01: // Copyright 2006 The Apache Software Foundation
02: //
03: // Licensed under the Apache License, Version 2.0 (the "License");
04: // you may not use this file except in compliance with the License.
05: // You may obtain a copy of the License at
06: //
07: // http://www.apache.org/licenses/LICENSE-2.0
08: //
09: // Unless required by applicable law or agreed to in writing, software
10: // distributed under the License is distributed on an "AS IS" BASIS,
11: // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12: // See the License for the specific language governing permissions and
13: // limitations under the License.
14:
15: package org.apache.tapestry.services;
16:
17: /**
18: * Represents a previously stored change to a persistent field, within the context of a particular
19: * page of the application.
20: */
21: public interface PersistentFieldChange {
22: /** Returns the nested id of the component, or the empty string for the page's root component. */
23: String getComponentId();
24:
25: /** Returns the name of the field for which a change was recorded. */
26: String getFieldName();
27:
28: /** Returns the new value for the field (which may be null). */
29: Object getValue();
30: }
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