| UniqueList.java |
1 /**
2 * Copyright (c) 2000-2009 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<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 }