
*
|
|
* This method is associated with <i>sealed classes</i>, a preview
|
|
* feature of the Java language. Preview features
|
|
* may be removed in a future release, or upgraded to permanent
|
|
* features of the Java language.}
|
|
*
|
|
* Returns an array containing {@code ClassDesc} objects representing all the
|
|
* direct subclasses or direct implementation classes permitted to extend or
|
|
* implement this class or interface if it is sealed. The order of such elements
|
|
* is unspecified. If this {@code Class} object represents a primitive type,
|
|
* {@code void}, an array type, or a class or interface that is not sealed,
|
|
* an empty array is returned.
|
|
*
|
|
* @return an array of class descriptors of all the permitted subclasses of this class or interface
|
|
*
|
|
* @jls 8.1 Class Declarations
|
|
* @jls 9.1 Interface Declarations
|
|
* @since 15
|
|
*/
|
|
@jdk.internal.PreviewFeature(feature=jdk.internal.PreviewFeature.Feature.SEALED_CLASSES, essentialAPI=false)
|
|
public ClassDesc[] permittedSubclasses() {
|
|
String[] subclassNames;
|
|
if (isArray() || isPrimitive() || (subclassNames = getPermittedSubclasses0()).length == 0) {
|
|
return EMPTY_CLASS_DESC_ARRAY;
|
|
}
|
|
ClassDesc[] constants = new ClassDesc[subclassNames.length];
|
|
int i = 0;
|
|
for (String subclassName : subclassNames) {
|
|
try {
|
|
constants[i++] = ClassDesc.of(subclassName.replace('/', '.'));
|
|
} catch (IllegalArgumentException iae) {
|
|
throw new InternalError("Invalid type in permitted subclasses information: " + subclassName, iae);
|
|
}
|
|
}
|
|
return constants;
|
|
}
|
|
|
|
/**
|
|
* * {@preview Associated with sealed classes, a preview feature of the Java language.
|
|
*
|
|
* This method is associated with <i>sealed classes</i>, a preview
|
|
* feature of the Java language. Preview features
|
|
* may be removed in a future release, or upgraded to permanent
|
|
* features of the Java language.}
|
|
*
|
|
* Returns {@code true} if and only if this {@code Class} object represents a sealed class or interface.
|
|
* If this {@code Class} object represents a primitive type, {@code void}, or an array type, this method returns
|
|
* {@code false}.
|
|
*
|
|
* @return {@code true} if and only if this {@code Class} object represents a sealed class or interface.
|
|
*
|
|
* @jls 8.1 Class Declarations
|
|
* @jls 9.1 Interface Declarations
|
|
* @since 15
|
|
*/
|
|
@jdk.internal.PreviewFeature(feature=jdk.internal.PreviewFeature.Feature.SEALED_CLASSES, essentialAPI=false)
|
|
@SuppressWarnings("preview")
|
|
public boolean isSealed() {
|
|
if (isArray() || isPrimitive()) {
|
|
return false;
|
|
}
|
|
return permittedSubclasses().length != 0;
|
|
}
|
|
|
|
private native String[] getPermittedSubclasses0();
|
|
}
|