/**
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.settings.backup;
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import android.app.backup.BackupAgentHelper;
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import android.app.backup.BackupDataInputStream;
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import android.app.backup.BackupDataOutput;
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import android.app.backup.BackupHelper;
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import android.os.ParcelFileDescriptor;
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import com.android.settings.shortcut.CreateShortcutPreferenceController;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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/**
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* Backup agent for Settings APK
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*/
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public class SettingsBackupHelper extends BackupAgentHelper {
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@Override
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public void onCreate() {
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super.onCreate();
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addHelper("no-op", new NoOpHelper());
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}
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@Override
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public void onRestoreFinished() {
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super.onRestoreFinished();
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CreateShortcutPreferenceController.updateRestoredShortcuts(this);
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}
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/**
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* Backup helper which does not do anything. Having at least one helper ensures that the
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* transport is not empty and onRestoreFinished is called eventually.
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*/
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private static class NoOpHelper implements BackupHelper {
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private final int VERSION_CODE = 1;
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@Override
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public void performBackup(ParcelFileDescriptor oldState, BackupDataOutput data,
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ParcelFileDescriptor newState) {
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try (FileOutputStream out = new FileOutputStream(newState.getFileDescriptor())) {
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if (getVersionCode(oldState) != VERSION_CODE) {
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data.writeEntityHeader("dummy", 1);
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data.writeEntityData(new byte[1], 1);
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}
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// Write new version code
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out.write(VERSION_CODE);
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out.flush();
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} catch (IOException e) { }
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}
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@Override
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public void restoreEntity(BackupDataInputStream data) { }
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@Override
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public void writeNewStateDescription(ParcelFileDescriptor newState) { }
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private int getVersionCode(ParcelFileDescriptor state) {
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if (state == null) {
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return 0;
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}
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try (FileInputStream in = new FileInputStream(state.getFileDescriptor())) {
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return in.read();
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} catch (IOException e) {
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return 0;
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}
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}
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}
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}
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