01: /*
02: ** $Id: Controller.java,v 1.4 2000/10/26 08:34:15 mrw Exp $
03: **
04: ** Mike Wilson, July 2000, mrw@whisperingwind.co.uk
05: **
06: ** (C) Copyright 2000, Mike Wilson, Reading, Berkshire, UK
07: **
08: ** This program is free software; you can redistribute it and/or modify
09: ** it under the terms of the GNU General Public License as published by
10: ** the Free Software Foundation; either version 2 of the License, or
11: ** (at your option) any later version.
12: **
13: ** This program is distributed in the hope that it will be useful,
14: ** but WITHOUT ANY WARRANTY; without even the implied warranty of
15: ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16: ** GNU General Public License for more details.
17: **
18: ** You should have received a copy of the GNU Library General
19: ** Public License along with this library; if not, write to the
20: ** Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21: ** Boston, MA 02111-1307 USA.
22: */
23:
24: package uk.co.whisperingwind.framework;
25:
26: import java.util.Observable;
27: import java.util.Observer;
28:
29: /**
30: ** Base class for all controllers.
31: */
32:
33: public abstract class Controller extends Observable implements Observer {
34: /**
35: ** Fire a controller event. This is the same kind of event as a
36: ** view event. This allows controllers to have sub-controllers to
37: ** which they listen.
38: */
39:
40: protected void fireEvent(String arg1, String arg2) {
41: setChanged();
42: notifyObservers(new ViewEvent(this , arg1, arg2));
43: }
44:
45: /**
46: ** Catches update events from models, views and sub-controllers.
47: ** These are dispatched into the modelEvent () and viewEvent
48: ** methods.
49: */
50:
51: public void update(Observable observable, Object arg) {
52: if (arg instanceof ModelEvent)
53: modelEvent((ModelEvent) arg);
54: else if (arg instanceof ViewEvent)
55: viewEvent((ViewEvent) arg);
56: }
57:
58: /**
59: ** Called whenever a model event occurs.
60: */
61:
62: public abstract void modelEvent(ModelEvent event);
63:
64: /**
65: ** Called whenever a view event occurs.
66: */
67:
68: public abstract void viewEvent(ViewEvent event);
69: }
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