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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.app.backup;
     18 
     19 import android.content.Context;
     20 import android.os.ParcelFileDescriptor;
     21 import android.util.Log;
     22 
     23 import java.io.File;
     24 
     25 /**
     26  * Like FileBackupHelper, but takes absolute paths for the files instead of
     27  * subpaths of getFilesDir()
     28  *
     29  * @hide
     30  */
     31 public class AbsoluteFileBackupHelper extends FileBackupHelperBase implements BackupHelper {
     32     private static final String TAG = "AbsoluteFileBackupHelper";
     33     private static final boolean DEBUG = false;
     34 
     35     Context mContext;
     36     String[] mFiles;
     37 
     38     /**
     39      * Construct a helper for backing up / restoring the files at the given absolute locations
     40      * within the file system.
     41      *
     42      * @param context
     43      * @param files
     44      */
     45     public AbsoluteFileBackupHelper(Context context, String... files) {
     46         super(context);
     47 
     48         mContext = context;
     49         mFiles = files;
     50     }
     51 
     52     /**
     53      * Based on oldState, determine which of the files from the application's data directory
     54      * need to be backed up, write them to the data stream, and fill in newState with the
     55      * state as it exists now.
     56      */
     57     public void performBackup(ParcelFileDescriptor oldState, BackupDataOutput data,
     58             ParcelFileDescriptor newState) {
     59         // use the file paths as the keys, too
     60         performBackup_checked(oldState, data, newState, mFiles, mFiles);
     61     }
     62 
     63     /**
     64      * Restore one absolute file entity from the restore stream
     65      */
     66     public void restoreEntity(BackupDataInputStream data) {
     67         if (DEBUG) Log.d(TAG, "got entity '" + data.getKey() + "' size=" + data.size());
     68         String key = data.getKey();
     69         if (isKeyInList(key, mFiles)) {
     70             File f = new File(key);
     71             writeFile(f, data);
     72         }
     73     }
     74 }
     75 
     76