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  }