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 package com.android.nfc.cardemulation.util; 17 18 import static java.nio.file.StandardCopyOption.REPLACE_EXISTING; 19 20 import android.util.Log; 21 22 import java.io.File; 23 import java.io.IOException; 24 import java.nio.file.Files; 25 26 public class NfcFileUtils { 27 private static final String TAG = "NfcFileUtils"; 28 29 /** 30 * Check if there are any files in the provided directory. 31 * @return true if there are no files, false otherwise. 32 */ isEmptyDir(File dir)33 public static boolean isEmptyDir(File dir) { 34 final File[] files = dir.listFiles(); 35 return files == null || files.length == 0; 36 } 37 38 /** 39 * Try our best to migrate all files from source to target. 40 * 41 * @return the number of files moved, or -1 if there was trouble. 42 */ moveFiles(File sourceDir, File targetDir)43 public static int moveFiles(File sourceDir, File targetDir) { 44 final File[] sourceFiles = sourceDir.listFiles(); 45 if (sourceFiles == null) return -1; 46 int res = 0; 47 for (File sourceFile : sourceFiles) { 48 final File targetFile = new File(targetDir, sourceFile.getName()); 49 Log.d(TAG, "moveFiles: Migrating " + sourceFile + " to " + targetFile); 50 try { 51 Files.move(sourceFile.toPath(), targetFile.toPath(), REPLACE_EXISTING); 52 if (res != -1) { 53 res++; 54 } 55 } catch (IOException e) { 56 Log.w(TAG, "moveFiles: Failed to migrate " + sourceFile + ": " + e); 57 res = -1; 58 } 59 } 60 return res; 61 } 62 } 63