//$Id: EvictVisitor.java,v 1.4 2005/02/21 13:15:25 oneovthafew Exp $package org.hibernate.event.def;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.hibernate.HibernateException;import org.hibernate.collection.PersistentCollection;import org.hibernate.engine.CollectionEntry;import org.hibernate.engine.CollectionKey;import org.hibernate.engine.SessionImplementor;import org.hibernate.pretty.MessageHelper;import org.hibernate.type.CollectionType;/** * Evict any collections referenced by the object from the session cache. * This will NOT pick up any collections that were dereferenced, so they * will be deleted (suboptimal but not exactly incorrect). * * @author Gavin King */public class EvictVisitor extends AbstractVisitor {		private static final Log log = LogFactory.getLog(EvictVisitor.class);	EvictVisitor(SessionImplementor session) {		super(session);	}	Object processCollection(Object collection, CollectionType type)		throws HibernateException {		if (collection!=null) evictCollection(collection, type);		return null;	}	public void evictCollection(Object value, CollectionType type) {		final Object pc;		if ( type.hasHolder( getSession().getEntityMode() ) ) {			pc = getSession().getPersistenceContext().removeCollectionHolder(value);		}		else if ( value instanceof PersistentCollection ) {			pc = value;		}		else {			return; //EARLY EXIT!		}		PersistentCollection collection = (PersistentCollection) pc;		if ( collection.unsetSession( getSession() ) ) evictCollection(collection);	}	private void evictCollection(PersistentCollection collection) {		CollectionEntry ce = (CollectionEntry) getSession().getPersistenceContext().getCollectionEntries().remove(collection);		if ( log.isDebugEnabled() )			log.debug(					"evicting collection: " +					MessageHelper.collectionInfoString( ce.getLoadedPersister(), ce.getLoadedKey(), getSession().getFactory() )			);		if ( ce.getLoadedPersister() != null && ce.getLoadedKey() != null ) {			//TODO: is this 100% correct?			getSession().getPersistenceContext().getCollectionsByKey().remove( 					new CollectionKey( ce.getLoadedPersister(), ce.getLoadedKey(), getSession().getEntityMode() ) 			);		}	}}