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.Arrays;
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15 import java.util.Collection;
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16 import java.util.Collections;
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17 import java.util.HashSet;
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18 import java.util.Iterator;
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19 import java.util.Set;
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21 import org.simantics.db.Resource;
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22 import org.simantics.db.ReadGraph;
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23 import org.simantics.db.WriteGraph;
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24 import org.simantics.db.exception.DatabaseException;
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25 import org.simantics.utils.datastructures.Pair;
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27 public class UnionPredicate extends BinaryPredicate {
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29 Collection<IBinaryPredicate> predicates;
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31 public UnionPredicate(Collection<IBinaryPredicate> predicates) {
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32 this.predicates = predicates;
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35 public UnionPredicate(IBinaryPredicate ... predicates) {
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36 this(Arrays.asList(predicates));
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40 public Collection<Resource> getObjects(ReadGraph g, Resource subject) throws DatabaseException {
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41 Iterator<IBinaryPredicate> it = predicates.iterator();
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43 while(it.hasNext()) {
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44 Collection<Resource> result = it.next().getObjects(g, subject);
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45 if(!result.isEmpty()) {
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46 while(it.hasNext()) {
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47 Collection<Resource> temp = it.next().getObjects(g, subject);
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48 if(!temp.isEmpty()) {
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49 Set<Resource> merged = new HashSet<Resource>(result.size() + temp.size());
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50 merged.addAll(result);
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51 merged.addAll(temp);
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53 merged.addAll(it.next().getObjects(g, subject));
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60 return Collections.emptyList();
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64 public Collection<Pair<Resource, Resource>> getStatements(ReadGraph g) throws DatabaseException {
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65 Iterator<IBinaryPredicate> it = predicates.iterator();
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67 while(it.hasNext()) {
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68 Collection<Pair<Resource, Resource>> result = it.next().getStatements(g);
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69 if(!result.isEmpty()) {
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70 while(it.hasNext()) {
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71 Collection<Pair<Resource, Resource>> temp = it.next().getStatements(g);
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72 if(!temp.isEmpty()) {
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73 Set<Pair<Resource, Resource>> merged = new HashSet<Pair<Resource, Resource>>(result.size() + temp.size());
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74 merged.addAll(result);
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75 merged.addAll(temp);
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77 merged.addAll(it.next().getStatements(g));
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84 return Collections.emptyList();
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88 public Collection<Resource> getSubjects(ReadGraph g, Resource object) throws DatabaseException {
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89 Iterator<IBinaryPredicate> it = predicates.iterator();
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91 while(it.hasNext()) {
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92 Collection<Resource> result = it.next().getSubjects(g, object);
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93 if(!result.isEmpty()) {
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94 while(it.hasNext()) {
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95 Collection<Resource> temp = it.next().getSubjects(g, object);
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96 if(!temp.isEmpty()) {
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97 Set<Resource> merged = new HashSet<Resource>(result.size() + temp.size());
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98 merged.addAll(result);
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99 merged.addAll(temp);
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100 while(it.hasNext())
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101 merged.addAll(it.next().getSubjects(g, object));
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108 return Collections.emptyList();
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112 public boolean has(ReadGraph g, Resource subject, Resource object) throws DatabaseException {
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113 for(IBinaryPredicate pred : predicates)
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114 if(pred.has(g, subject, object))
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120 public boolean supportsGetObjects() {
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121 for(IBinaryPredicate pred : predicates)
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122 if(!pred.supportsGetObjects())
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128 public boolean supportsGetStatements() {
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129 for(IBinaryPredicate pred : predicates)
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130 if(!pred.supportsGetStatements())
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136 public boolean supportsGetSubjects() {
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137 for(IBinaryPredicate pred : predicates)
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138 if(!pred.supportsGetSubjects())
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144 public void add(WriteGraph g, Resource subject, Resource object) {
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145 throw new UnsupportedOperationException();
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149 public void remove(WriteGraph g, Resource subject, Resource object) {
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150 throw new UnsupportedOperationException();
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154 public boolean supportsAdditions() {
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159 public boolean supportsRemovals() {
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164 public int hashCode() {
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165 final int prime = 31;
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167 result = prime * result
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168 + ((predicates == null) ? 0 : predicates.hashCode());
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173 public boolean equals(Object obj) {
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178 if (getClass() != obj.getClass())
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180 UnionPredicate other = (UnionPredicate) obj;
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181 if (predicates == null) {
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182 if (other.predicates != null)
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184 } else if (!predicates.equals(other.predicates))
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