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/*****************************************************************************
* Copyright (c) 2010-2011 CEA LIST.
*
*
* 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:
*
* Yann Tanguy (CEA LIST) yann.tanguy@cea.fr - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.uml.service.types.helper;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.gmf.runtime.common.core.command.ICommand;
import org.eclipse.gmf.runtime.common.core.command.IdentityCommand;
import org.eclipse.gmf.runtime.common.core.command.UnexecutableCommand;
import org.eclipse.gmf.runtime.emf.type.core.commands.CreateRelationshipCommand;
import org.eclipse.gmf.runtime.emf.type.core.requests.CreateRelationshipRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.ReorientRelationshipRequest;
import org.eclipse.papyrus.uml.service.types.command.GeneralizationReorientCommand;
import org.eclipse.uml2.uml.Classifier;
import org.eclipse.uml2.uml.UMLPackage;
/**
* This helper provides edit commands for UML {@link Generalization}.
*/
public class GeneralizationEditHelper extends DirectedRelationshipEditHelper {
/**
* {@inheritDoc}
*/
@Override
protected EReference getSourceReference() {
return UMLPackage.eINSTANCE.getGeneralization_Specific();
}
/**
* {@inheritDoc}
*/
@Override
protected EReference getTargetReference() {
return UMLPackage.eINSTANCE.getGeneralization_General();
}
/**
* {@inheritDoc}
*/
@Override
protected boolean canCreate(EObject source, EObject target) {
if ((source != null) && !(source instanceof Classifier)) {
return false;
}
if ((target != null) && !(target instanceof Classifier)) {
return false;
}
if ((source != null) && (target != null) && (source == target)) {
return false;
}
return true;
}
/**
* {@inheritDoc}
*/
@Override
protected ICommand getCreateRelationshipCommand(CreateRelationshipRequest req) {
EObject source = req.getSource();
EObject target = req.getTarget();
boolean noSourceOrTarget = (source == null || target == null);
boolean noSourceAndTarget = (source == null && target == null);
if (!noSourceAndTarget && !canCreate(source, target)) {
// Abort creation.
return UnexecutableCommand.INSTANCE;
}
if(noSourceOrTarget && !noSourceAndTarget) {
// The request isn't complete yet. Return the identity command so
// that the create relationship gesture is enabled.
return IdentityCommand.INSTANCE;
}
// Propose a container if none is set in request.
EObject proposedContainer = source;
req.setContainer(proposedContainer);
return new CreateRelationshipCommand(req);
}
/**
* {@inheritDoc}
*/
@Override
protected ICommand getReorientRelationshipCommand(ReorientRelationshipRequest req) {
return new GeneralizationReorientCommand(req);
}
}
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