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