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  * Copyright (C) 2009 The Guava Authors
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
List returned by ImmutableCollection.asList() that delegates contains checks to the backing collection.

Jared Levy
Louis Wasserman
@GwtCompatible(serializable = true, emulated = true)
abstract class ImmutableAsList<E> extends ImmutableList<E> {
  @Override public boolean contains(Object target) {
    // The collection's contains() is at least as fast as ImmutableList's
    // and is often faster.
    return delegateCollection().contains(target);
  public int size() {
    return delegateCollection().size();
  public boolean isEmpty() {
    return delegateCollection().isEmpty();
  boolean isPartialView() {
    return delegateCollection().isPartialView();

Serialized form that leads to the same performance as the original list.
  static class SerializedForm implements Serializable {
    final ImmutableCollection<?> collection;
    SerializedForm(ImmutableCollection<?> collection) {
      this. = collection;
    Object readResolve() {
      return .asList();
    private static final long serialVersionUID = 0;
  private void readObject(ObjectInputStream stream)
      throws InvalidObjectException {
    throw new InvalidObjectException("Use SerializedForm");
    return new SerializedForm(delegateCollection());
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