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/*****************************************************************************
* Copyright (c) 2017 EclipseSource and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* EclipseSource - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.emf.facet.custom.ui.internal.query;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jface.viewers.ITreeContentProvider;
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;
/**
* <p>
* Default implementation of the #parent customization operation. This implementation
* returns the {@link EObject#eContainer() EObject's container}.
* </p>
* <p>
* The #parent customization operation is used to customize the behavior of {@link ITreeContentProvider#getParent(Object)},
* used to efficiently reveal elements in a custom tree structure.
* </p>
* <p>
* This default implementation is sufficient when displaying the natural containment tree,
* even if the intermediate references are customized. It should however be customized when
* removing natural containers (e.g. when simplifying the tree structure) or introducing
* a custom containment tree (e.g. when moving an element to a different parent)
* </p>
*
* @since 3.1
*/
public class DefaultGetParentQuery implements IJavaQuery2<EObject, EObject> {
/**
* @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 EObject evaluate(EObject source, IParameterValueList2 parameterValues, IFacetManager facetManager) throws DerivedTypedElementException {
return source.eContainer();
}
}
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