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  }