private void preserveSnapshot(PersistentCollection original,
			PersistentCollection result, AssociationType elemType,
			Object owner, Map copyCache, SessionImplementor session) {
		Serializable originalSnapshot = original.getStoredSnapshot();
		Serializable resultSnapshot = result.getStoredSnapshot();
		Serializable targetSnapshot;

		if ( originalSnapshot instanceof List ) {
			targetSnapshot = new ArrayList(
					( (List) originalSnapshot ).size() );
			for ( Object obj : (List) originalSnapshot ) {
				( (List) targetSnapshot ).add( elemType.replace(
						obj, null, session, owner, copyCache ) );
			}

		}
		else if ( originalSnapshot instanceof Map ) {
			if ( originalSnapshot instanceof SortedMap ) {
				targetSnapshot = new TreeMap(
						( (SortedMap) originalSnapshot ).comparator() );
			}
			else {
				targetSnapshot = new HashMap(
						CollectionHelper.determineProperSizing(
								( (Map) originalSnapshot ).size() ),
						CollectionHelper.LOAD_FACTOR );
			}

			for ( Map.Entry<Object, Object> entry : (
					(Map<Object, Object>) originalSnapshot ).entrySet() ) {
				Object key = entry.getKey();
				Object value = entry.getValue();
				Object resultSnapshotValue = ( resultSnapshot == null ) ? null
						: ( (Map<Object, Object>) resultSnapshot ).get( key );

				if ( key == value ) {
					Object newValue = elemType.replace( value,
							resultSnapshotValue, session, owner, copyCache );
					( (Map) targetSnapshot ).put( newValue, newValue );

				}
				else {
					Object newValue = elemType.replace( value,
							resultSnapshotValue, session, owner, copyCache );
					( (Map) targetSnapshot ).put( key, newValue );
				}

			}

		}
		else if ( originalSnapshot instanceof Object[] ) {
			Object[] arr = (Object[]) originalSnapshot;
			for ( int i = 0; i < arr.length; i++ ) {
				arr[i] = elemType.replace(
						arr[i], null, session, owner, copyCache );
			}
			targetSnapshot = originalSnapshot;

		}
		else {
			// retain the same snapshot
			targetSnapshot = resultSnapshot;

		}

		CollectionEntry ce = session.getPersistenceContext().getCollectionEntry(
				result );
		if ( ce != null ) {
			ce.resetStoredSnapshot( result, targetSnapshot );
		}

	}