--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/util/concurrent/locks/ReentrantReadWriteLock/RWMap.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,114 @@
+/*
+ * 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.
+ *
+ * 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.
+ */
+
+/*
+ * This file is available under and governed by the GNU General Public
+ * License version 2 only, as published by the Free Software Foundation.
+ * However, the following notice accompanied the original version of this
+ * file:
+ *
+ * Written by Doug Lea with assistance from members of JCP JSR-166
+ * Expert Group and released to the public domain, as explained at
+ * http://creativecommons.org/licenses/publicdomain
+ */
+import java.util.*;
+import java.util.concurrent.*;
+import java.util.concurrent.locks.*;
+
+
+/**
+ * This is an incomplete implementation of a wrapper class
+ * that places read-write locks around unsynchronized Maps.
+ * Exists as a sample input for MapLoops test.
+ */
+
+public class RWMap implements Map {
+    private final Map m;
+    private final ReentrantReadWriteLock rwl = new ReentrantReadWriteLock();
+
+    public RWMap(Map m) {
+        if (m == null)
+            throw new NullPointerException();
+        this.m = m;
+    }
+
+    public RWMap() {
+        this(new TreeMap()); // use TreeMap by default
+    }
+
+    public int size() {
+        rwl.readLock().lock(); try {return m.size();} finally { rwl.readLock().unlock(); }
+    }
+    public boolean isEmpty(){
+        rwl.readLock().lock(); try {return m.isEmpty();} finally { rwl.readLock().unlock(); }
+    }
+
+    public Object get(Object key) {
+        rwl.readLock().lock(); try {return m.get(key);} finally { rwl.readLock().unlock(); }
+    }
+
+    public boolean containsKey(Object key) {
+        rwl.readLock().lock(); try {return m.containsKey(key);} finally { rwl.readLock().unlock(); }
+    }
+    public boolean containsValue(Object value){
+        rwl.readLock().lock(); try {return m.containsValue(value);} finally { rwl.readLock().unlock(); }
+    }
+
+
+    public Set keySet() { // Not implemented
+        return null;
+    }
+
+    public Set entrySet() { // Not implemented
+        return null;
+    }
+
+    public Collection values() { // Not implemented
+        return null;
+    }
+
+    public boolean equals(Object o) {
+        rwl.readLock().lock(); try {return m.equals(o);} finally { rwl.readLock().unlock(); }
+    }
+    public int hashCode() {
+        rwl.readLock().lock(); try {return m.hashCode();} finally { rwl.readLock().unlock(); }
+    }
+    public String toString() {
+        rwl.readLock().lock(); try {return m.toString();} finally { rwl.readLock().unlock(); }
+    }
+
+
+
+    public Object put(Object key, Object value) {
+        rwl.writeLock().lock(); try {return m.put(key, value);} finally { rwl.writeLock().unlock(); }
+    }
+    public Object remove(Object key) {
+        rwl.writeLock().lock(); try {return m.remove(key);} finally { rwl.writeLock().unlock(); }
+    }
+    public void putAll(Map map) {
+        rwl.writeLock().lock(); try {m.putAll(map);} finally { rwl.writeLock().unlock(); }
+    }
+    public void clear() {
+        rwl.writeLock().lock(); try {m.clear();} finally { rwl.writeLock().unlock(); }
+    }
+
+}