/* class AbstractListModel
*
* Copyright (C) 2001 R M Pitman
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package charvax.swing;
import java.util.ArrayList;
import java.util.Iterator;
import charvax.swing.event.ListDataEvent;
import charvax.swing.event.ListDataListener;
/**
* The abstract base class for classes that implement the ListModel interface.
*/
public abstract class AbstractListModel
implements ListModel
{
/**
* Register an ListDataListener object.
*/
public void addListDataListener(ListDataListener l_) {
if (_listeners == null)
_listeners = new ArrayList<ListDataListener>();
_listeners.add(l_);
}
/** Remove the specified ListDataListener from the list of listeners
* that will be notified.
*/
public void removeListDataListener(ListDataListener l_) {
if (_listeners == null)
return;
_listeners.remove(l_);
}
/** Subclasses of AbstractListModel must call this method <b>after</b> the
* contents of one or more elements of the list has changed.
*/
public void fireContentsChanged(Object source_, int index0_, int index1_) {
if (_listeners == null)
return;
ListDataEvent event = new ListDataEvent(this,
ListDataEvent.CONTENTS_CHANGED, index0_, index1_);
for (Iterator<ListDataListener> iter = _listeners.iterator(); iter.hasNext(); ) {
ListDataListener l = (ListDataListener) iter.next();
l.contentsChanged(event);
}
}
/** Subclasses of AbstractListModel must call this method <b>after</b>
* one or more elements of the list has been removed from the model.
*/
public void fireIntervalRemoved(Object source_, int index0_, int index1_) {
if (_listeners == null)
return;
ListDataEvent event = new ListDataEvent(this,
ListDataEvent.INTERVAL_REMOVED, index0_, index1_);
for (Iterator<ListDataListener> iter = _listeners.iterator(); iter.hasNext(); ) {
ListDataListener l = (ListDataListener) iter.next();
l.contentsChanged(event);
}
}
/** Subclasses of AbstractListModel must call this method <b>after</b>
* one or more elements of the list has been added to the model.
*/
public void fireIntervalAdded(Object source_, int index0_, int index1_) {
if (_listeners == null)
return;
ListDataEvent event = new ListDataEvent(this,
ListDataEvent.INTERVAL_ADDED, index0_, index1_);
for (Iterator<ListDataListener> iter = _listeners.iterator(); iter.hasNext(); ) {
ListDataListener l = (ListDataListener) iter.next();
l.contentsChanged(event);
}
}
//====================================================================
// INSTANCE VARIABLES
/**
* A list of ListDataListeners registered for this object.
*/
protected ArrayList<ListDataListener> _listeners = null;
}