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      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      */
     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      */
     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