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Central module for Tapestry, containing interfaces to the Java
Servlet API and all core services and components.
// Copyright 2006 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package org.apache.tapestry5.services;
/**
* Represents a previously stored change to a persistent field, within the context of a particular page of the
* application.
*/
public interface PersistentFieldChange
{
/**
* Returns the nested id of the component, or the empty string for the page's root component.
*/
String getComponentId();
/**
* Returns the name of the field for which a change was recorded.
*/
String getFieldName();
/**
* Returns the new value for the field (which may be null).
*/
Object getValue();
}