| package org.apache.rya.indexing.statement.metadata.matching; |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.apache.rya.api.RdfCloudTripleStoreConfiguration; |
| import org.apache.rya.api.domain.RyaIRI; |
| import org.apache.rya.api.resolver.RdfToRyaConversions; |
| import org.apache.rya.indexing.external.matching.ExternalSetProvider; |
| import org.apache.rya.indexing.external.matching.QuerySegment; |
| import org.eclipse.rdf4j.model.IRI; |
| import org.eclipse.rdf4j.model.vocabulary.RDF; |
| import org.eclipse.rdf4j.query.algebra.QueryModelNode; |
| import org.eclipse.rdf4j.query.algebra.StatementPattern; |
| import org.eclipse.rdf4j.query.algebra.Var; |
| |
| import com.google.common.collect.HashMultimap; |
| import com.google.common.collect.Multimap; |
| |
| /** |
| * This class extracts all valid {@Link StatementMetadataNode}s from the provided {@link QuerySegment}s. |
| * |
| */ |
| public class StatementMetadataExternalSetProvider implements ExternalSetProvider<StatementMetadataNode<?>> { |
| |
| private List<RyaIRI> expectedURI = Arrays.asList(RdfToRyaConversions.convertIRI(OWLReify.SOURCE), |
| RdfToRyaConversions.convertIRI(OWLReify.PROPERTY), RdfToRyaConversions.convertIRI(OWLReify.TARGET), |
| RdfToRyaConversions.convertIRI(RDF.TYPE)); |
| private Multimap<Var, StatementPattern> reifiedQueries; |
| private Set<RyaIRI> metadataProperties; |
| private RdfCloudTripleStoreConfiguration conf; |
| |
| public StatementMetadataExternalSetProvider(RdfCloudTripleStoreConfiguration conf) { |
| this.metadataProperties = conf.getStatementMetadataProperties(); |
| this.conf = conf; |
| } |
| |
| /** |
| * This method extracts all {@link StatementMetadataNode}s from the provided {@link QuerySegment}. |
| * It looks through the provided QuerySegment for all combinations of {@link StatementPattern}s that |
| * represent a reified query and combines those into a StatementPatternNode. A StatementPattern cannot |
| * be used in more than one reified query and StatementPatternNode. |
| */ |
| @Override |
| public List<StatementMetadataNode<?>> getExternalSets(QuerySegment<StatementMetadataNode<?>> segment) { |
| |
| reifiedQueries = HashMultimap.create(); |
| |
| List<StatementMetadataNode<?>> metadataList = new ArrayList<>(); |
| for (QueryModelNode node : segment.getUnOrderedNodes()) { |
| if (node instanceof StatementPattern) { |
| StatementPattern sp = (StatementPattern) node; |
| reifiedQueries.put(sp.getSubjectVar(), sp); |
| } |
| } |
| |
| for (Var var : reifiedQueries.keySet()) { |
| Collection<StatementPattern> patterns = removeInvalidProperties(reifiedQueries.get(var)); |
| if (StatementMetadataNode.verifyHasCorrectTypePattern(patterns)) { |
| metadataList.add(new StatementMetadataNode<>(patterns, conf)); |
| } |
| } |
| |
| return metadataList; |
| } |
| |
| @Override |
| public Iterator<List<StatementMetadataNode<?>>> getExternalSetCombos( |
| QuerySegment<StatementMetadataNode<?>> segment) { |
| Set<List<StatementMetadataNode<?>>> combos = new HashSet<>(); |
| combos.add(getExternalSets(segment)); |
| return combos.iterator(); |
| } |
| |
| private Set<StatementPattern> removeInvalidProperties(Collection<StatementPattern> patterns) { |
| |
| Set<StatementPattern> finalPatterns = new HashSet<>(); |
| |
| for (StatementPattern pattern : patterns) { |
| Var var = pattern.getPredicateVar(); |
| if (var.getValue() != null && var.getValue() instanceof IRI) { |
| RyaIRI uri = RdfToRyaConversions.convertIRI((IRI) var.getValue()); |
| if(expectedURI.contains(uri) || metadataProperties.contains(uri)) { |
| finalPatterns.add(pattern); |
| } |
| } |
| } |
| return finalPatterns; |
| } |
| |
| } |