/*
 * 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;
import com.google.common.annotations.GwtIncompatible;

/**
 * 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);
	}

	@GwtIncompatible("not present in emulated superclass")
	@Override
	int copyIntoArray(Object[] dst, int offset) {
		return delegateList.copyIntoArray(dst, offset);
	}

	@Override
	public E get(int index) {
		return delegateList.get(index);
	}
}
