/*
 * 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.app.backup;

import android.content.Context;
import android.os.ParcelFileDescriptor;
import android.util.Log;

import java.io.File;

Like FileBackupHelper, but takes absolute paths for the files instead of
subpaths of getFilesDir()
@hide
/**
 * Like FileBackupHelper, but takes absolute paths for the files instead of
 * subpaths of getFilesDir()
 *
 * @hide
 */
public class AbsoluteFileBackupHelper extends FileBackupHelperBase implements BackupHelper {
    private static final String TAG = "AbsoluteFileBackupHelper";
    private static final boolean DEBUG = false;

    Context mContext;
    String[] mFiles;

    
Construct a helper for backing up / restoring the files at the given absolute locations
within the file system.
Params:
context – 
files – /**
     * Construct a helper for backing up / restoring the files at the given absolute locations
     * within the file system.
     *
     * @param context
     * @param files
     */
    public AbsoluteFileBackupHelper(Context context, String... files) {
        super(context);

        mContext = context;
        mFiles = files;
    }

    
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.
/**
     * 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 void performBackup(ParcelFileDescriptor oldState, BackupDataOutput data,
            ParcelFileDescriptor newState) {
        // use the file paths as the keys, too
        performBackup_checked(oldState, data, newState, mFiles, mFiles);
    }

    
Restore one absolute file entity from the restore stream
/**
     * Restore one absolute file entity from the restore stream
     */
    public void restoreEntity(BackupDataInputStream data) {
        if (DEBUG) Log.d(TAG, "got entity '" + data.getKey() + "' size=" + data.size());
        String key = data.getKey();
        if (isKeyInList(key, mFiles)) {
            File f = new File(key);
            writeFile(f, data);
        }
    }
}