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/*
* Copyright (C) 2009 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.backup;
import android.os.ParcelFileDescriptor;
import java.io.InputStream;
/**
* STOPSHIP: document!
*/
public interface BackupHelper {
/**
* Based on oldState, determine which of the files from the application's data directory
* need to be backed up, write them to the data stream, and fill in newState with the
* state as it exists now.
*/
public void performBackup(ParcelFileDescriptor oldState, BackupDataOutput data,
ParcelFileDescriptor newState);
/**
* Called by BackupHelperAgent to restore one entity from the restore dataset.
* <p class=note>
* Do not close the <code>data</code> stream. Do not read more than
* <code>data.size()</code> bytes from <code>data</code>.
*/
public void restoreEntity(BackupDataInputStream data);
/**
* Called by BackupHelperAgent to write the new backup state file corresponding to
* the current state of the app's data at the time the backup operation was
* performed.
*/
public void writeNewStateDescription(ParcelFileDescriptor fd);
}
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