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/*
* 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;
}
}
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