53 lines
2.0 KiB
Java
53 lines
2.0 KiB
Java
|
/*
|
||
|
|
* Copyright 2004 Sun Microsystems, Inc. All Rights Reserved.
|
||
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
||
|
|
*
|
||
|
|
* This code is free software; you can redistribute it and/or modify it
|
||
|
|
* under the terms of the GNU General Public License version 2 only, as
|
||
|
|
* published by the Free Software Foundation. Sun designates this
|
||
|
|
* particular file as subject to the "Classpath" exception as provided
|
||
|
|
* by Sun in the LICENSE file that accompanied this code.
|
||
|
|
*
|
||
|
|
* This code is distributed in the hope that it will be useful, but WITHOUT
|
||
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
||
|
|
* version 2 for more details (a copy is included in the LICENSE file that
|
||
|
|
* accompanied this code).
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License version
|
||
|
|
* 2 along with this work; if not, write to the Free Software Foundation,
|
||
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
||
|
|
*
|
||
|
|
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
|
||
|
|
* CA 95054 USA or visit www.sun.com if you need additional information or
|
||
|
|
* have any questions.
|
||
|
|
*/
|
||
|
|
|
||
|
|
package sun.reflect;
|
||
|
|
|
||
|
|
import java.lang.reflect.Field;
|
||
|
|
import java.lang.reflect.Modifier;
|
||
|
|
import sun.misc.Unsafe;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Base class for sun.misc.Unsafe-based FieldAccessors for fields with
|
||
|
|
* final or volatile qualifiers. These differ from unqualified
|
||
|
|
* versions in that (1) they check for read-only status (2) they use
|
||
|
|
* the volatile forms of Unsafe get/put methods. (When accessed via
|
||
|
|
* reflection, finals act as slightly "lighter" forms of volatiles. So
|
||
|
|
* the volatile forms are heavier than necessary in terms of
|
||
|
|
* underlying reordering rules and memory barriers, but preserve
|
||
|
|
* correctness.)
|
||
|
|
*/
|
||
|
|
|
||
|
|
abstract class UnsafeQualifiedFieldAccessorImpl
|
||
|
|
extends UnsafeFieldAccessorImpl
|
||
|
|
{
|
||
|
|
protected final boolean isReadOnly;
|
||
|
|
|
||
|
|
UnsafeQualifiedFieldAccessorImpl(Field field, boolean isReadOnly) {
|
||
|
|
super(field);
|
||
|
|
this.isReadOnly = isReadOnly;
|
||
|
|
}
|
||
|
|
}
|