nextapp.echo.app.list.AbstractListModel Maven / Gradle / Ivy
/*
* This file is part of the Echo Web Application Framework (hereinafter "Echo").
* Copyright (C) 2002-2009 NextApp, Inc.
*
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
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* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*/
package nextapp.echo.app.list;
import java.io.Serializable;
import java.util.EventListener;
import nextapp.echo.app.event.EventListenerList;
import nextapp.echo.app.event.ListDataEvent;
import nextapp.echo.app.event.ListDataListener;
/**
* A base class from which ListModel implementations may be
* derived. This class provides event listener management facilities.
*/
public abstract class AbstractListModel
implements ListModel, Serializable {
/**
* A storage facility for EventListeners.
*/
private EventListenerList listenerList = new EventListenerList();
/**
* Creates a new AbstractListModel.
*/
public AbstractListModel() {
super();
}
/**
* @see nextapp.echo.app.list.ListModel#addListDataListener(nextapp.echo.app.event.ListDataListener)
*/
public void addListDataListener(ListDataListener l) {
listenerList.addListener(ListDataListener.class, l);
}
/**
* Returns the EventListenerList being used to manage event
* listeners.
*
* @return the listener list
*/
protected EventListenerList getEventListenerList() {
return listenerList;
}
/**
* Notifies listeners that the contents of the list have changed.
* Subclasses must call this method
* after one or elements are changed.
*
* @param index0 the index of the first changed item
* @param index1 the index of the last changed item
*/
protected void fireContentsChanged(int index0, int index1) {
ListDataEvent e = new ListDataEvent(this, ListDataEvent.CONTENTS_CHANGED, index0, index1);
EventListener[] listeners = listenerList.getListeners(ListDataListener.class);
for (int index = 0; index < listeners.length; ++index) {
((ListDataListener) listeners[index]).contentsChanged(e);
}
}
/**
* Notifies listeners that an interval of items was added.
* Subclasses must call this method
* after one or elements are added.
*
* @param index0 the index of the first added item
* @param index1 the index of the last added item
*/
protected void fireIntervalAdded(int index0, int index1) {
ListDataEvent e = new ListDataEvent(this, ListDataEvent.INTERVAL_ADDED, index0, index1);
EventListener[] listeners = listenerList.getListeners(ListDataListener.class);
for (int index = 0; index < listeners.length; ++index) {
((ListDataListener) listeners[index]).intervalAdded(e);
}
}
/**
* Notifies listeners that an interval of items was removed.
* Subclasses must call this method
* after one or elements are removed.
*
* @param index0 the index of the first removed index
* @param index1 the index of the last removed index
*/
protected void fireIntervalRemoved(int index0, int index1) {
ListDataEvent e = new ListDataEvent(this, ListDataEvent.INTERVAL_REMOVED, index0, index1);
EventListener[] listeners = listenerList.getListeners(ListDataListener.class);
for (int index = 0; index < listeners.length; ++index) {
((ListDataListener) listeners[index]).intervalRemoved(e);
}
}
/**
* @see nextapp.echo.app.list.ListModel#removeListDataListener(nextapp.echo.app.event.ListDataListener)
*/
public void removeListDataListener(ListDataListener l) {
listenerList.removeListener(ListDataListener.class, l);
}
}