| /* |
| * 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(); |
| } |
| } |
| } |