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  /**
18   * <a href="FiniteUniqueStack.java.html"><b><i>View Source</i></b></a>
19   *
20   * @author Brian Wing Shun Chan
21   */
22  public class FiniteUniqueStack<E> extends FiniteStack<E> {
23  
24      public FiniteUniqueStack(int maxSize) {
25          super(maxSize);
26      }
27  
28      public E push(E item) {
29          if (!contains(item)) {
30              super.push(item);
31          }
32          else {
33              if (!item.equals(peek())) {
34                  remove(item);
35                  super.push(item);
36              }
37          }
38  
39          return item;
40      }
41  
42  }