tests/backup/app/src/android/backup/app/KeyValueBackupAgent.java

/*
 * Copyright (C) 2016 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.app;

import android.app.backup.BackupAgent;
import android.app.backup.BackupDataInput;
import android.app.backup.BackupDataOutput;
import android.app.backup.FullBackupDataOutput;
import android.os.ParcelFileDescriptor;
import android.util.Log;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

/*
 * Key Value Backup agent for Backup CTS App.
 *
 * Logs callbacks into logcat.
 */
public class KeyValueBackupAgent extends BackupAgent {

    @Override
    public void onCreate() {
        Log.d(MainActivity.TAG, "onCreate");
    }

    @Override
    public void onBackup(ParcelFileDescriptor oldState, BackupDataOutput data,
                         ParcelFileDescriptor newState) throws IOException {
        Log.d(MainActivity.TAG, "Backup requested, quota is " + data.getQuota());

        // Always backup the entire file
        File testFile = new File(getFilesDir(), MainActivity.FILE_NAME);
        Log.d(MainActivity.TAG, "Writing " + testFile.length());

        data.writeEntityHeader(MainActivity.FILE_NAME, (int) testFile.length());
        byte[] buffer = new byte[4096];
        try (FileInputStream input = new FileInputStream(testFile)) {
            int read;
            while ((read = input.read(buffer)) >= 0) {
                data.writeEntityData(buffer, read);
            }
        }
    }

    @Override
    public void onRestore(BackupDataInput data, int appVersionCode,
                          ParcelFileDescriptor newState) throws IOException {
        Log.d(MainActivity.TAG, "Restore requested");
    }

    @Override
    public void onRestoreFile(ParcelFileDescriptor data, long size,
            File destination, int type, long mode, long mtime) throws IOException {
        throw new IllegalStateException("unexpected onRestoreFile");
    }

    @Override
    public void onFullBackup(FullBackupDataOutput data) throws IOException {
        throw new IllegalStateException("unexpected onFullBackup");
    }

    @Override
    public void onQuotaExceeded(long backupDataBytes, long quotaBytes) {
        Log.d(MainActivity.TAG, "Quota exceeded!");
    }

    @Override
    public void onRestoreFinished() {
        Log.d(MainActivity.TAG, "onRestoreFinished");
    }

    @Override
    public void onDestroy() {
        Log.d(MainActivity.TAG, "onDestroy");
    }

}