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
21import java.io.InvalidObjectException;
22import java.io.ObjectInputStream;
23import java.io.Serializable;
24
25/**
26 * List returned by {@link ImmutableCollection#asList} when the collection isn't
27 * an {@link ImmutableList} or an {@link ImmutableSortedSet}.
28 *
29 * @author Jared Levy
30 */
31@GwtCompatible(serializable = true, emulated = true)
32@SuppressWarnings("serial")
33final class ImmutableAsList<E> extends RegularImmutableList<E> {
34  private final transient ImmutableCollection<E> collection;
35
36  ImmutableAsList(Object[] array, ImmutableCollection<E> collection) {
37    super(array, 0, array.length);
38    this.collection = collection;
39  }
40
41  @Override public boolean contains(Object target) {
42    // The collection's contains() is at least as fast as RegularImmutableList's
43    // and is often faster.
44    return collection.contains(target);
45  }
46
47  /**
48   * Serialized form that leads to the same performance as the original list.
49   */
50  static class SerializedForm implements Serializable {
51    final ImmutableCollection<?> collection;
52    SerializedForm(ImmutableCollection<?> collection) {
53      this.collection = collection;
54    }
55    Object readResolve() {
56      return collection.asList();
57    }
58    private static final long serialVersionUID = 0;
59  }
60
61  private void readObject(ObjectInputStream stream)
62      throws InvalidObjectException {
63    throw new InvalidObjectException("Use SerializedForm");
64  }
65
66  @Override Object writeReplace() {
67    return new SerializedForm(collection);
68  }
69}
70