/**
* Copyright 2010 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.concurrencycontrol.common;
import org.waveprotocol.wave.model.id.WaveletId;
/**
* Factory for UnsavedDataListeners.
*
* @author jochen@google.com (Jochen Bekmann)
*/
public interface UnsavedDataListenerFactory {
UnsavedDataListener create(WaveletId waveletId);
void destroy(WaveletId waveletId);
/**
* Vacuous implementation.
*/
public static UnsavedDataListenerFactory NONE = new UnsavedDataListenerFactory() {
private final UnsavedDataListener none = new UnsavedDataListener() {
@Override
public void onClose(boolean everythingCommitted) {
}
@Override
public void onUpdate(UnsavedDataInfo unsavedDataInfo) {
}
};
@Override
public void destroy(WaveletId waveletId) {
}
@Override
public UnsavedDataListener create(WaveletId waveletId) {
return none;
}
};
}