UniqueList.java |
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 }