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.layer0.utils.binaryPredicates;
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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.db.ReadGraph;
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19 import org.simantics.db.Resource;
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20 import org.simantics.db.Statement;
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21 import org.simantics.db.WriteGraph;
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22 import org.simantics.db.common.utils.OrderedSetUtils;
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23 import org.simantics.db.exception.DatabaseException;
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24 import org.simantics.layer0.Layer0;
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25 import org.simantics.utils.datastructures.Pair;
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27 public class OrderedSetElementsPredicate extends BinaryPredicate {
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29 public static final OrderedSetElementsPredicate INSTANCE =
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30 new OrderedSetElementsPredicate();
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33 public Collection<Resource> getObjects(ReadGraph g, Resource subject) throws DatabaseException {
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34 Layer0 l0 = Layer0.getInstance(g);
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35 if(g.isInstanceOf(subject, l0.OrderedSet))
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36 return OrderedSetUtils.toList(g, subject);
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38 return Collections.emptyList();
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42 public Collection<Pair<Resource, Resource>> getStatements(ReadGraph g) {
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43 throw new UnsupportedOperationException();
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47 public Collection<Resource> getSubjects(ReadGraph g, Resource object) throws DatabaseException {
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48 Collection<Resource> result = new ArrayList<Resource>(1);
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49 Layer0 l0 = Layer0.getInstance(g);
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50 for(Statement stat : g.getStatements(object, l0.IsWeaklyRelatedTo)) {
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51 Resource pred = stat.getPredicate();
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52 if(g.isInstanceOf(pred, l0.OrderedSet) && !pred.equals(object))
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59 public boolean has(ReadGraph g, Resource subject, Resource object) throws DatabaseException {
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60 return OrderedSetUtils.contains(g, subject, object) &&
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61 g.isInstanceOf(subject, Layer0.getInstance(g).OrderedSet);
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65 public boolean supportsGetObjects() {
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70 public boolean supportsGetStatements() {
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75 public boolean supportsGetSubjects() {
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80 public void add(WriteGraph g, Resource subject, Resource object) throws DatabaseException {
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81 OrderedSetUtils.add(g, subject, object);
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85 public void remove(WriteGraph g, Resource subject, Resource object) throws DatabaseException {
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86 OrderedSetUtils.remove(g, subject, object);
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90 public boolean supportsAdditions() {
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95 public boolean supportsRemovals() {
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