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/*****************************************************************************
* Copyright (c) 2016 CEA LIST 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
*
*****************************************************************************/
package org.eclipse.papyrus.emf.facet.custom.ui.internal.query;
import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.papyrus.emf.facet.efacet.core.IFacetManager;
import org.eclipse.papyrus.emf.facet.efacet.core.exception.DerivedTypedElementException;
import org.eclipse.papyrus.emf.facet.query.java.core.IJavaQuery2;
import org.eclipse.papyrus.emf.facet.query.java.core.IParameterValueList2;
/**
* @author Camille Letavernier
*
*/
public class DefaultVisibleReferencesQuery implements IJavaQuery2<EObject, List<EReference>> {
/**
* @see org.eclipse.papyrus.emf.facet.query.java.core.IJavaQuery2#evaluate(org.eclipse.emf.ecore.EObject, org.eclipse.papyrus.emf.facet.query.java.core.IParameterValueList2, org.eclipse.papyrus.emf.facet.efacet.core.IFacetManager)
*
* @param source
* @param parameterValues
* @param facetManager
* @return
* @throws DerivedTypedElementException
*/
@Override
public List<EReference> evaluate(EObject source, IParameterValueList2 parameterValues, IFacetManager facetManager) throws DerivedTypedElementException {
return source.eClass().getEAllReferences().stream().filter(
ref -> !isEmpty(ref, source) //
).collect(Collectors.toList());
}
private boolean isEmpty(EReference reference, EObject source) {
Object value = source.eGet(reference);
if (value == null) {
return true;
}
if (value instanceof Collection) {
return ((Collection<?>) value).isEmpty();
}
return false;
}
}
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