/*
    * Copyright (C) 2012 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;
  
  /**
   * An {@link ImmutableAsList} implementation specialized for when the delegate collection is
   * already backed by an {@code ImmutableList} or array.
   *
   * @author Louis Wasserman
   */
  @GwtCompatible(emulated = true)
  @SuppressWarnings("serial") // uses writeReplace, not default serialization
  class RegularImmutableAsList<E> extends ImmutableAsList<E> {
    private final ImmutableCollection<E> delegate;
    private final ImmutableList<? extends E> delegateList;
  
    RegularImmutableAsList(ImmutableCollection<E> delegate, ImmutableList<? extends E> delegateList) {
      this.delegate = delegate;
      this.delegateList = delegateList;
    }
  
    RegularImmutableAsList(ImmutableCollection<E> delegate, Object[] array) {
      this(delegate, ImmutableList.<E>asImmutableList(array));
    }
  
    @Override
    ImmutableCollection<E> delegateCollection() {
      return delegate;
    }
  
    ImmutableList<? extends E> delegateList() {
      return delegateList;
    }
  
    @SuppressWarnings("unchecked")  // safe covariant cast!
    @Override
    public UnmodifiableListIterator<E> listIterator(int index) {
      return (UnmodifiableListIterator<E>) delegateList.listIterator(index);
    }
  
    @Override
    public E get(int index) {
      return delegateList.get(index);
    }
  }