/*
* Hibernate OGM, Domain model persistence for NoSQL datastores
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.ogm.datastore.mongodb.query.parsing.impl;
import java.util.Map;
import org.hibernate.SessionFactory;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.hql.QueryParser;
import org.hibernate.hql.ast.spi.EntityNamesResolver;
import org.hibernate.ogm.datastore.mongodb.logging.impl.Log;
import org.hibernate.ogm.datastore.mongodb.logging.impl.LoggerFactory;
import org.hibernate.ogm.query.spi.BaseQueryParserService;
import org.hibernate.ogm.query.spi.QueryParserService;
import org.hibernate.ogm.query.spi.QueryParsingResult;
import org.hibernate.ogm.service.impl.SessionFactoryEntityNamesResolver;
import com.mongodb.DBObject;
/**
* A {@link QueryParserService} implementation which creates MongoDB queries in form of {@link DBObject}s.
*
* @author Gunnar Morling
*/
public class MongoDBBasedQueryParserService extends BaseQueryParserService {
private static final Log log = LoggerFactory.getLogger();
private volatile SessionFactoryEntityNamesResolver entityNamesResolver;
@Override
public QueryParsingResult parseQuery(SessionFactoryImplementor sessionFactory, String queryString, Map<String, Object> namedParameters) {
QueryParser queryParser = new QueryParser();
MongoDBProcessingChain processingChain = createProcessingChain( sessionFactory, unwrap( namedParameters ) );
MongoDBQueryParsingResult result = queryParser.parseQuery( queryString, processingChain );
log.createdQuery( queryString, result );
return result;
}
@Override
public QueryParsingResult parseQuery(SessionFactoryImplementor sessionFactory, String queryString) {
throw new UnsupportedOperationException( "MongoDB does not support parameterized queries. Parameter values " +
"must be passed to the query parser." );
}
@Override
public boolean supportsParameters() {
return false;
}
private MongoDBProcessingChain createProcessingChain(SessionFactoryImplementor sessionFactory, Map<String, Object> namedParameters) {
EntityNamesResolver entityNamesResolver = getDefinedEntityNames( sessionFactory );
return new MongoDBProcessingChain(
sessionFactory,
entityNamesResolver,
namedParameters );
}
private EntityNamesResolver getDefinedEntityNames(SessionFactory sessionFactory) {
if ( entityNamesResolver == null ) {
entityNamesResolver = new SessionFactoryEntityNamesResolver( sessionFactory );
}
return entityNamesResolver;
}
}