| /* |
| * Copyright 2008 Alin Dreghiciu. |
| * |
| * Licensed 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.zest.index.rdf.query; |
| |
| import java.util.Map; |
| import org.openrdf.query.QueryLanguage; |
| import org.apache.zest.api.composite.Composite; |
| import org.apache.zest.api.entity.EntityReference; |
| import org.apache.zest.api.injection.scope.Service; |
| import org.apache.zest.api.injection.scope.This; |
| import org.apache.zest.api.mixin.Mixins; |
| import org.apache.zest.api.query.grammar.OrderBy; |
| import org.apache.zest.api.query.grammar.QuerySpecification; |
| import org.apache.zest.api.service.ServiceComposite; |
| import org.apache.zest.functional.Specification; |
| import org.apache.zest.spi.query.EntityFinder; |
| import org.apache.zest.spi.query.EntityFinderException; |
| |
| /** |
| * JAVADOC Add JavaDoc |
| */ |
| @Mixins( { RdfQueryService.RdfEntityFinderMixin.class } ) |
| public interface RdfQueryService |
| extends EntityFinder, RdfQueryParserFactory, ServiceComposite |
| { |
| /** |
| * JAVADOC Add JavaDoc |
| */ |
| public static class RdfEntityFinderMixin |
| implements EntityFinder |
| { |
| |
| private static final QueryLanguage language = QueryLanguage.SPARQL; |
| |
| @Service |
| private RdfQueryParserFactory queryParserFactory; |
| |
| @This |
| TupleQueryExecutor tupleExecutor; |
| |
| @Override |
| public Iterable<EntityReference> findEntities( Class<?> resultType, |
| Specification<Composite> whereClause, |
| 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(); |
| |
| } 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(); |
| } |
| } |
| |
| @Override |
| public EntityReference findEntity( Class<?> resultType, Specification<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, Specification<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 ); |
| } |
| } |
| } |
| } |