/*****************************************************************************
* Copyright (c) 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:
* Camille Letavernier (CEA LIST) camille.letavernier@cea.fr - Initial API and implementation
*****************************************************************************/
package org.eclipse.papyrus.views.modelexplorer.widgets;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.papyrus.infra.widgets.providers.AbstractTreeFilter;
/**
* A class to retain all elements that are instance of the
* given metaclass.
*
* The parent elements of retained elements are also retained.
*
* @author Camille Letavernier
*
*/
public class MetaclassViewerFilter extends AbstractTreeFilter {
protected Object metaclass;
public MetaclassViewerFilter(Object selectedMetaClass) {
this.metaclass = selectedMetaClass;
}
@Override
public boolean isVisible(Viewer viewer, Object parentElement, Object element) {
if(metaclass == null || !(metaclass instanceof EClass)) {
return false;
}
EClass eClass = (EClass)metaclass;
if(element instanceof IAdaptable) {
EObject eObject = (EObject)((IAdaptable)element).getAdapter(EObject.class);
if(eObject != null) {
element = eObject;
}
}
if(element instanceof EObject) {
return eClass.isInstance(element);
}
return false;
}
}