1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.db.common.request;
14 import org.simantics.db.ReadGraph;
15 import org.simantics.db.Resource;
16 import org.simantics.db.exception.DatabaseException;
17 import org.simantics.layer0.Layer0;
20 * @author Antti Villberg
22 public class IsParent extends ResourceRead2<Boolean> {
24 public IsParent(Resource possibleParent, Resource possibleChild) {
25 super(possibleParent, possibleChild);
29 public Boolean perform(ReadGraph graph) throws DatabaseException {
31 if(resource.equals(resource2)) return true;
33 Layer0 L0 = Layer0.getInstance(graph);
34 Resource parent = graph.getPossibleObject(resource2, L0.PartOf);
35 if(parent == null) return false;
37 return graph.sync(new IsParent(resource, parent));