org.hibernate.loader.entity.CollectionElementLoader Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*
*/
package org.hibernate.loader.entity;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.hibernate.HibernateException;
import org.hibernate.LockMode;
import org.hibernate.MappingException;
import org.hibernate.engine.SessionFactoryImplementor;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.engine.LoadQueryInfluencers;
import org.hibernate.loader.JoinWalker;
import org.hibernate.loader.OuterJoinLoader;
import org.hibernate.persister.collection.QueryableCollection;
import org.hibernate.persister.entity.OuterJoinLoadable;
import org.hibernate.transform.ResultTransformer;
import org.hibernate.type.Type;
import org.hibernate.util.ArrayHelper;
/**
*
*
* @author Gavin King
*/
public class CollectionElementLoader extends OuterJoinLoader {
private static final Logger log = LoggerFactory.getLogger(CollectionElementLoader.class);
private final OuterJoinLoadable persister;
private final Type keyType;
private final Type indexType;
private final String entityName;
public CollectionElementLoader(
QueryableCollection collectionPersister,
SessionFactoryImplementor factory,
LoadQueryInfluencers loadQueryInfluencers) throws MappingException {
super( factory, loadQueryInfluencers );
this.keyType = collectionPersister.getKeyType();
this.indexType = collectionPersister.getIndexType();
this.persister = (OuterJoinLoadable) collectionPersister.getElementPersister();
this.entityName = persister.getEntityName();
JoinWalker walker = new EntityJoinWalker(
persister,
ArrayHelper.join(
collectionPersister.getKeyColumnNames(),
collectionPersister.getIndexColumnNames()
),
1,
LockMode.NONE,
factory,
loadQueryInfluencers
);
initFromWalker( walker );
postInstantiate();
log.debug( "Static select for entity " + entityName + ": " + getSQLString() );
}
public Object loadElement(SessionImplementor session, Object key, Object index)
throws HibernateException {
List list = loadEntity(
session,
key,
index,
keyType,
indexType,
persister
);
if ( list.size()==1 ) {
return list.get(0);
}
else if ( list.size()==0 ) {
return null;
}
else {
if ( getCollectionOwners()!=null ) {
return list.get(0);
}
else {
throw new HibernateException("More than one row was found");
}
}
}
protected Object getResultColumnOrRow(
Object[] row,
ResultTransformer transformer,
ResultSet rs, SessionImplementor session)
throws SQLException, HibernateException {
return row[row.length-1];
}
protected boolean isSingleRowLoader() {
return true;
}
}