| /* |
| * 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.polygene.index.rdf.query; |
| |
| import java.util.List; |
| import java.util.Map; |
| import java.util.function.Predicate; |
| import java.util.stream.Stream; |
| import org.apache.polygene.api.composite.Composite; |
| import org.apache.polygene.api.entity.EntityReference; |
| import org.apache.polygene.api.injection.scope.Service; |
| import org.apache.polygene.api.injection.scope.This; |
| import org.apache.polygene.api.mixin.Mixins; |
| import org.apache.polygene.api.query.grammar.OrderBy; |
| import org.apache.polygene.api.query.grammar.QuerySpecification; |
| import org.apache.polygene.spi.query.EntityFinder; |
| import org.apache.polygene.spi.query.EntityFinderException; |
| import org.openrdf.query.QueryLanguage; |
| |
| /** |
| * JAVADOC Add JavaDoc |
| */ |
| @Mixins( { RdfQueryService.RdfEntityFinderMixin.class } ) |
| public interface RdfQueryService |
| extends EntityFinder, RdfQueryParserFactory |
| { |
| /** |
| * JAVADOC Add JavaDoc |
| */ |
| class RdfEntityFinderMixin |
| implements EntityFinder |
| { |
| |
| private static final QueryLanguage language = QueryLanguage.SPARQL; |
| |
| @Service |
| private RdfQueryParserFactory queryParserFactory; |
| |
| @This |
| TupleQueryExecutor tupleExecutor; |
| |
| @Override |
| public Stream<EntityReference> findEntities( Class<?> resultType, |
| Predicate<Composite> whereClause, |
| List<OrderBy> orderBySegments, |
| Integer firstResult, |
| Integer maxResults, |
| Map<String, Object> variables ) throws EntityFinderException |
| { |
| CollectingQualifiedIdentityResultCallback collectingCallback = new CollectingQualifiedIdentityResultCallback(); |
| |
| if( QuerySpecification.isQueryLanguage( "SERQL", whereClause )) |
| { |
| String query = ((QuerySpecification)whereClause).query(); |
| tupleExecutor.performTupleQuery( QueryLanguage.SERQL, query, variables, collectingCallback ); |
| return collectingCallback.entities().stream(); |
| |
| } else |
| { |
| RdfQueryParser rdfQueryParser = queryParserFactory.newQueryParser( language ); |
| String query = rdfQueryParser.constructQuery( resultType, whereClause, orderBySegments, firstResult, maxResults, variables ); |
| |
| tupleExecutor.performTupleQuery( language, query, variables, collectingCallback ); |
| return collectingCallback.entities().stream(); |
| } |
| } |
| |
| @Override |
| public EntityReference findEntity( Class<?> resultType, Predicate<Composite> whereClause, Map<String, Object> variables ) |
| throws EntityFinderException |
| { |
| final SingleQualifiedIdentityResultCallback singleCallback = new SingleQualifiedIdentityResultCallback(); |
| |
| if (QuerySpecification.isQueryLanguage( "SERQL", whereClause)) |
| { |
| String query = ((QuerySpecification)whereClause).query(); |
| tupleExecutor.performTupleQuery( QueryLanguage.SERQL, query, variables, singleCallback ); |
| return singleCallback.qualifiedIdentity(); |
| } else |
| { |
| RdfQueryParser rdfQueryParser = queryParserFactory.newQueryParser( language ); |
| String query = rdfQueryParser.constructQuery( resultType, whereClause, null, null, null, variables ); |
| tupleExecutor.performTupleQuery( QueryLanguage.SPARQL, query, variables, singleCallback ); |
| return singleCallback.qualifiedIdentity(); |
| } |
| } |
| |
| @Override |
| public long countEntities( Class<?> resultType, Predicate<Composite> whereClause, Map<String, Object> variables ) |
| throws EntityFinderException |
| { |
| if (QuerySpecification.isQueryLanguage( "SERQL", whereClause )) |
| { |
| String query = ((QuerySpecification)whereClause).query(); |
| return tupleExecutor.performTupleQuery( QueryLanguage.SERQL, query, variables, null ); |
| |
| } else |
| { |
| RdfQueryParser rdfQueryParser = queryParserFactory.newQueryParser( language ); |
| String query = rdfQueryParser.constructQuery( resultType, whereClause, null, null, null, variables ); |
| return tupleExecutor.performTupleQuery( language, query, variables, null ); |
| } |
| } |
| } |
| } |