01: /**
02: * Copyright (c) 2000-2008 Liferay, Inc. All rights reserved.
03: *
04: * Permission is hereby granted, free of charge, to any person obtaining a copy
05: * of this software and associated documentation files (the "Software"), to deal
06: * in the Software without restriction, including without limitation the rights
07: * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
08: * copies of the Software, and to permit persons to whom the Software is
09: * 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: */package com.liferay.util;
22:
23: import java.util.ArrayList;
24: import java.util.Collection;
25: import java.util.Iterator;
26:
27: /**
28: * <a href="UniqueList.java.html"><b><i>View Source</i></b></a>
29: *
30: * @author Brian Wing Shun Chan
31: *
32: */
33: public class UniqueList extends ArrayList {
34:
35: public UniqueList() {
36: super ();
37: }
38:
39: public boolean add(Object obj) {
40: if (!contains(obj)) {
41: return super .add(obj);
42: } else {
43: return false;
44: }
45: }
46:
47: public void add(int index, Object obj) {
48: if (!contains(obj)) {
49: super .add(index, obj);
50: }
51: }
52:
53: public boolean addAll(Collection c) {
54: Iterator itr = c.iterator();
55:
56: while (itr.hasNext()) {
57: Object obj = itr.next();
58:
59: if (contains(obj)) {
60: itr.remove();
61: }
62: }
63:
64: return super .addAll(c);
65: }
66:
67: public boolean addAll(int index, Collection c) {
68: Iterator itr = c.iterator();
69:
70: while (itr.hasNext()) {
71: Object obj = itr.next();
72:
73: if (contains(obj)) {
74: itr.remove();
75: }
76: }
77:
78: return super .addAll(index, c);
79: }
80:
81: public Object set(int index, Object obj) {
82: if (!contains(obj)) {
83: return super.set(index, obj);
84: } else {
85: return obj;
86: }
87: }
88:
89: }
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