/** * 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; } }; }