01: //The contents of this file are subject to the Mozilla Public License Version 1.1
02: //(the "License"); you may not use this file except in compliance with the
03: //License. You may obtain a copy of the License at http://www.mozilla.org/MPL/
04: //
05: //Software distributed under the License is distributed on an "AS IS" basis,
06: //WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
07: //for the specific language governing rights and
08: //limitations under the License.
09: //
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;
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 l);
30:
31: /**
32: * Removes a previously registered listener.
33: */
34: public void removeChangeListener(ChangeListener 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: }
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