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/**
* Copyright (c) 2004 - 2011 Eike Stepper (Berlin, Germany) and others.
* 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;
/**
* An entity that a number of {@link IListener listeners} can be registered with and that can fire {@link IEvent events}
* to these registered listeners.
* <p>
* Implementors are encouraged to document the event types that they are able to fire and that their listeners may want
* to receive and handle.
* <p>
* Implementors may want to extend {@link Notifier} instead of implementing this interface directly.
*
* @author Eike Stepper
*/
public interface INotifier
{
/**
* Adds a listener to this notifier.
* <p>
* Depending on the implementation duplicate listeners may lead to duplicate event delivery or not. Implementors are
* encouraged to prevent events from being delivered more than once to the same listener,
*/
public void addListener(IListener listener);
/**
* Removes a listener from this notifier.
*/
public void removeListener(IListener listener);
/**
* Returns <code>true</code> if one or more listeners are registered with this notifier, <code>false</code> otherwise.
*
* @since 3.0
*/
public boolean hasListeners();
/**
* Returns the listeners that are registered with this notifier.
* <p>
* Depending on the implementation duplicate listeners may be contained in the returned array.
*
* @since 3.0
*/
public IListener[] getListeners();
}
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