/**
* Copyright 2009 Google Inc.
*
* 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.waveprotocol.wave.model.util;
import java.util.Map;
/**
* A document listener that is only interested in attribute changes.
*
* @param <E> document's element type
*/
public interface AttributeListener<E> {
/**
* Notifies this listener that attributes of an element within a document have
* changed.
*
* @param element element that changed
* @param oldValues attribute values that have been deleted
* @param newValues attribute values that have been inserted
*/
void onAttributesChanged(E element, Map<String, String> oldValues, Map<String, String> newValues);
}