1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    *
5    *
6    *
7    * The contents of this file are subject to the terms of the Liferay Enterprise
8    * Subscription License ("License"). You may not use this file except in
9    * compliance with the License. You can obtain a copy of the License by
10   * contacting Liferay, Inc. See the License for the specific language governing
11   * permissions and limitations under the License, including but not limited to
12   * distribution rights 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<E> extends ArrayList<E> {
36  
37      public UniqueList() {
38          super();
39      }
40  
41      public boolean add(E e) {
42          if (!contains(e)) {
43              return super.add(e);
44          }
45          else {
46              return false;
47          }
48      }
49  
50      public void add(int index, E e) {
51          if (!contains(e)) {
52              super.add(index, e);
53          }
54      }
55  
56      public boolean addAll(Collection<? extends E> c) {
57          c = new ArrayList<E>(c);
58  
59          Iterator<? extends E> itr = c.iterator();
60  
61          while (itr.hasNext()) {
62              E e = itr.next();
63  
64              if (contains(e)) {
65                  itr.remove();
66              }
67          }
68  
69          return super.addAll(c);
70      }
71  
72      public boolean addAll(int index, Collection<? extends E> c) {
73          c = new ArrayList<E>(c);
74  
75          Iterator<? extends E> itr = c.iterator();
76  
77          while (itr.hasNext()) {
78              E e = itr.next();
79  
80              if (contains(e)) {
81                  itr.remove();
82              }
83          }
84  
85          return super.addAll(index, c);
86      }
87  
88      public E set(int index, E e) {
89          if (!contains(e)) {
90              return super.set(index, e);
91          }
92          else {
93              return e;
94          }
95      }
96  
97  }