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.Collection;
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15 import java.util.Collections;
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17 import org.simantics.browsing.ui.model.tests.Test;
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18 import org.simantics.db.ReadGraph;
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19 import org.simantics.db.exception.DatabaseException;
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22 * A child rule that follows the given relation. Content type of both parent
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23 * and child node types must be Resources.
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24 * @author Hannu Niemistö
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26 public class EqualContentChildRule implements ChildRule {
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29 public EqualContentChildRule(Test condition) {
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33 public Collection<?> getChildren(ReadGraph graph, Object parent) throws DatabaseException {
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34 if(condition != null && !condition.test(graph, parent))
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35 return Collections.emptyList();
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37 return Collections.singletonList(parent);
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41 public Collection<?> getParents(ReadGraph graph, Object child) throws DatabaseException {
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42 if(condition != null && !condition.test(graph, child))
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43 return Collections.emptyList();
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45 return Collections.singletonList(child);
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49 public boolean isCompatible(Class<?> contentType) {
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50 if(condition == null)
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53 return condition.isCompatible(contentType);
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