Package org.hibernate.persister.entity

Source Code of org.hibernate.persister.entity.NamedQueryLoader

/*
* 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.persister.entity;

import java.io.Serializable;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.hibernate.FlushMode;
import org.hibernate.HibernateException;
import org.hibernate.LockOptions;
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
* @author Steve Ebersole
*/
public final class NamedQueryLoader implements UniqueEntityLoader {
  private final String queryName;
  private final EntityPersister persister;
 
  private static final Logger log = LoggerFactory.getLogger(NamedQueryLoader.class);

  public NamedQueryLoader(String queryName, EntityPersister persister) {
    super();
    this.queryName = queryName;
    this.persister = persister;
  }

  public Object load(Serializable id, Object optionalObject, SessionImplementor session, LockOptions lockOptions) {
    if ( lockOptions != null ) {
      log.debug( "Ignoring lock-options passed to named query loader" );
    }
    return load( id, optionalObject, session );
  }

  public Object load(Serializable id, Object optionalObject, SessionImplementor session) {
    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() ) );

  }
}
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