FiniteStack.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 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 }