public CollectionUpdateAction(PersistentCollection collection,
    CollectionPersister persister,
    Serializable id,
    boolean emptySnapshot,
    SessionImplementor session) throws CacheException 
{
		super( persister, collection, id, session );
		this.emptySnapshot = emptySnapshot;
}

 public  void execute() throws HibernateException 
{
		final Serializable id = getKey();
		final SessionImplementor session = getSession();
		final CollectionPersister persister = getPersister();
		final PersistentCollection collection = getCollection();
		boolean affectedByFilters = persister.isAffectedByEnabledFilters(session);
		preUpdate();
		if ( !collection.wasInitialized() ) {
			if ( !collection.hasQueuedOperations() ) throw new AssertionFailure( "no queued adds" );
			//do nothing - we only need to notify the cache...
		}
		else if ( !affectedByFilters && collection.empty() ) {
			if ( !emptySnapshot ) persister.remove( id, session );
		}
		else if ( collection.needsRecreate(persister) ) {
			if (affectedByFilters) {
				throw new HibernateException(
					"cannot recreate collection while filter is enabled: " + 
					MessageHelper.collectionInfoString( persister, id, persister.getFactory() )
				);
			}
			if ( !emptySnapshot ) persister.remove( id, session );
			persister.recreate( collection, id, session );
		}
		else {
			persister.deleteRows( collection, id, session );
			persister.updateRows( collection, id, session );
			persister.insertRows( collection, id, session );
		}
		getSession().getPersistenceContext()
			.getCollectionEntry(collection)
			.afterAction(collection);
		evict();
		postUpdate();
		if ( getSession().getFactory().getStatistics().isStatisticsEnabled() ) {
			getSession().getFactory().getStatisticsImplementor().
					updateCollection( getPersister().getRole() );
		}
}