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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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.collect;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.Serializable;
/**
* List returned by {@link ImmutableCollection#asList} that delegates {@code contains} checks
* to the backing collection.
*
* @author Jared Levy
* @author Louis Wasserman
*/
@GwtCompatible(serializable = true, emulated = true)
@SuppressWarnings("serial")
abstract class ImmutableAsList<E> extends ImmutableList<E> {
abstract ImmutableCollection<E> delegateCollection();
@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);
}
@Override
public int size() {
return delegateCollection().size();
}
@Override
public boolean isEmpty() {
return delegateCollection().isEmpty();
}
@Override
boolean isPartialView() {
return delegateCollection().isPartialView();
}
/**
* Serialized form that leads to the same performance as the original list.
*/
@GwtIncompatible("serialization")
static class SerializedForm implements Serializable {
final ImmutableCollection<?> collection;
SerializedForm(ImmutableCollection<?> collection) {
this.collection = collection;
}
Object readResolve() {
return collection.asList();
}
private static final long serialVersionUID = 0;
}
@GwtIncompatible("serialization")
private void readObject(ObjectInputStream stream)
throws InvalidObjectException {
throw new InvalidObjectException("Use SerializedForm");
}
@GwtIncompatible("serialization")
@Override Object writeReplace() {
return new SerializedForm(delegateCollection());
}
}
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