/*
    * 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());
    }
  }