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 com.google.common.annotations.GwtCompatible;
20
21/**
22 * List returned by {@link ImmutableCollection#asList} that delegates {@code contains} checks
23 * to the backing collection.
24 *
25 * @author Jared Levy
26 * @author Louis Wasserman
27 */
28@GwtCompatible(serializable = true, emulated = true)
29@SuppressWarnings("serial")
30abstract class ImmutableAsList<E> extends ImmutableList<E> {
31  abstract ImmutableCollection<E> delegateCollection();
32
33  @Override public boolean contains(Object target) {
34    // The collection's contains() is at least as fast as ImmutableList's
35    // and is often faster.
36    return delegateCollection().contains(target);
37  }
38
39  @Override
40  public int size() {
41    return delegateCollection().size();
42  }
43
44  @Override
45  public boolean isEmpty() {
46    return delegateCollection().isEmpty();
47  }
48
49  @Override
50  boolean isPartialView() {
51    return delegateCollection().isPartialView();
52  }
53}
54
55