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    1   /*
    2    * Hibernate, Relational Persistence for Idiomatic Java
    3    *
    4    * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
    5    * indicated by the @author tags or express copyright attribution
    6    * statements applied by the authors.  All third-party contributions are
    7    * distributed under license by Red Hat Middleware LLC.
    8    *
    9    * This copyrighted material is made available to anyone wishing to use, modify,
   10    * copy, or redistribute it subject to the terms and conditions of the GNU
   11    * Lesser General Public License, as published by the Free Software Foundation.
   12    *
   13    * This program is distributed in the hope that it will be useful,
   14    * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   15    * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
   16    * for more details.
   17    *
   18    * You should have received a copy of the GNU Lesser General Public License
   19    * along with this distribution; if not, write to:
   20    * Free Software Foundation, Inc.
   21    * 51 Franklin Street, Fifth Floor
   22    * Boston, MA  02110-1301  USA
   23    *
   24    */
   25   package org.hibernate.loader.collection;
   26   
   27   import java.io.Serializable;
   28   import java.util.Map;
   29   
   30   import org.hibernate.HibernateException;
   31   import org.hibernate.engine.SessionFactoryImplementor;
   32   import org.hibernate.engine.SessionImplementor;
   33   import org.hibernate.loader.OuterJoinLoader;
   34   import org.hibernate.persister.collection.QueryableCollection;
   35   import org.hibernate.type.Type;
   36   
   37   /**
   38    * Superclass for loaders that initialize collections
   39    * 
   40    * @see OneToManyLoader
   41    * @see BasicCollectionLoader
   42    * @author Gavin King
   43    */
   44   public class CollectionLoader extends OuterJoinLoader implements CollectionInitializer {
   45   
   46   	private final QueryableCollection collectionPersister;
   47   
   48   	public CollectionLoader(QueryableCollection collectionPersister, SessionFactoryImplementor factory, Map enabledFilters) {
   49   		super( factory, enabledFilters );
   50   		this.collectionPersister = collectionPersister;
   51   	}
   52   
   53   	protected boolean isSubselectLoadingEnabled() {
   54   		return hasSubselectLoadableCollections();
   55   	}
   56   
   57   	public void initialize(Serializable id, SessionImplementor session)
   58   	throws HibernateException {
   59   		loadCollection( session, id, getKeyType() );
   60   	}
   61   
   62   	protected Type getKeyType() {
   63   		return collectionPersister.getKeyType();
   64   	}
   65   
   66   	public String toString() {
   67   		return getClass().getName() + '(' + collectionPersister.getRole() + ')';
   68   	}
   69   }

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