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/*******************************************************************************
* Copyright (c) 2013 protos software gmbh (http://www.protos.de).
* 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:
* Juergen Haug (initial contribution)
*
*******************************************************************************/
package org.eclipse.etrice.ui.common.support;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.change.ChangeDescription;
import org.eclipse.emf.ecore.change.util.BasicChangeRecorder;
import org.eclipse.emf.ecore.change.util.ChangeRecorder;
import org.eclipse.graphiti.features.IFeatureProvider;
import org.eclipse.graphiti.features.context.ICreateContext;
import org.eclipse.graphiti.features.impl.AbstractCreateFeature;
public abstract class ChangeAwareCreateFeature extends AbstractCreateFeature {
boolean hasDoneChanges;
public ChangeAwareCreateFeature(IFeatureProvider fp, String name,
String description) {
super(fp, name, description);
this.hasDoneChanges = false;
}
@Override
public final Object[] create(ICreateContext context) {
EObject rootObject = getContainerModelObject(context);
BasicChangeRecorder changeRecorder = new ChangeRecorder(rootObject);
Object[] result = doCreate(context);
boolean newObjects = result != null && result.length > 0;
ChangeDescription cd = changeRecorder.endRecording();
hasDoneChanges = !(cd.getObjectChanges().isEmpty()
&& cd.getObjectsToAttach().isEmpty()
&& cd.getObjectsToDetach().isEmpty() && cd.getResourceChanges()
.isEmpty());
if (!newObjects && hasDoneChanges){
cd.apply();
hasDoneChanges = false;
}
return result;
}
@Override
public final boolean hasDoneChanges() {
return hasDoneChanges;
}
/**
* {@link AbstractCreateFeature#create(ICreateContext)}
*/
protected abstract Object[] doCreate(ICreateContext context);
/**
* Return the model object, that holds all changed objects for the given context
*/
protected EObject getContainerModelObject(ICreateContext context){
return (EObject) getBusinessObjectForPictogramElement(getDiagram());
}
}
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