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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.File;
import java.io.FileDescriptor;
/**
* STOPSHIP: document!
*/
public class SharedPreferencesBackupHelper extends FileBackupHelperBase implements BackupHelper {
private static final String TAG = "SharedPreferencesBackupHelper";
private static final boolean DEBUG = false;
private Context mContext;
private String[] mPrefGroups;
/**
* Construct a helper for backing up and restoring the
* {@link android.content.SharedPreferences} under the given names.
*
* @param context
* @param prefGroups
*/
public SharedPreferencesBackupHelper(Context context, String... prefGroups) {
super(context);
mContext = context;
mPrefGroups = prefGroups;
}
/**
* Backs up the configured SharedPreferences groups
*/
public void performBackup(ParcelFileDescriptor oldState, BackupDataOutput data,
ParcelFileDescriptor newState) {
Context context = mContext;
// make filenames for the prefGroups
String[] prefGroups = mPrefGroups;
final int N = prefGroups.length;
String[] files = new String[N];
for (int i=0; i<N; i++) {
files[i] = context.getSharedPrefsFile(prefGroups[i]).getAbsolutePath();
}
// go
performBackup_checked(oldState, data, newState, files, prefGroups);
}
/**
* Restores one entity from the restore data stream to its proper shared
* preferences file store.
*/
public void restoreEntity(BackupDataInputStream data) {
Context context = mContext;
String key = data.getKey();
if (DEBUG) Log.d(TAG, "got entity '" + key + "' size=" + data.size());
if (isKeyInList(key, mPrefGroups)) {
File f = context.getSharedPrefsFile(key).getAbsoluteFile();
writeFile(f, data);
}
}
}
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