1/*
2 * Copyright (C) 2007 Google Inc.
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.Set;
22
23import javax.annotation.Nullable;
24
25/**
26 * A multiset which forwards all its method calls to another multiset.
27 * Subclasses should override one or more methods to modify the behavior of the
28 * backing multiset as desired per the <a
29 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
30 *
31 * @see ForwardingObject
32 * @author Kevin Bourrillion
33 * @since 2010.01.04 <b>stable</b> (imported from Google Collections Library)
34 */
35@GwtCompatible
36public abstract class ForwardingMultiset<E> extends ForwardingCollection<E>
37    implements Multiset<E> {
38
39  @Override protected abstract Multiset<E> delegate();
40
41  public int count(Object element) {
42    return delegate().count(element);
43  }
44
45  public int add(E element, int occurrences) {
46    return delegate().add(element, occurrences);
47  }
48
49  public int remove(Object element, int occurrences) {
50    return delegate().remove(element, occurrences);
51  }
52
53  public Set<E> elementSet() {
54    return delegate().elementSet();
55  }
56
57  public Set<Entry<E>> entrySet() {
58    return delegate().entrySet();
59  }
60
61  @Override public boolean equals(@Nullable Object object) {
62    return object == this || delegate().equals(object);
63  }
64
65  @Override public int hashCode() {
66    return delegate().hashCode();
67  }
68
69  public int setCount(E element, int count) {
70    return delegate().setCount(element, count);
71  }
72
73  public boolean setCount(E element, int oldCount, int newCount) {
74    return delegate().setCount(element, oldCount, newCount);
75  }
76}
77