Migrate filesharing_logic and files_usecases to null safety.

lib/filesharing/files_basics/lib/src/local_file/local_file.dart

@@ -19,7 +19,7 @@ abstract class LocalFile {
   dynamic getFile();
   dynamic getData();
 
-  String getPath();
+  String? getPath();
 
   String getName();
 

lib/filesharing/files_basics/lib/src/local_file/local_file_data.dart

@@ -15,8 +15,8 @@ class LocalFileData extends LocalFile {
   final Uint8List fileData;
   final String fileName;
   final int sizeBytes;
-  final MimeType mimeType;
-  final String path;
+  final MimeType? mimeType;
+  final String? path;
 
   LocalFileData._({
     required this.fileData,
@@ -27,12 +27,12 @@ class LocalFileData extends LocalFile {
   });
 
   factory LocalFileData.fromData(
-      Uint8List data, String path, String name, String type) {
+      Uint8List data, String? path, String name, String? type) {
     return LocalFileData._(
       fileData: data,
       sizeBytes: data.lengthInBytes,
       path: path,
-      mimeType: MimeType(type),
+      mimeType: type == null ? null : MimeType(type),
       fileName: name,
     );
   }
@@ -48,12 +48,12 @@ class LocalFileData extends LocalFile {
   }
 
   @override
-  String getPath() {
+  String? getPath() {
     return path;
   }
 
   @override
-  MimeType getType() {
+  MimeType? getType() {
     return mimeType;
   }
 

lib/filesharing/files_usecases/lib/src/file_compression/image_compressor.dart

@@ -9,5 +9,5 @@
 import 'package:files_basics/local_file.dart';
 
 abstract class ImageCompressor {
-  Future<LocalFile> compressImage(LocalFile file);
+  Future<LocalFile?> compressImage(LocalFile file);
 }

lib/filesharing/files_usecases/lib/src/file_compression/implementation/mobile_native_image_compressor.dart

@@ -16,7 +16,7 @@ import '../image_compressor.dart';
 
 class FlutterNativeImageCompressor extends ImageCompressor {
   @override
-  Future<LocalFile> compressImage(LocalFile file) async {
+  Future<LocalFile?> compressImage(LocalFile file) async {
     if (PlatformCheck.isMacOS) {
       // Currently, the image compressor does not work on macOS.
       //

lib/filesharing/files_usecases/lib/src/file_downloader/get_file_downloader.dart

@@ -13,6 +13,6 @@ import 'implementation/stub_file_downloader.dart'
     if (dart.library.js) 'implementation/web_file_downloader.dart'
     as implementation;
 
-FileDownloader getFileDownloader() {
+FileDownloader? getFileDownloader() {
   return implementation.getFileDownloader();
 }

lib/filesharing/files_usecases/lib/src/file_downloader/implementation/mobile_file_downloader.dart

@@ -22,38 +22,34 @@ class MobileFileDownloader extends FileDownloader {
   Future<LocalFile> downloadFileFromURL(
       String url, String filename, String id) async {
     File fileWithID = await DefaultCacheManager().getSingleFile(url);
-    if (fileWithID != null) {
-      final filePath =
-          '${path.dirname(fileWithID.path)}/$id.${FileUtils.getExtension(filename)}';
-
-      // Da unsere Dateien die ID als Namen haben, müssen diese umbenannt werden.
-      // Deswegen muss erst geprüft werden, ob der Pfad, welcher vom [DefaulCacheManger]
-      // zurückgegeben wurde, existiert. Existiert dieser Pfad, wurde die Datei gerade
-      // heruntergeladen und muss noch umbenannt werden. Die ID wird dann durch den
-      // richtigen Namen ersetzt. Wird dann beim nächsten Mal die Datei aufgerufen,
-      // befindet sich bei dem Path, welchen der [DefaultCacheManger] zurückgegeben hat,
-      // keine Datei. Das liegt daran, weil wir vorher die Datei mit dem richtigen Namen
-      // benannt haben. Wir müssen dann auch an diesem Ort suchen, also nach dem [filePath].
-      fileWithID = await fileWithID.exists()
-          ? await fileWithID.rename(filePath)
-          : File(filePath);
-
-      if (PlatformCheck.isMacOS) {
-        filename = filename.replaceAll(RegExp(r"""[();:"` <>&']"""), '');
-
-        // Falls der Dateiname vor der Extention leer ist, soll ein _ hinzufügen werden.
-        if (filename.lastIndexOf('.') == 0) {
-          filename = '_$filename';
-        }
+    final filePath =
+        '${path.dirname(fileWithID.path)}/$id.${FileUtils.getExtension(filename)}';
+
+    // Da unsere Dateien die ID als Namen haben, müssen diese umbenannt werden.
+    // Deswegen muss erst geprüft werden, ob der Pfad, welcher vom [DefaulCacheManger]
+    // zurückgegeben wurde, existiert. Existiert dieser Pfad, wurde die Datei gerade
+    // heruntergeladen und muss noch umbenannt werden. Die ID wird dann durch den
+    // richtigen Namen ersetzt. Wird dann beim nächsten Mal die Datei aufgerufen,
+    // befindet sich bei dem Path, welchen der [DefaultCacheManger] zurückgegeben hat,
+    // keine Datei. Das liegt daran, weil wir vorher die Datei mit dem richtigen Namen
+    // benannt haben. Wir müssen dann auch an diesem Ort suchen, also nach dem [filePath].
+    fileWithID = await fileWithID.exists()
+        ? await fileWithID.rename(filePath)
+        : File(filePath);
+
+    if (PlatformCheck.isMacOS) {
+      filename = filename.replaceAll(RegExp(r"""[();:"` <>&']"""), '');
+
+      // Falls der Dateiname vor der Extention leer ist, soll ein _ hinzufügen werden.
+      if (filename.lastIndexOf('.') == 0) {
+        filename = '_$filename';
       }
+    }
 
