| /******************************************************************************* |
| * Copyright (c) 2015 Oracle. All rights reserved. |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v1.0, which accompanies this distribution |
| * and is available at http://www.eclipse.org/legal/epl-v10.html. |
| * |
| * Contributors: |
| * Oracle - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.jpt.common.utility.internal.deque; |
| |
| import java.io.Serializable; |
| import org.eclipse.jpt.common.utility.deque.Deque; |
| import org.eclipse.jpt.common.utility.internal.ObjectTools; |
| |
| /** |
| * This deque will reverse the order of the configured deque. |
| * @param <E> the type of elements maintained by the deque |
| * @see DequeTools |
| */ |
| public class ReverseDeque<E> |
| implements Deque<E>, Serializable |
| { |
| private Deque<E> deque; |
| |
| private static final long serialVersionUID = 1L; |
| |
| |
| // ********** constructors ********** |
| |
| /** |
| * Construct a deque that reverses the specified deque. |
| */ |
| public ReverseDeque(Deque<E> deque) { |
| super(); |
| if (deque == null) { |
| throw new NullPointerException(); |
| } |
| this.deque = deque; |
| } |
| |
| |
| // ********** Deque implementation ********** |
| |
| public void enqueueTail(E element) { |
| this.deque.enqueueHead(element); |
| } |
| |
| public void enqueueHead(E element) { |
| this.deque.enqueueTail(element); |
| } |
| |
| public E dequeueHead() { |
| return this.deque.dequeueTail(); |
| } |
| |
| public E dequeueTail() { |
| return this.deque.dequeueHead(); |
| } |
| |
| public E peekHead() { |
| return this.deque.peekTail(); |
| } |
| |
| public E peekTail() { |
| return this.deque.peekHead(); |
| } |
| |
| public boolean isEmpty() { |
| return this.deque.isEmpty(); |
| } |
| |
| @Override |
| public String toString() { |
| return ObjectTools.toString(this, this.deque); |
| } |
| } |