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.exception.DatabaseException;
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22 import org.simantics.db.exception.NoInverseException;
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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 RelationChildRule implements ChildRule {
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34 public RelationChildRule(Resource relation, Test test) {
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35 this.relation = relation;
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40 public Collection<?> getChildren(ReadGraph graph, Object parent) throws DatabaseException {
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41 Collection<Resource> result = graph.getObjects((Resource)parent, relation);
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43 ArrayList<Resource> filtered = new ArrayList<Resource>(result.size());
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44 for(Resource r : result)
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45 if(test.test(graph, r))
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53 public Collection<?> getParents(ReadGraph graph, Object child)
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54 throws DatabaseException {
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56 if(child instanceof Resource) {
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57 Resource inverse = graph.getInverse(relation);
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58 return graph.getObjects((Resource)child, inverse);
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60 } catch(NoInverseException e) {
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62 return Collections.emptyList();
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66 public boolean isCompatible(Class<?> contentType) {
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67 return contentType.equals(Resource.class);
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