001 /** 002 * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved. 003 * 004 * The contents of this file are subject to the terms of the Liferay Enterprise 005 * Subscription License ("License"). You may not use this file except in 006 * compliance with the License. You can obtain a copy of the License by 007 * contacting Liferay, Inc. See the License for the specific language governing 008 * permissions and limitations under the License, including but not limited to 009 * distribution rights of the Software. 010 * 011 * 012 * 013 */ 014 015 package com.liferay.util; 016 017 import java.util.Stack; 018 019 /** 020 * @author Brian Wing Shun Chan 021 */ 022 public class FiniteStack<E> extends Stack<E> { 023 024 public FiniteStack(int maxSize) { 025 super(); 026 027 _maxSize = maxSize; 028 } 029 030 public E push(E item) { 031 super.push(item); 032 033 int size = size(); 034 035 if (size > _maxSize) { 036 removeElementAt(size - 1); 037 } 038 039 return item; 040 } 041 042 private int _maxSize; 043 044 }