/* This file is part of the db4o object database http://www.db4o.com
Copyright (C) 2004 - 2011 Versant Corporation http://www.versant.com
db4o is free software; you can redistribute it and/or modify it under
the terms of version 3 of the GNU General Public License as published
by the Free Software Foundation.
db4o 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 General Public License
for more details.
You should have received a copy of the GNU General Public License along
with this program. If not, see http://www.gnu.org/licenses/. */
package com.db4o.foundation;
/**
* @exclude
*/
public class ListenerRegistry <E>{
public static <E> ListenerRegistry<E> newInstance() {
return new ListenerRegistry<E>();
}
private IdentitySet4 _listeners;
public void register(Listener4<E> listener){
if(_listeners == null){
_listeners = new IdentitySet4();
}
_listeners.add(listener);
}
public void notifyListeners(E event){
if(_listeners == null){
return;
}
Iterator4 i = _listeners.iterator();
while(i.moveNext()){
((Listener4)i.current()).onEvent(event);
}
}
public void remove(Listener4<E> listener) {
if (_listeners == null) {
return;
}
_listeners.remove(listener);
}
}