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/*****************************************************************************
* Copyright (c) 2014, 2015 CEA LIST, Christian W. Damus, 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:
* CEA LIST - Initial API and implementation
* Christian W. Damus - bug 465416
*
*****************************************************************************/
package org.eclipse.papyrus.infra.sync;
import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.common.command.CompoundCommand;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature;
/**
* Represents a dispatch option for an event of interest going on on the EMF command stack
*
* @author Laurent Wouters
*/
public abstract class EMFDispatch {
/**
* The current command aggregator
*/
private CompoundCommand aggregator;
/**
* Gets the notifier object of interest, or <code>null</code> if all notifiers are of interest
*
* @return The notifier object of interest
*/
public abstract EObject getNotifier();
/**
* Gets the changed feature of interest, or <code>null</code> if all features are of interest
*
* @return The changed feature of interest
*/
public abstract EStructuralFeature getFeature();
/**
* Reacts to the specified change notification
*
* @param notification
* The change notification
*/
public abstract void onChange(Notification notification);
/**
* Reacts to the clearing of the listener
*/
public abstract void onClear();
/**
* Dispatches the specified change notification
*
* @param notification
* The change notification
* @param aggregator
* The aggregated command being constructed
*
*/
public final void dispatch(Notification notification, CompoundCommand aggregator) {
this.aggregator = aggregator;
try {
onChange(notification);
} finally {
this.aggregator = null;
}
}
/**
* Reacts to a change with the specified command
*
* @param command
* A command
*/
public final void react(Command command) {
aggregator.append(command);
}
}
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