| /** |
| * 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. |
| */ |
| package org.apache.rya.indexing.geotemporal; |
| |
| import static java.util.Objects.requireNonNull; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Optional; |
| |
| import org.apache.log4j.Logger; |
| import org.apache.rya.indexing.IndexingExpr; |
| import org.apache.rya.indexing.IndexingFunctionRegistry; |
| import org.apache.rya.indexing.IndexingFunctionRegistry.FUNCTION_TYPE; |
| import org.apache.rya.indexing.accumulo.geo.GeoParseUtils; |
| import org.apache.rya.indexing.accumulo.geo.GeoTupleSet; |
| import org.apache.rya.indexing.external.matching.ExternalSetProvider; |
| import org.apache.rya.indexing.external.matching.QuerySegment; |
| import org.apache.rya.indexing.geotemporal.model.EventQueryNode; |
| import org.apache.rya.indexing.geotemporal.model.EventQueryNode.EventQueryNodeBuilder; |
| import org.apache.rya.indexing.geotemporal.storage.EventStorage; |
| import org.eclipse.rdf4j.model.IRI; |
| import org.eclipse.rdf4j.model.ValueFactory; |
| import org.eclipse.rdf4j.model.impl.SimpleValueFactory; |
| import org.eclipse.rdf4j.query.algebra.FunctionCall; |
| import org.eclipse.rdf4j.query.algebra.QueryModelNode; |
| import org.eclipse.rdf4j.query.algebra.StatementPattern; |
| import org.eclipse.rdf4j.query.algebra.Var; |
| import org.eclipse.rdf4j.query.algebra.helpers.AbstractQueryModelVisitor; |
| |
| import com.google.common.collect.HashMultimap; |
| import com.google.common.collect.Multimap; |
| |
| /** |
| * Provides {@link GeoTupleSet}s. |
| */ |
| public class GeoTemporalIndexSetProvider implements ExternalSetProvider<EventQueryNode> { |
| private static final Logger LOG = Logger.getLogger(GeoTemporalIndexSetProvider.class); |
| private static final ValueFactory VF = SimpleValueFactory.getInstance(); |
| |
| //organzied by object var. Each object is a filter, or set of filters |
| private Multimap<Var, IndexingExpr> filterMap; |
| |
| //organzied by subject var. Each subject is a GeoTemporalTupleSet |
| private Multimap<Var, StatementPattern> patternMap; |
| |
| //filters that have not been constrained by statement patterns into indexing expressions yet. |
| private Multimap<Var, FunctionCall> unmatchedFilters; |
| //filters that have been used, to be used by the matcher later. |
| private Multimap<Var, FunctionCall> matchedFilters; |
| |
| //organzied by object var. Used to find matches between unmatch filters and patterns |
| private Map<Var, StatementPattern> objectPatterns; |
| |
| |
| private static IRI filterURI; |
| |
| private final EventStorage eventStorage; |
| |
| public GeoTemporalIndexSetProvider(final EventStorage eventStorage) { |
| this.eventStorage = requireNonNull(eventStorage); |
| } |
| |
| @Override |
| public List<EventQueryNode> getExternalSets(final QuerySegment<EventQueryNode> node) { |
| filterMap = HashMultimap.create(); |
| patternMap = HashMultimap.create(); |
| unmatchedFilters = HashMultimap.create(); |
| matchedFilters = HashMultimap.create(); |
| |
| objectPatterns = new HashMap<>(); |
| //discover entities |
| buildMaps(node); |
| final List<EventQueryNode> nodes = createNodes(); |
| |
| return nodes; |
| } |
| |
| private List<EventQueryNode> createNodes() { |
| final List<EventQueryNode> nodes = new ArrayList<>(); |
| for(final Var subj : patternMap.keySet()) { |
| final EventQueryNode node = getGeoTemporalNode(subj); |
| if(node != null) { |
| nodes.add(node); |
| } |
| } |
| return nodes; |
| } |
| |
| private EventQueryNode getGeoTemporalNode(final Var subj) { |
| final Collection<StatementPattern> patterns = patternMap.get(subj); |
| final Collection<FunctionCall> usedFilters = new ArrayList<>(); |
| Optional<StatementPattern> geoPattern = Optional.empty(); |
| Optional<StatementPattern> temporalPattern = Optional.empty(); |
| Optional<Collection<IndexingExpr>> geoFilters = Optional.empty(); |
| Optional<Collection<IndexingExpr>> temporalFilters = Optional.empty(); |
| |
| //should only be 2 patterns. |
| for(final StatementPattern sp : patterns) { |
| final Var obj = sp.getObjectVar(); |
| |
| ///filter map does not have _const_ |
| |
| |
| if(filterMap.containsKey(obj)) { |
| final Collection<IndexingExpr> filters = filterMap.get(obj); |
