Package org.hibernate.persister.collection

Source Code of org.hibernate.persister.collection.NamedQueryCollectionInitializer

/*
* 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.collection;

import java.io.Serializable;

import org.hibernate.FlushMode;
import org.hibernate.HibernateException;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.impl.AbstractQueryImpl;
import org.hibernate.loader.collection.CollectionInitializer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
* A wrapper around a named query.
* @author Gavin King
*/
public final class NamedQueryCollectionInitializer implements CollectionInitializer {
  private final String queryName;
  private final CollectionPersister persister;
 
  private static final Logger log = LoggerFactory.getLogger(NamedQueryCollectionInitializer.class);

  public NamedQueryCollectionInitializer(String queryName, CollectionPersister persister) {
    super();
    this.queryName = queryName;
    this.persister = persister;
  }

  public void initialize(Serializable key, SessionImplementor session)
  throws HibernateException {
   
    if ( log.isDebugEnabled() ) {
      log.debug(
          "initializing collection: " +
          persister.getRole() +
          " using named query: " +
          queryName
        );
    }
   
    //TODO: is there a more elegant way than downcasting?
    AbstractQueryImpl query = (AbstractQueryImpl) session.getNamedSQLQuery(queryName);
    if ( query.getNamedParameters().length>0 ) {
      query.setParameter(
          query.getNamedParameters()[0],
          key,
          persister.getKeyType()
        );
    }
    else {
      query.setParameter( 0, key, persister.getKeyType() );
    }
    query.setCollectionKey( key )
        .setFlushMode( FlushMode.MANUAL )
        .list();

  }
}
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