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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.content.Context;
import android.os.ParcelFileDescriptor;
import android.util.Log;
import java.io.FileDescriptor;
/** @hide */
public class FileBackupHelper {
private static final String TAG = "FileBackupHelper";
/**
* 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 static void performBackup(Context context,
ParcelFileDescriptor oldState, BackupDataOutput data,
ParcelFileDescriptor newState, String[] files) {
String basePath = context.getFilesDir().getAbsolutePath();
performBackup_checked(basePath, oldState, data, newState, files);
}
/**
* Check the parameters so the native code doens't have to throw all the exceptions
* since it's easier to do that from java.
*/
static void performBackup_checked(String basePath,
ParcelFileDescriptor oldState, BackupDataOutput data,
ParcelFileDescriptor newState, String[] files) {
if (files.length == 0) {
return;
}
if (basePath == null) {
throw new NullPointerException();
}
// oldStateFd can be null
FileDescriptor oldStateFd = oldState != null ? oldState.getFileDescriptor() : null;
if (data.fd == null) {
throw new NullPointerException();
}
FileDescriptor newStateFd = newState.getFileDescriptor();
if (newStateFd == null) {
throw new NullPointerException();
}
int err = performBackup_native(basePath, oldStateFd, data.fd, newStateFd, files);
if (err != 0) {
throw new RuntimeException("Backup failed"); // TODO: more here
}
}
native private static int performBackup_native(String basePath, FileDescriptor oldState,
FileDescriptor data, FileDescriptor newState, String[] files);
}
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