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/*****************************************************************************
* Copyright (c) 2012 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:
* Camille Letavernier (CEA LIST) camille.letavernier@cea.fr - Initial API and implementation
*****************************************************************************/
package org.eclipse.papyrus.infra.gmfdiag.common.helper;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.papyrus.infra.emf.utils.EMFHelper;
/**
* A Helper class related to the GMF Notation metamodel.
*
* @author Camille Letavernier
*/
public class NotationHelper {
/**
* Retrieves the GMF View associated to the source object
*
* @param source
* the source
* @return the resolved view, or null if it cannot be found
*/
public static View findView(Object source) {
if(source instanceof View) {
return (View)source;
}
if(source instanceof IAdaptable) {
IAdaptable adaptable = (IAdaptable)source;
Object adapter = adaptable.getAdapter(View.class);
if(adapter != null) {
return (View)adapter;
}
adapter = EMFHelper.getEObject(adaptable);
if(adapter instanceof View) {
return (View)adapter;
}
}
return null;
}
/**
* Tests whether the given View is a reference to an external element.
* A view is an external reference if its graphical container is different from its semantic
* container (i.e. self.element.eContainer() != self.primaryView.eContainer().element)
*
* @param diagramElement
* @return
*/
public static boolean isExternalRef(View diagramElement) {
if(diagramElement == null) {
return false;
}
View primaryView = SemanticElementHelper.findTopView(diagramElement);
if(primaryView == null) {
return false;
}
EObject semanticElement = primaryView.getElement();
if(semanticElement == null) {
return false;
}
EObject parentView = primaryView.eContainer();
if(!(parentView instanceof View)) {
return false;
}
EObject parentSemanticElement = ((View)parentView).getElement();
if(parentSemanticElement == null) {
return false;
}
//Relax the constraints for elements displayed on themselves (e.g. Frame in Composite Structure Diagram)
return parentSemanticElement != semanticElement.eContainer() && parentSemanticElement != semanticElement;
}
}
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