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.Collection;
22import java.util.Iterator;
23
24/**
25 * A collection which forwards all its method calls to another collection.
26 * Subclasses should override one or more methods to modify the behavior of
27 * the backing collection as desired per the <a
28 * href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
29 *
30 * @see ForwardingObject
31 * @author Kevin Bourrillion
32 * @since 2010.01.04 <b>stable</b> (imported from Google Collections Library)
33 */
34@GwtCompatible
35public abstract class ForwardingCollection<E> extends ForwardingObject
36    implements Collection<E> {
37
38  @Override protected abstract Collection<E> delegate();
39
40  public Iterator<E> iterator() {
41    return delegate().iterator();
42  }
43
44  public int size() {
45    return delegate().size();
46  }
47
48  public boolean removeAll(Collection<?> collection) {
49    return delegate().removeAll(collection);
50  }
51
52  public boolean isEmpty() {
53    return delegate().isEmpty();
54  }
55
56  public boolean contains(Object object) {
57    return delegate().contains(object);
58  }
59
60  public Object[] toArray() {
61    return delegate().toArray();
62  }
63
64  public <T> T[] toArray(T[] array) {
65    return delegate().toArray(array);
66  }
67
68  public boolean add(E element) {
69    return delegate().add(element);
70  }
71
72  public boolean remove(Object object) {
73    return delegate().remove(object);
74  }
75
76  public boolean containsAll(Collection<?> collection) {
77    return delegate().containsAll(collection);
78  }
79
80  public boolean addAll(Collection<? extends E> collection) {
81    return delegate().addAll(collection);
82  }
83
84  public boolean retainAll(Collection<?> collection) {
85    return delegate().retainAll(collection);
86  }
87
88  public void clear() {
89    delegate().clear();
90  }
91}
92