1/*
2 * Copyright (C) 2009 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 java.util.Collection;
20
21import javax.annotation.Nullable;
22
23/**
24 * A GWT-only class only used by GWT emulations.  It is used to consolidate the
25 * definitions of method delegation to save code size.
26 *
27 * @author Hayward Chan
28 */
29// TODO: Make this class GWT serializable.
30class ForwardingImmutableCollection<E> extends ImmutableCollection<E> {
31
32  transient final Collection<E> delegate;
33
34  ForwardingImmutableCollection(Collection<E> delegate) {
35    this.delegate = delegate;
36  }
37
38  @Override public UnmodifiableIterator<E> iterator() {
39    return Iterators.unmodifiableIterator(delegate.iterator());
40  }
41
42  @Override public boolean contains(@Nullable Object object) {
43    return object != null && delegate.contains(object);
44  }
45
46  @Override public boolean containsAll(Collection<?> targets) {
47    return delegate.containsAll(targets);
48  }
49
50  public int size() {
51    return delegate.size();
52  }
53
54  @Override public boolean isEmpty() {
55    return delegate.isEmpty();
56  }
57
58  @Override public Object[] toArray() {
59    return delegate.toArray();
60  }
61
62  @Override public <T> T[] toArray(T[] other) {
63    return delegate.toArray(other);
64  }
65
66  @Override public String toString() {
67    return delegate.toString();
68  }
69}
70