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org/hibernate/loader/collection/OneToManyLoader.java
//$Id: OneToManyLoader.java 7123 2005-06-13 20:10:20Z oneovthafew $
package org.hibernate.loader.collection;

import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.MappingException;
import org.hibernate.engine.SessionFactoryImplementor;
import org.hibernate.loader.JoinWalker;
import org.hibernate.persister.collection.QueryableCollection;

/**
 * Loads one-to-many associations<br>
 <br>
 * The collection persister must implement <tt>QueryableCOllection<tt>. For
 * other collections, create a customized subclass of <tt>Loader</tt>.
 *
 @see BasicCollectionLoader
 @author Gavin King
 */
public class OneToManyLoader extends CollectionLoader {

  private static final Log log = LogFactory.getLog(OneToManyLoader.class);

  public OneToManyLoader(
      QueryableCollection oneToManyPersister, 
      SessionFactoryImplementor session, 
      Map enabledFilters)
  throws MappingException {
    this(oneToManyPersister, 1, session, enabledFilters);
  }

  public OneToManyLoader(
      QueryableCollection oneToManyPersister, 
      int batchSize, 
      SessionFactoryImplementor factory, 
      Map enabledFilters)
  throws MappingException {
    this(oneToManyPersister, batchSize, null, factory, enabledFilters);
  }

  public OneToManyLoader(
      QueryableCollection oneToManyPersister, 
      int batchSize, 
      String subquery, 
      SessionFactoryImplementor factory, 
      Map enabledFilters)
  throws MappingException {

    super(oneToManyPersister, factory, enabledFilters);
    
    JoinWalker walker = new OneToManyJoinWalker(
        oneToManyPersister, 
        batchSize, 
        subquery, 
        factory, 
        enabledFilters
      );
    initFromWalkerwalker );

    postInstantiate();

    log.debug"Static select for one-to-many " + oneToManyPersister.getRole() ": " + getSQLString() );
  }

}