01: /*
02: * Beryl - A web platform based on XML, XSLT and Java
03: * This file is part of the Beryl XML GUI
04: *
05: * Copyright (C) 2004 Wenzel Jakob <wazlaf@tigris.org>
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU Lesser General Public
09: * License as published by the Free Software Foundation; either
10: * version 2.1 of the License, or (at your option) any later version.
11:
12: * This program is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15: * Lesser General Public License for more details.
16: *
17: * You should have received a copy of the GNU Lesser General Public
18: * License along with this program; if not, write to the Free Software
19: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-3107 USA
20: */
21:
22: package org.beryl.gui.model;
23:
24: import java.io.Serializable;
25: import java.util.HashSet;
26: import java.util.Iterator;
27: import java.util.Set;
28:
29: import org.beryl.gui.GUIException;
30: import org.beryl.gui.View;
31:
32: public abstract class AbstractDataModel implements DataModel,
33: Serializable {
34: private transient Set modelChangeListeners = null;
35: private transient Set views = null;
36:
37: public void addView(View view) {
38: if (views == null)
39: views = new HashSet();
40: views.add(view);
41: }
42:
43: public void removeView(View view) {
44: if (views != null)
45: views.remove(view);
46: }
47:
48: public void addModelChangeListener(ModelChangeListener mcl) {
49: if (modelChangeListeners == null)
50: modelChangeListeners = new HashSet();
51: modelChangeListeners.add(mcl);
52: }
53:
54: public void removeModelChangeListener(ModelChangeListener mcl) {
55: if (modelChangeListeners != null)
56: modelChangeListeners.remove(mcl);
57: }
58:
59: protected void fireModelEvent(ModelChangeEvent event)
60: throws GUIException {
61: if (views != null) {
62: /* Update all views */
63: for (Iterator i = views.iterator(); i.hasNext();) {
64: View view = (View) i.next();
65: /* Dont send events back to their source */
66: if (view != event.getSource()) {
67: view.modelChanged(event);
68: }
69: }
70: }
71:
72: if (modelChangeListeners != null) {
73: /* If there are additional ModelChangeListeners attached, notify them too */
74: for (Iterator i = modelChangeListeners.iterator(); i
75: .hasNext();) {
76: ((ModelChangeListener) i.next()).modelChanged(event);
77: }
78: }
79: }
80: }
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