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Copyright (C) 2008 Ovea <> Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
package org.testatoo.selenium.server.util;
final class DeleteOnExitHook implements Runnable {
    private static final DeleteOnExitHook instance = new DeleteOnExitHook();
    private final LinkedHashSet<Filefiles = new LinkedHashSet<File>();
    private boolean shutdownInProgress;
    private DeleteOnExitHook() {
        Runtime.getRuntime().addShutdownHook(new Thread(this"DeleteOnExitHookThread"));
    public void run() {
         = true;
        LinkedHashSet<FiletheFiles = ;
        ArrayList<FiletoBeDeleted = new ArrayList<File>(theFiles);
        // reverse the list to maintain previous jdk deletion order.
        // Last in first deleted.
        for (File file : toBeDeleted) {
            //noinspection ResultOfMethodCallIgnored
    void deleteSubFolders(File file) {
        File[] files = file.listFiles();
        for (File f : files) {
            if (f.isDirectory()) {
            //noinspection ResultOfMethodCallIgnored
    public DeleteOnExitHook add(File file) {
        if (!) {
        return this;
    public static DeleteOnExitHook instance() {
        return ;
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