Package org.hibernate.persister.entity

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

* Hibernate, Relational Persistence for Idiomatic Java
* Copyright (c) 2008-2011, Red Hat Inc. 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 Inc.
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* 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.
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* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
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package org.hibernate.persister.entity;


import org.hibernate.FlushMode;
import org.hibernate.LockOptions;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.internal.AbstractQueryImpl;
import org.hibernate.internal.CoreLogging;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.loader.entity.UniqueEntityLoader;

* Not really a Loader, just a wrapper around a named query.  Used when the metadata has named a query to use for
* loading an entity (using {@link org.hibernate.annotations.Loader} or {@code <loader/>}).
* @author Gavin King
* @author Steve Ebersole
public final class NamedQueryLoader implements UniqueEntityLoader {
  private static final CoreMessageLogger LOG = CoreLogging.messageLogger( NamedQueryLoader.class );

  private final String queryName;
  private final EntityPersister persister;

   * Constructs the NamedQueryLoader
   * @param queryName The name of the named query to use
   * @param persister The corresponding persister for the entity we are loading
  public NamedQueryLoader(String queryName, EntityPersister persister) {
    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) {
    LOG.debugf( "Loading entity: %s using named query: %s", persister.getEntityName(), queryName );

    // IMPL NOTE: essentially we perform the named query (which loads the entity into the PC), and then
    // do an internal lookup of the entity from the PC.

    final 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 );

    // 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( session.generateEntityKey( id, persister ) );


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