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diff --git a/guava/src/com/google/common/collect/ForwardingConcurrentMap.java b/guava/src/com/google/common/collect/ForwardingConcurrentMap.java
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+++ b/guava/src/com/google/common/collect/ForwardingConcurrentMap.java
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+/*
+ * Copyright (C) 2007 The Guava Authors
+ *
+ * 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
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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 com.google.common.collect;
+
+import com.google.common.annotations.GwtCompatible;
+
+import java.util.concurrent.ConcurrentMap;
+
+/**
+ * A concurrent map which forwards all its method calls to another concurrent
+ * map. Subclasses should override one or more methods to modify the behavior of
+ * the backing map as desired per the <a
+ * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
+ *
+ * @author Charles Fry
+ * @since 2.0 (imported from Google Collections Library)
+ */
+@GwtCompatible
+public abstract class ForwardingConcurrentMap<K, V> extends ForwardingMap<K, V>
+    implements ConcurrentMap<K, V> {
+
+  /** Constructor for use by subclasses. */
+  protected ForwardingConcurrentMap() {}
+
+  @Override protected abstract ConcurrentMap<K, V> delegate();
+
+  @Override
+  public V putIfAbsent(K key, V value) {
+    return delegate().putIfAbsent(key, value);
+  }
+
+  @Override
+  public boolean remove(Object key, Object value) {
+    return delegate().remove(key, value);
+  }
+
+  @Override
+  public V replace(K key, V value) {
+    return delegate().replace(key, value);
+  }
+
+  @Override
+  public boolean replace(K key, V oldValue, V newValue) {
+    return delegate().replace(key, oldValue, newValue);
+  }
+
+}