-      final fileWithNamePath = '${path.dirname(fileWithID.path)}/$filename';
-      final fileWithName = await fileWithID.copy(fileWithNamePath);
+    final fileWithNamePath = '${path.dirname(fileWithID.path)}/$filename';
+    final fileWithName = await fileWithID.copy(fileWithNamePath);
 
-      return LocalFileIo.fromFile(fileWithName);
-    } else {
-      return null;
-    }
+    return LocalFileIo.fromFile(fileWithName);
   }
 }
 

lib/filesharing/files_usecases/lib/src/file_downloader/implementation/stub_file_downloader.dart

@@ -8,6 +8,6 @@
 
 import '../file_downloader.dart';
 
-FileDownloader getFileDownloader() {
+FileDownloader? getFileDownloader() {
   return null;
 }

lib/filesharing/files_usecases/lib/src/file_picker/file_picker.dart

@@ -15,22 +15,22 @@ import 'implementation/stub_file_picker.dart'
     as implementation;
 
 class FilePicker {
-  final FilePickerImplementation _implementation;
+  final FilePickerImplementation? _implementation;
 
   FilePicker._(this._implementation);
 
   factory FilePicker() {
     return FilePicker._(implementation.getFilePickerImplementation());
   }
 
-  Future<LocalFile> pickFile() => _implementation.pickFile();
-  Future<LocalFile> pickFileImage() => _implementation.pickFileImage();
-  Future<LocalFile> pickFileVideo() => _implementation.pickFileVideo();
-  Future<List<LocalFile>> pickMultiFile() => _implementation.pickMultiFile();
-  Future<List<LocalFile>> pickMultiFileImage() =>
-      _implementation.pickMultiFileImage();
-  Future<List<LocalFile>> pickMultiFileVideo() =>
-      _implementation.pickMultiFileVideo();
-  Future<LocalFile> pickImageGallery() => _implementation.pickImageGallery();
-  Future<LocalFile> pickImageCamera() => _implementation.pickImageCamera();
+  Future<LocalFile?> pickFile() => _implementation!.pickFile();
+  Future<LocalFile?> pickFileImage() => _implementation!.pickFileImage();
+  Future<LocalFile?> pickFileVideo() => _implementation!.pickFileVideo();
+  Future<List<LocalFile>?> pickMultiFile() => _implementation!.pickMultiFile();
+  Future<List<LocalFile>?> pickMultiFileImage() =>
+      _implementation!.pickMultiFileImage();
+  Future<List<LocalFile>?> pickMultiFileVideo() =>
+      _implementation!.pickMultiFileVideo();
+  Future<LocalFile?> pickImageGallery() => _implementation!.pickImageGallery();
+  Future<LocalFile?> pickImageCamera() => _implementation!.pickImageCamera();
 }

lib/filesharing/files_usecases/lib/src/file_picker/file_picker_implementation.dart

@@ -9,12 +9,12 @@
 import 'package:files_basics/local_file.dart';
 
 abstract class FilePickerImplementation {
-  Future<LocalFile> pickFile();
-  Future<LocalFile> pickFileImage();
-  Future<LocalFile> pickFileVideo();
-  Future<List<LocalFile>> pickMultiFile();
-  Future<List<LocalFile>> pickMultiFileImage();
-  Future<List<LocalFile>> pickMultiFileVideo();
-  Future<LocalFile> pickImageGallery();
-  Future<LocalFile> pickImageCamera();
+  Future<LocalFile?> pickFile();
+  Future<LocalFile?> pickFileImage();
+  Future<LocalFile?> pickFileVideo();
+  Future<List<LocalFile>?> pickMultiFile();
+  Future<List<LocalFile>?> pickMultiFileImage();
+  Future<List<LocalFile>?> pickMultiFileVideo();
+  Future<LocalFile?> pickImageGallery();
+  Future<LocalFile?> pickImageCamera();
 }

lib/filesharing/files_usecases/lib/src/file_picker/implementation/file_picker_desktop.dart

