/**
* 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.adt;
import org.waveprotocol.wave.model.wave.SourcesEvents;
/**
* Extension of a {@link BasicSet} that broadcasts events whenever the set state
* changes.
*
*/
public interface ObservableBasicSet<T> extends BasicSet<T>,
SourcesEvents<ObservableBasicSet.Listener<T>> {
public interface Listener<T> {
/**
* Notifies this listener that a value has been added to the set.
*/
void onValueAdded(T newValue);
/**
* Notifies this listener that a value has been removed from the set.
*/
void onValueRemoved(T oldValue);
}
}