/*
GNU LESSER GENERAL PUBLIC LICENSE
Copyright (C) 2006 The Lobo Project
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Contact info: lobochief@users.sourceforge.net
*/
/*
* Created on Mar 19, 2005
*/
package org.lobobrowser.util;
import java.util.ArrayList;
import java.util.Collection;
import java.util.EventListener;
import java.util.EventObject;
/**
* @author J. H. S.
*/
public abstract class EventDispatch2 {
private Collection<EventListener> listeners;
private static final EventListener[] EMPTY_ARRAY = new EventListener[0];
public EventDispatch2() {
}
public Collection<EventListener> createListenerCollection() {
return new ArrayList<>();
}
public final void addListener(final EventListener listener) {
synchronized (this) {
if (this.listeners == null) {
this.listeners = this.createListenerCollection();
}
this.listeners.add(listener);
}
}
public final void removeListener(final EventListener listener) {
synchronized (this) {
if (this.listeners != null) {
this.listeners.remove(listener);
}
}
}
public final boolean fireEvent(final EventObject event) {
EventListener[] larray;
synchronized (this) {
final Collection<EventListener> listeners = this.listeners;
if ((listeners == null) || (listeners.size() == 0)) {
return false;
}
larray = this.listeners.toArray(EMPTY_ARRAY);
}
final int length = larray.length;
for (int i = 0; i < length; i++) {
// Call holding no locks
this.dispatchEvent(larray[i], event);
}
return true;
}
protected abstract void dispatchEvent(EventListener listener, EventObject event);
}