1 /* 2 * Copyright (C) 2024 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.ondevicepersonalization.services.data.vendor; 18 19 import com.android.ondevicepersonalization.internal.util.LoggerFactory; 20 21 import java.io.File; 22 import java.util.ArrayList; 23 import java.util.HashMap; 24 import java.util.List; 25 import java.util.Map; 26 import java.util.Set; 27 28 public class FileUtils { 29 private static final LoggerFactory.Logger sLogger = LoggerFactory.getLogger(); 30 private static final String TAG = "FileUtils"; FileUtils()31 private FileUtils() {} 32 33 /** 34 * Deletes all files from the directory that no longer 35 * exist in the given keySet or are not the most recent version. 36 */ cleanUpFilesDir(Set<String> keySet, File dir)37 public static void cleanUpFilesDir(Set<String> keySet, File dir) { 38 // Delete any non-recent files with same key or non-existent key. 39 List<File> filesToDelete = new ArrayList<>(); 40 Map<String, File> filesSeen = new HashMap<>(); 41 if (dir.isDirectory()) { 42 for (File f : dir.listFiles()) { 43 try { 44 String[] fileNameList = f.getName().split("_"); 45 long timestamp = Long.parseLong(fileNameList[1]); 46 String fKey = fileNameList[0]; 47 48 // Key no longer exists in DB. Mark for deletion 49 if (!keySet.contains(fKey)) { 50 filesToDelete.add(f); 51 } 52 53 // If duplicate key, mark oldest key for deletion 54 if (filesSeen.containsKey(fKey)) { 55 File existingFile = filesSeen.get(fKey); 56 if (timestamp < Long.parseLong(existingFile.getName().split("_")[1])) { 57 filesToDelete.add(f); 58 } else { 59 filesToDelete.add(existingFile); 60 filesSeen.put(fKey, f); 61 } 62 } else { 63 filesSeen.put(fKey, f); 64 } 65 } catch (Exception e) { 66 // Delete any files that do not match expected format. 67 sLogger.w(TAG + " :Failed to parse file: " + f.getName(), e); 68 filesToDelete.add(f); 69 } 70 } 71 } 72 for (File f : filesToDelete) { 73 f.delete(); 74 } 75 } 76 77 /** 78 * Deletes a directory and all files recursively 79 */ deleteDirectory(File fileOrDirectory)80 public static void deleteDirectory(File fileOrDirectory) { 81 if (fileOrDirectory.isDirectory()) { 82 for (File child : fileOrDirectory.listFiles()) { 83 deleteDirectory(child); 84 } 85 } 86 fileOrDirectory.delete(); 87 } 88 89 } 90