| final IndexingFunctionRegistry.FUNCTION_TYPE type = ensureSameType(filters); |
| if(type != null && type == FUNCTION_TYPE.GEO) { |
| geoPattern = Optional.of(sp); |
| geoFilters = Optional.of(filters); |
| usedFilters.addAll(matchedFilters.get(obj)); |
| } else if(type != null && type == FUNCTION_TYPE.TEMPORAL) { |
| temporalPattern = Optional.of(sp); |
| temporalFilters = Optional.of(filters); |
| usedFilters.addAll(matchedFilters.get(obj)); |
| } else { |
| return null; |
| } |
| } else { |
| return null; |
| } |
| } |
| |
| if(geoFilters.isPresent() && temporalFilters.isPresent() && geoPattern.isPresent() && temporalPattern.isPresent()) { |
| return new EventQueryNodeBuilder() |
| .setStorage(eventStorage) |
| .setGeoPattern(geoPattern.get()) |
| .setTemporalPattern(temporalPattern.get()) |
| .setGeoFilters(geoFilters.get()) |
| .setTemporalFilters(temporalFilters.get()) |
| .setUsedFilters(usedFilters) |
| .build(); |
| } else { |
| return null; |
| } |
| } |
| |
| private static FUNCTION_TYPE ensureSameType(final Collection<IndexingExpr> filters) { |
| FUNCTION_TYPE type = null; |
| for(final IndexingExpr filter : filters) { |
| if(type == null) { |
| type = IndexingFunctionRegistry.getFunctionType(filter.getFunction()); |
| } else { |
| if(IndexingFunctionRegistry.getFunctionType(filter.getFunction()) != type) { |
| return null; |
| } |
| } |
| } |
| return type; |
| } |
| |
| private void buildMaps(final QuerySegment<EventQueryNode> node) { |
| final List<QueryModelNode> unused = new ArrayList<>(); |
| for (final QueryModelNode pattern : node.getOrderedNodes()) { |
| if(pattern instanceof FunctionCall) { |
| discoverFilter((FunctionCall) pattern, unused); |
| } |
| if(pattern instanceof StatementPattern) { |
| discoverPatterns((StatementPattern) pattern, unused); |
| } |
| } |
| } |
| |
| private void discoverFilter(final FunctionCall filter, final List<QueryModelNode> unmatched) { |
| try { |
| filter.visit(new FilterVisitor()); |
| } catch (final Exception e) { |
| LOG.error("Failed to match the filter object.", e); |
| } |
| } |
| |
| private void discoverPatterns(final StatementPattern pattern, final List<QueryModelNode> unmatched) { |
| final Var subj = pattern.getSubjectVar(); |
| final Var objVar = pattern.getObjectVar(); |
| |
| patternMap.put(subj, pattern); |
| objectPatterns.put(objVar, pattern); |
| //check for existing filters. |
| if(unmatchedFilters.containsKey(objVar)) { |
| final Collection<FunctionCall> calls = unmatchedFilters.removeAll(objVar); |
| for(final FunctionCall call : calls) { |
| addFilter(call); |
| matchedFilters.put(objVar, call); |
| } |
| } |
| } |
| |
| @Override |
| public Iterator<List<EventQueryNode>> getExternalSetCombos(final QuerySegment<EventQueryNode> segment) { |
| final List<List<EventQueryNode>> comboList = new ArrayList<>(); |
| comboList.add(getExternalSets(segment)); |
| return comboList.iterator(); |
| } |
| |
| private void addFilter(final FunctionCall call) { |
| filterURI = VF.createIRI(call.getURI()); |
| final Var objVar = IndexingFunctionRegistry.getResultVarFromFunctionCall(filterURI, call.getArgs()); |
| filterMap.put(objVar, new IndexingExpr(filterURI, objectPatterns.get(objVar), GeoParseUtils.extractArguments(objVar.getName(), call))); |
| } |
| |
| /** |
| * Finds the object/function in a Filter. If the associated statement pattern |
| * has been found, creates the {@link IndexingExpr} and adds it to the map. |
| */ |
| private class FilterVisitor extends AbstractQueryModelVisitor<Exception> { |
| @Override |
| public void meet(final FunctionCall call) throws Exception { |
| filterURI = VF.createIRI(call.getURI()); |
| final FUNCTION_TYPE type = IndexingFunctionRegistry.getFunctionType(filterURI); |
| if(type == FUNCTION_TYPE.GEO || type == FUNCTION_TYPE.TEMPORAL) { |
| final Var objVar = IndexingFunctionRegistry.getResultVarFromFunctionCall(filterURI, call.getArgs()); |
| if(objectPatterns.containsKey(objVar)) { |
| filterMap.put(objVar, new IndexingExpr(filterURI, objectPatterns.get(objVar), GeoParseUtils.extractArguments(objVar.getName(), call))); |
| matchedFilters.put(objVar, call); |
| } else { |
| unmatchedFilters.put(objVar, call); |
| } |
| } |
| } |
| } |
| } |