@@ -16,17 +16,17 @@ import '../file_picker_implementation.dart';
 
 class FilePickerDesktop extends FilePickerImplementation {
   @override
-  Future<LocalFile> pickFile() async {
+  Future<LocalFile?> pickFile() async {
     return selectSingleFile();
   }
 
   @override
-  Future<LocalFile> pickFileImage() async {
+  Future<LocalFile?> pickFileImage() async {
     return selectSingleFile();
   }
 
   @override
-  Future<LocalFile> pickFileVideo() async {
+  Future<LocalFile?> pickFileVideo() async {
     return selectSingleFile();
   }
 
@@ -46,32 +46,32 @@ class FilePickerDesktop extends FilePickerImplementation {
   }
 
   @override
-  Future<LocalFile> pickImageCamera() async {
+  Future<LocalFile?> pickImageCamera() async {
     return selectSingleFile();
   }
 
   @override
-  Future<LocalFile> pickImageGallery() async {
+  Future<LocalFile?> pickImageGallery() async {
     return selectSingleFile();
   }
 }
 
 Future<List<LocalFile>> selectMultipleFiles() async {
   final fileChooserResult =
-      await file_picker.FilePicker.platform.pickFiles(allowMultiple: true);
+      (await file_picker.FilePicker.platform.pickFiles(allowMultiple: true))!;
   if (fileChooserResult.count == 0) return [];
   log('fileChooserResult.paths: ${fileChooserResult.paths}');
   final files =
-      fileChooserResult.paths.map((path) => LocalFileIo.fromFile(File(path)));
+      fileChooserResult.paths.map((path) => LocalFileIo.fromFile(File(path!)));
   return files.toList();
 }
 
-Future<LocalFile> selectSingleFile() async {
+Future<LocalFile?> selectSingleFile() async {
   final fileChooserResult =
-      await file_picker.FilePicker.platform.pickFiles(allowMultiple: false);
+      (await file_picker.FilePicker.platform.pickFiles(allowMultiple: false))!;
   if (fileChooserResult.count == 0) return null;
   final files =
-      fileChooserResult.paths.map((path) => LocalFileIo.fromFile(File(path)));
+      fileChooserResult.paths.map((path) => LocalFileIo.fromFile(File(path!)));
   return files.toList()[0];
 }
 

lib/filesharing/files_usecases/lib/src/file_picker/implementation/file_picker_html.dart

@@ -14,43 +14,44 @@ import '../file_picker_implementation.dart';
 
 class FilePickerHtml extends FilePickerImplementation {
   @override
-  Future<LocalFile> pickFile() => _pickSingle();
+  Future<LocalFile?> pickFile() => _pickSingle();
 
   @override
-  Future<LocalFile> pickFileImage() => _pickSingle();
+  Future<LocalFile?> pickFileImage() => _pickSingle();
 
   @override
-  Future<LocalFile> pickFileVideo() => _pickSingle();
+  Future<LocalFile?> pickFileVideo() => _pickSingle();
   @override
-  Future<List<LocalFile>> pickMultiFile() => _pickMulti();
+  Future<List<LocalFile>?> pickMultiFile() => _pickMulti();
 
   @override
-  Future<List<LocalFile>> pickMultiFileImage() => _pickMulti();
+  Future<List<LocalFile>?> pickMultiFileImage() => _pickMulti();
   @override
-  Future<List<LocalFile>> pickMultiFileVideo() => _pickMulti();
+  Future<List<LocalFile>?> pickMultiFileVideo() => _pickMulti();
 
   @override
-  Future<LocalFile> pickImageCamera() => _pickSingle();
+  Future<LocalFile?> pickImageCamera() => _pickSingle();
   @override
-  Future<LocalFile> pickImageGallery() => _pickSingle();
+  Future<LocalFile?> pickImageGallery() => _pickSingle();
 
-  Future<LocalFile> _pickSingle() async {
-    final res = await web.FilePicker.platform.pickFiles(allowMultiple: false);
+  Future<LocalFile?> _pickSingle() async {
+    final res =
+        (await web.FilePicker.platform.pickFiles(allowMultiple: false))!;
     if (res.files.isNotEmpty) {
       final file = res.files.single;
 
       return LocalFileData.fromData(
-          file.bytes, file.path, file.name, file.extension);
+          file.bytes!, file.path!, file.name, file.extension!);
     }
     return null;
   }
 
-  Future<List<LocalFile>> _pickMulti() async {
-    final res = await web.FilePicker.platform.pickFiles(allowMultiple: true);
+  Future<List<LocalFile>?> _pickMulti() async {
+    final res = (await web.FilePicker.platform.pickFiles(allowMultiple: true))!;
     if (res.files.isNotEmpty) {
       return res.files
           .map((file) => LocalFileData.fromData(
-              file.bytes, null, file.name, file.extension))
+              file.bytes!, null, file.name, file.extension!))
           .toList();
     }
     return null;