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;
18 final public class PossibleObjectWithType extends ResourceRead3<Resource> {
20 public PossibleObjectWithType(Resource resource, Resource predicate, Resource type) {
21 super(resource, predicate, type);
25 public Resource perform(ReadGraph graph) throws DatabaseException {
26 Resource result = null;
27 for(Resource object : graph.getObjects(resource, resource2)) {
28 if(graph.isInstanceOf(object, resource3)) {
29 if(result != null) return null;