1   /*
2    * Copyright (C) 2010 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  
17  package com.google.common.collect;
18  
19  import com.google.common.annotations.GwtCompatible;
20  
21  import java.util.Map.Entry;
22  import java.util.Set;
23  
24  import javax.annotation.Nullable;
25  
26  /**
27   * A set multimap which forwards all its method calls to another set multimap.
28   * Subclasses should override one or more methods to modify the behavior of
29   * the backing multimap as desired per the <a
30   * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
31   *
32   * @author Kurt Alfred Kluever
33   * @since 3.0
34   */
35  @GwtCompatible
36  public abstract class ForwardingSetMultimap<K, V>
37      extends ForwardingMultimap<K, V> implements SetMultimap<K, V> {
38  
39    @Override protected abstract SetMultimap<K, V> delegate();
40  
41    @Override public Set<Entry<K, V>> entries() {
42      return delegate().entries();
43    }
44  
45    @Override public Set<V> get(@Nullable K key) {
46      return delegate().get(key);
47    }
48  
49    @Override public Set<V> removeAll(@Nullable Object key) {
50      return delegate().removeAll(key);
51    }
52  
53    @Override public Set<V> replaceValues(K key, Iterable<? extends V> values) {
54      return delegate().replaceValues(key, values);
55    }
56  }