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/***************************************************************************
* Copyright (c) 2004-2007 Eike Stepper, Germany.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
**************************************************************************/
package org.eclipse.net4j.util.event;
/**
* @author Eike Stepper
*/
public final class EventUtil
{
private static final IListener[] NO_LISTENERS = new IListener[0];
private EventUtil()
{
}
public static boolean addListener(Object notifier, IListener listener)
{
if (notifier instanceof INotifier)
{
((INotifier)notifier).addListener(listener);
return true;
}
return false;
}
public static boolean removeListener(Object notifier, IListener listener)
{
if (notifier instanceof INotifier)
{
((INotifier)notifier).removeListener(listener);
return true;
}
return false;
}
public static IListener[] getListeners(Object notifier)
{
if (notifier instanceof INotifier.Introspection)
{
return ((INotifier.Introspection)notifier).getListeners();
}
return NO_LISTENERS;
}
}
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