1/*
2 * Copyright (C) 2007 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.common.collect;
18
19import com.google.common.annotations.GwtCompatible;
20
21import java.util.concurrent.ConcurrentMap;
22
23/**
24 * A concurrent map which forwards all its method calls to another concurrent
25 * map. Subclasses should override one or more methods to modify the behavior of
26 * the backing map as desired per the <a
27 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
28 *
29 * @author Charles Fry
30 * @since 2.0 (imported from Google Collections Library)
31 */
32@GwtCompatible
33public abstract class ForwardingConcurrentMap<K, V> extends ForwardingMap<K, V>
34    implements ConcurrentMap<K, V> {
35
36  /** Constructor for use by subclasses. */
37  protected ForwardingConcurrentMap() {}
38
39  @Override protected abstract ConcurrentMap<K, V> delegate();
40
41  @Override
42  public V putIfAbsent(K key, V value) {
43    return delegate().putIfAbsent(key, value);
44  }
45
46  @Override
47  public boolean remove(Object key, Object value) {
48    return delegate().remove(key, value);
49  }
50
51  @Override
52  public V replace(K key, V value) {
53    return delegate().replace(key, value);
54  }
55
56  @Override
57  public boolean replace(K key, V oldValue, V newValue) {
58    return delegate().replace(key, oldValue, newValue);
59  }
60
61}
62