ObservableManifest.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.conversation;

import org.waveprotocol.wave.model.wave.SourcesEvents;

/**
 * Extends {@link Manifest} to provide events that can be listened to.
 *
 * @author anorth@google.com (Alex North)
 */
interface ObservableManifest extends Manifest, SourcesEvents<ObservableManifest.Listener> {
  /**
   * Receives events on a {@link Manifest}.
   */
  interface Listener {
    /**
     * Notifies this listener that the manifest anchor has changed.
     *
     * @param oldAnchor the old anchor values
     * @param newAnchor the new anchor values
     */
    void onAnchorChanged(AnchorData oldAnchor, AnchorData newAnchor);
  }

  // Covariant specialisations.

  @Override
  ObservableManifestThread getRootThread();
}