1   /**
2    * Copyright (c) 2000-2007 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.util;
24  
25  import java.util.ArrayList;
26  import java.util.Collection;
27  import java.util.Iterator;
28  
29  /**
30   * <a href="UniqueList.java.html"><b><i>View Source</i></b></a>
31   *
32   * @author Brian Wing Shun Chan
33   *
34   */
35  public class UniqueList extends ArrayList {
36  
37      public UniqueList() {
38          super();
39      }
40  
41      public boolean add(Object obj) {
42          if (!contains(obj)) {
43              return super.add(obj);
44          }
45          else {
46              return false;
47          }
48      }
49  
50      public void add(int index, Object obj) {
51          if (!contains(obj)) {
52              super.add(index, obj);
53          }
54      }
55  
56      public boolean addAll(Collection c) {
57          Iterator itr = c.iterator();
58  
59          while (itr.hasNext()) {
60              Object obj = itr.next();
61  
62              if (contains(obj)) {
63                  itr.remove();
64              }
65          }
66  
67          return super.addAll(c);
68      }
69  
70      public boolean addAll(int index, Collection c) {
71          Iterator itr = c.iterator();
72  
73          while (itr.hasNext()) {
74              Object obj = itr.next();
75  
76              if (contains(obj)) {
77                  itr.remove();
78              }
79          }
80  
81          return super.addAll(index, c);
82      }
83  
84      public Object set(int index, Object obj) {
85          if (!contains(obj)) {
86              return super.set(index, obj);
87          }
88          else {
89              return obj;
90          }
91      }
92  
93  }