77 lines
2.6 KiB
Java
77 lines
2.6 KiB
Java
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/*
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* Copyright (c) 2005, 2010, 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.io;
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import java.util.*;
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import java.io.File;
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/**
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* This class holds a set of filenames to be deleted on VM exit through a shutdown hook.
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* A set is used both to prevent double-insertion of the same file as well as offer
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* quick removal.
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*/
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class DeleteOnExitHook {
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private static LinkedHashSet<String> files = new LinkedHashSet<>();
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static {
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// BEGIN Android-changed: Use Runtime.addShutdownHook() rather than SharedSecrets.
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Runtime.getRuntime().addShutdownHook(new Thread() {
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public void run() {
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runHooks();
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}
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});
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// END Android-changed: Use Runtime.addShutdownHook() rather than SharedSecrets.
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}
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private DeleteOnExitHook() {}
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static synchronized void add(String file) {
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if(files == null) {
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// DeleteOnExitHook is running. Too late to add a file
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throw new IllegalStateException("Shutdown in progress");
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}
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files.add(file);
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}
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static void runHooks() {
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LinkedHashSet<String> theFiles;
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synchronized (DeleteOnExitHook.class) {
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theFiles = files;
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files = null;
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}
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ArrayList<String> toBeDeleted = new ArrayList<>(theFiles);
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// reverse the list to maintain previous jdk deletion order.
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// Last in first deleted.
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Collections.reverse(toBeDeleted);
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for (String filename : toBeDeleted) {
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(new File(filename)).delete();
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}
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}
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}
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