--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/io/DeleteOnExitHook.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,74 @@
+/*
+ * 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();
+        }
+    }
+}