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      */
AbsoluteFileBackupHelper(Context context, String... files)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      */
performBackup(ParcelFileDescriptor oldState, BackupDataOutput data, ParcelFileDescriptor newState)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      */
restoreEntity(BackupDataInputStream data)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