/*
* Copyright (C) 2012, Katy Hilgenberg.
* Special acknowledgments to: Knowledge & Data Engineering Group, University of Kassel (http://www.kde.cs.uni-kassel.de).
* Contact: sdcf@cs.uni-kassel.de
*
* This file is part of the SDCFramework (Sensor Data Collection Framework) project.
*
* The SDCFramework 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 3 of the License, or
* (at your option) any later version.
*
* The SDCFramework 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 the SDCFramework. If not, see <http://www.gnu.org/licenses/>.
*/
package de.unikassel.android.sdcframework.util.facade;
/**
* Interface for classes creating {@linkplain ObservableEvent observable events
* * }. <br/>
* <br/>
* Any class in the SDC framework which does act as observable event source must
* implementing this interface for the observable {@linkplain ObservableEvent
* event types}. <br/>
* <br/>
* Observers for the observable events have to extend the
* {@linkplain EventObserver generic event observer class}.
*
* @see EventObserver
* @see ObservableEvent
* @see de.unikassel.android.sdcframework.util.ObservableEventSourceImpl
*
* @author Katy Hilgenberg
*
* @param <T>
* the observed event type extending {@linkplain ObservableEvent}
*/
public interface ObservableEventSource< T extends ObservableEvent > extends
ObserverRegistration< T >
{
/**
* Does set the changed flag and notifies all observers
*
* @param data
* the observable event data to create notifications for
*/
public abstract void notify( T data );
/**
* Test method for observers.
*
* @return true if observers are registered, false otherwise
*/
public abstract boolean hasObservers();
}