1 /*******************************************************************************
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2 * Copyright (c) 2010, 2011 Association for Decentralized Information Management in
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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.browsing.ui.model.children;
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14 import java.util.ArrayList;
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15 import java.util.Collection;
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16 import java.util.Collections;
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18 import org.simantics.browsing.ui.model.tests.Test;
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19 import org.simantics.db.ReadGraph;
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20 import org.simantics.db.Resource;
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21 import org.simantics.db.Statement;
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22 import org.simantics.db.exception.DatabaseException;
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25 * A child rule that says that there is exactly one child node whose content
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26 * is equal to the content of the parent.
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27 * @author Hannu Niemistö
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29 public class RelationStatementRule implements ChildRule {
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33 public RelationStatementRule(Resource relation, Test test) {
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34 this.relation = relation;
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38 public Collection<?> getChildren(ReadGraph graph, Object parent) throws DatabaseException {
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39 ArrayList<Statement> result = new ArrayList<Statement>();
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40 for(Resource property : graph.getPredicates((Resource)parent)) {
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41 if(graph.isSubrelationOf(property, relation)) {
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42 result.addAll(graph.getStatements((Resource)parent, property));
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49 public Collection<?> getParents(ReadGraph graph, Object child)
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50 throws DatabaseException {
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51 return Collections.emptyList();
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55 public boolean isCompatible(Class<?> contentType) {
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56 return contentType.equals(Resource.class);
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