//$Id: NamedQueryLoader.java 10019 2006-06-15 07:50:12Z steve.ebersole@jboss.com $
package org.hibernate.persister.entity;
import java.io.Serializable;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.FlushMode;
import org.hibernate.HibernateException;
import org.hibernate.engine.EntityKey;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.impl.AbstractQueryImpl;
import org.hibernate.loader.entity.UniqueEntityLoader;
/**
* Not really a <tt>Loader</tt>, just a wrapper around a
* named query.
* @author Gavin King
*/
public final class NamedQueryLoader implements UniqueEntityLoader {
private final String queryName;
private final EntityPersister persister;
private static final Log log = LogFactory.getLog(NamedQueryLoader.class);
public NamedQueryLoader(String queryName, EntityPersister persister) {
super();
this.queryName = queryName;
this.persister = persister;
}
public Object load(Serializable id, Object optionalObject, SessionImplementor session)
throws HibernateException {
if ( log.isDebugEnabled() ) {
log.debug(
"loading entity: " + persister.getEntityName() +
" using named query: " + queryName
);
}
AbstractQueryImpl query = (AbstractQueryImpl) session.getNamedQuery(queryName);
if ( query.hasNamedParameters() ) {
query.setParameter(
query.getNamedParameters()[0],
id,
persister.getIdentifierType()
);
}
else {
query.setParameter( 0, id, persister.getIdentifierType() );
}
query.setOptionalId(id);
query.setOptionalEntityName( persister.getEntityName() );
query.setOptionalObject(optionalObject);
query.setFlushMode( FlushMode.MANUAL );
query.list();
// now look up the object we are really interested in!
// (this lets us correctly handle proxies and multi-row
// or multi-column queries)
return session.getPersistenceContext()
.getEntity( new EntityKey( id, persister, session.getEntityMode() ) );
}
}