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Java > Open Source Codes > org > columba > core > connectionstate > ConnectionState


1 //The contents of this file are subject to the Mozilla Public License Version 1.1
2 //(the "License"); you may not use this file except in compliance with the
3 //License. You may obtain a copy of the License at http://www.mozilla.org/MPL/
4 //
5 //Software distributed under the License is distributed on an "AS IS" basis,
6 //WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
7 //for the specific language governing rights and
8 //limitations under the License.
9 //
10 //The Original Code is "The Columba Project"
11 //
12 //The Initial Developers of the Original Code are Frederik Dietz and Timo Stich.
13 //Portions created by Frederik Dietz and Timo Stich are Copyright (C) 2003.
14 //
15 //All Rights Reserved.
16
17 package org.columba.core.connectionstate;
18
19 import javax.swing.event.ChangeListener JavaDoc;
20
21 /**
22  * Encapsulates the system's connection state. Enables clients to register
23  * listeners in order to get notified on state changes.
24  */
25 public interface ConnectionState {
26     /**
27      * Registers a listener to get notified on changes.
28      */
29     public void addChangeListener(ChangeListener JavaDoc l);
30     
31     /**
32      * Removes a previously registered listener.
33      */
34     public void removeChangeListener(ChangeListener JavaDoc l);
35     
36     /**
37      * Returns whether the system is currently online.
38      */
39     public boolean isOnline();
40     
41     /**
42      * Sets the system's online state and notifies registered listeners.
43      */
44     public void setOnline(boolean b);
45 }
46
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