?? evictvisitor.java
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//$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() ) ); } }}
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