FiniteUniqueStack.java |
1 /** 2 * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved. 3 * 4 * The contents of this file are subject to the terms of the Liferay Enterprise 5 * Subscription License ("License"). You may not use this file except in 6 * compliance with the License. You can obtain a copy of the License by 7 * contacting Liferay, Inc. See the License for the specific language governing 8 * permissions and limitations under the License, including but not limited to 9 * distribution rights of the Software. 10 * 11 * 12 * 13 */ 14 15 package com.liferay.util; 16 17 /** 18 * <a href="FiniteUniqueStack.java.html"><b><i>View Source</i></b></a> 19 * 20 * @author Brian Wing Shun Chan 21 */ 22 public class FiniteUniqueStack<E> extends FiniteStack<E> { 23 24 public FiniteUniqueStack(int maxSize) { 25 super(maxSize); 26 } 27 28 public E push(E item) { 29 if (!contains(item)) { 30 super.push(item); 31 } 32 else { 33 if (!item.equals(peek())) { 34 remove(item); 35 super.push(item); 36 } 37 } 38 39 return item; 40 } 41 42 }