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Java > Open Source Codes > org > columba > chat > model > BuddyList


1 // The contents of this file are subject to the Mozilla Public License Version
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// 1.1
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//(the "License"); you may not use this file except in compliance with the
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//License. You may obtain a copy of the License at http://www.mozilla.org/MPL/
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//
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//Software distributed under the License is distributed on an "AS IS" basis,
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//WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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//for the specific language governing rights and
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//limitations under the License.
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//
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//The Original Code is "The Columba Project"
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//
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//The Initial Developers of the Original Code are Frederik Dietz and Timo
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// Stich.
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//Portions created by Frederik Dietz and Timo Stich are Copyright (C) 2003.
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//
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//All Rights Reserved.
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package org.columba.chat.model;
19
20 import java.util.HashMap JavaDoc;
21 import java.util.Map JavaDoc;
22
23 import org.columba.chat.model.api.IBuddyStatus;
24
25 /**
26  * Manages a list of buddies.
27  *
28  * @author fdietz
29  */

30 public class BuddyList {
31
32     private Map JavaDoc map;
33
34     private static BuddyList instance = new BuddyList();
35
36     private BuddyList() {
37         map = new HashMap JavaDoc();
38     }
39
40     public static BuddyList getInstance() {
41         return instance;
42     }
43
44     public void add(String JavaDoc jabberId, IBuddyStatus buddy) {
45         if (jabberId == null)
46             throw new IllegalArgumentException JavaDoc("jabberId == null");
47         if (buddy == null)
48             throw new IllegalArgumentException JavaDoc("buddy == null");
49
50         map.put(jabberId, buddy);
51     }
52
53     public boolean exists(String JavaDoc jabberId) {
54         if (jabberId == null)
55             throw new IllegalArgumentException JavaDoc("jabberId == null");
56         return map.containsKey(jabberId);
57     }
58
59     public BuddyStatus getBuddy(String JavaDoc jabberId) {
60         if (jabberId == null)
61             throw new IllegalArgumentException JavaDoc("jabberId == null");
62
63         if (map.containsKey(jabberId))
64             return (BuddyStatus) map.get(jabberId);
65
66         return null;
67     }
68 }
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