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Java > Open Source Codes > org > jruby > util > collections > IdentitySet


1 /***** BEGIN LICENSE BLOCK *****
2  * Version: CPL 1.0/GPL 2.0/LGPL 2.1
3  *
4  * The contents of this file are subject to the Common Public
5  * License Version 1.0 (the "License"); you may not use this file
6  * except in compliance with the License. You may obtain a copy of
7  * the License at http://www.eclipse.org/legal/cpl-v10.html
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11  * implied. See the License for the specific language governing
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13  *
14  * Copyright (C) 2001-2002 Jan Arne Petersen <jpetersen@uni-bonn.de>
15  * Copyright (C) 2002-2004 Anders Bengtsson <ndrsbngtssn@yahoo.se>
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17  * Alternatively, the contents of this file may be used under the terms of
18  * either of the GNU General Public License Version 2 or later (the "GPL"),
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28  ***** END LICENSE BLOCK *****/
29 package org.jruby.util.collections;
30
31 import java.util.ArrayList JavaDoc;
32 import java.util.Collection JavaDoc;
33 import java.util.Iterator JavaDoc;
34
35
36 public class IdentitySet {
37     private Collection JavaDoc items = new ArrayList JavaDoc();
38
39     public void add(Object JavaDoc item) {
40         items.add(item);
41     }
42
43     public void remove(Object JavaDoc item) {
44         Iterator JavaDoc iter = items.iterator();
45         while (iter.hasNext()) {
46             Object JavaDoc storedItem = iter.next();
47             if (item == storedItem) {
48                 iter.remove();
49             }
50         }
51     }
52
53     public boolean contains(Object JavaDoc item) {
54         Iterator JavaDoc iter = items.iterator();
55         while (iter.hasNext()) {
56             Object JavaDoc storedItem = iter.next();
57             if (item == storedItem) {
58                 return true;
59             }
60         }
61         return false;
62     }
63 }
64
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