content: /*
   * Copyright (C) 2011 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;
  
  import android.database.CrossProcessCursor;
  import android.database.Cursor;
  import android.database.CursorWindow;
  import android.database.CursorWrapper;
  
  /**
   * Cursor wrapper that implements {@link CrossProcessCursor}.
   * <p>
   * If the wrapped cursor implements {@link CrossProcessCursor}, then the wrapper
   * delegates {@link #fillWindow}, {@link #getWindow()} and {@link #onMove} to it.
   * Otherwise, the wrapper provides default implementations of these methods that
   * traverse the contents of the cursor similar to {@link AbstractCursor#fillWindow}.
   * </p><p>
   * This wrapper can be used to adapt an ordinary {@link Cursor} into a
   * {@link CrossProcessCursor}.
   * </p>
   */
  public class CrossProcessCursorWrapper extends CursorWrapper implements CrossProcessCursor {
      /**
       * Creates a cross process cursor wrapper.
       * @param cursor The underlying cursor to wrap.
       */
      public CrossProcessCursorWrapper(Cursor cursor) {
          super(cursor);
      }
  
      @Override
      public void fillWindow(int position, CursorWindow window) {
          if (mCursor instanceof CrossProcessCursor) {
              final CrossProcessCursor crossProcessCursor = (CrossProcessCursor)mCursor;
              crossProcessCursor.fillWindow(position, window);
              return;
          }
  
          DatabaseUtils.cursorFillWindow(mCursor, position, window);
      }
  
      @Override
      public CursorWindow getWindow() {
          if (mCursor instanceof CrossProcessCursor) {
              final CrossProcessCursor crossProcessCursor = (CrossProcessCursor)mCursor;
              return crossProcessCursor.getWindow();
          }
  
          return null;
      }
  
      @Override
      public boolean onMove(int oldPosition, int newPosition) {
          if (mCursor instanceof CrossProcessCursor) {
              final CrossProcessCursor crossProcessCursor = (CrossProcessCursor)mCursor;
              return crossProcessCursor.onMove(oldPosition, newPosition);
          }
  
          return true;
      }
  }
  