1 /*
2  * Copyright (C) 2014 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 com.android.camera.util;
18 
19 import java.io.File;
20 import java.io.FileInputStream;
21 import java.io.IOException;
22 
23 /**
24  * Common file operations.
25  */
26 public class FileUtil {
27     /**
28      * Deletes the given directory and all it's contents, including
29      * sub-directories.
30      *
31      * @param directory The directory to delete.
32      * @return Whether The deletion was a success.
33      */
deleteDirectoryRecursively(File directory)34     public static boolean deleteDirectoryRecursively(File directory) {
35         if (!directory.exists() || !directory.isDirectory()) {
36             return false;
37         }
38 
39         for (File entry : directory.listFiles()) {
40             if (entry.isDirectory()) {
41                 deleteDirectoryRecursively(entry);
42             }
43             if (!entry.delete()) {
44                 return false;
45             }
46         }
47         return directory.delete();
48     }
49 
50     /**
51      * Reads the content of a {@code File} as a byte array.
52      *
53      * @param file The file to read
54      * @return  The content of the file
55      * @throws java.io.IOException if the content of the {@code File} could not be read
56      */
readFileToByteArray(File file)57     public static byte[] readFileToByteArray(File file) throws IOException {
58         int length = (int) file.length();
59         byte[] data = new byte[length];
60         FileInputStream stream = new FileInputStream(file);
61         try {
62             int offset = 0;
63             while (offset < length) {
64                 offset += stream.read(data, offset, length - offset);
65             }
66         } catch (IOException e) {
67             throw e;
68         } finally {
69             stream.close();
70         }
71         return data;
72     }
73 
74 }
75