1 /* 2 * Copyright (C) 2016 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.compatibility.common.util; 18 19 import java.io.BufferedInputStream; 20 import java.io.BufferedOutputStream; 21 import java.io.File; 22 import java.io.FileOutputStream; 23 import java.io.IOException; 24 import java.io.InputStream; 25 import java.io.OutputStream; 26 27 /** 28 * A helper class for file related operations 29 */ 30 public class FileUtil { 31 32 /** 33 * Recursively delete given file or directory and all its contents. 34 * 35 * @param rootDir the directory or file to be deleted; can be null 36 */ recursiveDelete(File rootDir)37 public static void recursiveDelete(File rootDir) { 38 if (rootDir != null) { 39 if (rootDir.isDirectory()) { 40 File[] childFiles = rootDir.listFiles(); 41 if (childFiles != null) { 42 for (File child : childFiles) { 43 recursiveDelete(child); 44 } 45 } 46 } 47 rootDir.delete(); 48 } 49 } 50 51 /** 52 * A helper method for writing stream data to file 53 * 54 * @param input the unbuffered input stream 55 * @param destFile the dest file to write to 56 */ writeToFile(InputStream input, File destFile)57 public static void writeToFile(InputStream input, File destFile) throws IOException { 58 InputStream origStream = null; 59 OutputStream destStream = null; 60 try { 61 origStream = new BufferedInputStream(input); 62 destStream = new BufferedOutputStream(new FileOutputStream(destFile)); 63 StreamUtil.copyStreams(origStream, destStream); 64 } finally { 65 origStream.close(); 66 destStream.flush(); 67 destStream.close(); 68 } 69 } 70 71 } 72