1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.db.common.request;
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14 import org.simantics.db.ReadGraph;
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15 import org.simantics.db.Resource;
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16 import org.simantics.db.common.utils.NameUtils;
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17 import org.simantics.db.exception.DatabaseException;
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18 import org.simantics.db.exception.NoSingleResultException;
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21 * @author Tuukka Lehtonen
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23 public final class SingleObjectWithType extends ResourceRead3<Resource> {
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25 public SingleObjectWithType(Resource resource, Resource predicate, Resource type) {
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26 super(resource, predicate, type);
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30 public Resource perform(ReadGraph graph) throws DatabaseException {
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31 Resource result = null;
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32 for (Resource object : graph.getObjects(resource, resource2)) {
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33 if (graph.isInstanceOf(object, resource3)) {
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35 throw new NoSingleResultException("More than 1 objects for relation "
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36 + NameUtils.getSafeName(graph, resource2) + " with type "
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37 + NameUtils.getSafeName(graph, resource3) + " at "
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38 + NameUtils.getSafeName(graph, resource));
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45 throw new NoSingleResultException("No objects for relation "
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46 + NameUtils.getSafeName(graph, resource2) + " with type "
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47 + NameUtils.getSafeName(graph, resource3) + " at "
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48 + NameUtils.getSafeName(graph, resource));
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