01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17: package org.apache.cocoon.portal.util;
18:
19: /**
20: * Interface for functionality of objects to be updated by a delta object.
21: *
22: * @author <a href="mailto:bluetkemeier@s-und-n.de">Björn Lütkemeier</a>
23: *
24: * @version CVS $Id: DeltaApplicable.java 433543 2006-08-22 06:22:54Z crossley $
25: */
26: public interface DeltaApplicable {
27:
28: /**
29: * Applies the specified delta.
30: * @return true if the delta could be successfully applied, false otherwise.
31: * false can be used if object references stored in maps must be replaced
32: * by the caller instead of a delta being applied.
33: * @throws ClassCastException If the object is not of the expected type.
34: */
35: boolean applyDelta(Object object);
36:
37: /**
38: * Checks if a delta has been applied.
39: */
40: boolean deltaApplied();
41: }
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