FiniteStack.java |
1 /** 2 * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved. 3 * 4 * This library is free software; you can redistribute it and/or modify it under 5 * the terms of the GNU Lesser General Public License as published by the Free 6 * Software Foundation; either version 2.1 of the License, or (at your option) 7 * any later version. 8 * 9 * This library is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 11 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more 12 * details. 13 */ 14 15 package com.liferay.util; 16 17 import java.util.Stack; 18 19 /** 20 * <a href="FiniteStack.java.html"><b><i>View Source</i></b></a> 21 * 22 * @author Brian Wing Shun Chan 23 */ 24 public class FiniteStack<E> extends Stack<E> { 25 26 public FiniteStack(int maxSize) { 27 super(); 28 29 _maxSize = maxSize; 30 } 31 32 public E push(E item) { 33 super.push(item); 34 35 int size = size(); 36 37 if (size > _maxSize) { 38 removeElementAt(size - 1); 39 } 40 41 return item; 42 } 43 44 private int _maxSize; 45 46 }