content: /*
   * Copyright (C) 2007 The Android Open Source Project
   *
   * 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 android.database;
  
  /**
   * Receives call backs when a data set has been changed, or made invalid. The typically data sets
   * that are observed are {@link Cursor}s or {@link android.widget.Adapter}s.
   * DataSetObserver must be implemented by objects which are added to a DataSetObservable.
   */
  public abstract class DataSetObserver {
      /**
       * This method is called when the entire data set has changed,
       * most likely through a call to {@link Cursor#requery()} on a {@link Cursor}.
       */
      public void onChanged() {
          // Do nothing
      }
  
      /**
       * This method is called when the entire data becomes invalid,
       * most likely through a call to {@link Cursor#deactivate()} or {@link Cursor#close()} on a
       * {@link Cursor}.
       */
      public void onInvalidated() {
          // Do nothing
      }
  }
  