75 lines
2.4 KiB
Java
75 lines
2.4 KiB
Java
|
/*
|
||
|
|
* Copyright 2005-2007 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 java.io;
|
||
|
|
|
||
|
|
import java.util.*;
|
||
|
|
import java.io.File;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* This class holds a set of filenames to be deleted on VM exit through a shutdown hook.
|
||
|
|
* A set is used both to prevent double-insertion of the same file as well as offer
|
||
|
|
* quick removal.
|
||
|
|
*/
|
||
|
|
|
||
|
|
class DeleteOnExitHook {
|
||
|
|
private static DeleteOnExitHook instance = null;
|
||
|
|
|
||
|
|
private static LinkedHashSet<String> files = new LinkedHashSet<String>();
|
||
|
|
|
||
|
|
static DeleteOnExitHook hook() {
|
||
|
|
if (instance == null)
|
||
|
|
instance = new DeleteOnExitHook();
|
||
|
|
|
||
|
|
return instance;
|
||
|
|
}
|
||
|
|
|
||
|
|
private DeleteOnExitHook() {}
|
||
|
|
|
||
|
|
static synchronized void add(String file) {
|
||
|
|
if(files == null)
|
||
|
|
throw new IllegalStateException("Shutdown in progress");
|
||
|
|
|
||
|
|
files.add(file);
|
||
|
|
}
|
||
|
|
|
||
|
|
void run() {
|
||
|
|
LinkedHashSet<String> theFiles;
|
||
|
|
|
||
|
|
synchronized (DeleteOnExitHook.class) {
|
||
|
|
theFiles = files;
|
||
|
|
files = null;
|
||
|
|
}
|
||
|
|
|
||
|
|
ArrayList<String> toBeDeleted = new ArrayList<String>(theFiles);
|
||
|
|
|
||
|
|
// reverse the list to maintain previous jdk deletion order.
|
||
|
|
// Last in first deleted.
|
||
|
|
Collections.reverse(toBeDeleted);
|
||
|
|
for (String filename : toBeDeleted) {
|
||
|
|
(new File(filename)).delete();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|