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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 com.android.server;
import android.app.backup.BackupDataInput;
import android.app.backup.BackupDataOutput;
import android.app.backup.BackupAgentHelper;
import android.app.backup.FullBackup;
import android.app.backup.WallpaperBackupHelper;
import android.content.Context;
import android.os.ParcelFileDescriptor;
import android.os.ServiceManager;
import android.util.Slog;
import java.io.File;
import java.io.IOException;
/**
* Backup agent for various system-managed data, currently just the system wallpaper
*/
public class SystemBackupAgent extends BackupAgentHelper {
private static final String TAG = "SystemBackupAgent";
// These paths must match what the WallpaperManagerService uses
private static final String WALLPAPER_IMAGE_DIR = "/data/data/com.android.settings/files";
private static final String WALLPAPER_IMAGE = WALLPAPER_IMAGE_DIR + "/wallpaper";
private static final String WALLPAPER_INFO_DIR = "/data/system";
private static final String WALLPAPER_INFO = WALLPAPER_INFO_DIR + "/wallpaper_info.xml";
@Override
public void onBackup(ParcelFileDescriptor oldState, BackupDataOutput data,
ParcelFileDescriptor newState) throws IOException {
if (oldState == null) {
runFullBackup(data);
return;
}
// We only back up the data under the current "wallpaper" schema with metadata
WallpaperManagerService wallpaper = (WallpaperManagerService)ServiceManager.getService(
Context.WALLPAPER_SERVICE);
String[] files = new String[] { WALLPAPER_IMAGE, WALLPAPER_INFO };
if (wallpaper != null && wallpaper.mName != null && wallpaper.mName.length() > 0) {
// When the wallpaper has a name, back up the info by itself.
// TODO: Don't rely on the innards of the service object like this!
// TODO: Send a delete for any stored wallpaper image in this case?
files = new String[] { WALLPAPER_INFO };
}
addHelper("wallpaper", new WallpaperBackupHelper(SystemBackupAgent.this, files));
super.onBackup(oldState, data, newState);
}
private void runFullBackup(BackupDataOutput output) {
// Back up the data files directly
FullBackup.backupToTar(getPackageName(), null, null,
WALLPAPER_IMAGE_DIR, WALLPAPER_IMAGE, output);
FullBackup.backupToTar(getPackageName(), null, null,
WALLPAPER_INFO_DIR, WALLPAPER_INFO, output);
}
@Override
public void onRestore(BackupDataInput data, int appVersionCode, ParcelFileDescriptor newState)
throws IOException {
// On restore, we also support a previous data schema "system_files"
addHelper("wallpaper", new WallpaperBackupHelper(SystemBackupAgent.this,
new String[] { WALLPAPER_IMAGE, WALLPAPER_INFO }));
addHelper("system_files", new WallpaperBackupHelper(SystemBackupAgent.this,
new String[] { WALLPAPER_IMAGE }));
try {
super.onRestore(data, appVersionCode, newState);
WallpaperManagerService wallpaper = (WallpaperManagerService)ServiceManager.getService(
Context.WALLPAPER_SERVICE);
wallpaper.settingsRestored();
} catch (IOException ex) {
// If there was a failure, delete everything for the wallpaper, this is too aggressive,
// but this is hopefully a rare failure.
Slog.d(TAG, "restore failed", ex);
(new File(WALLPAPER_IMAGE)).delete();
(new File(WALLPAPER_INFO)).delete();
}
}
}
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