| FiniteUniqueStack.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 /**
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 }