initial commit

lib/storage/storage_service.dart

@@ -0,0 +1,54 @@
+import 'package:shared_preferences/shared_preferences.dart';
+
+enum StorageServiceValueType {
+  string,
+  stringList,
+  boolean,
+}
+
+class StorageService {
+
+  StorageService._();
+
+  static late SharedPreferences _preferences;
+
+  static Future<void> init() async {
+    _preferences = await SharedPreferences.getInstance();
+  }
+
+  static T? getValue<T>( StorageServiceValueType valueType, String key ){
+
+    Map<StorageServiceValueType, Function( String key ) > data = {
+      StorageServiceValueType.string: _preferences.getString,
+      StorageServiceValueType.stringList: _preferences.getStringList,
+      StorageServiceValueType.boolean: _preferences.getBool,
+    };
+
+    final Function( String key )? function = data[valueType];
+
+    if( function == null ) throw Exception('Unimplemented value type');
+
+    return function(key) as T?;
+
+  }
+
+  static Future<bool> setValue( StorageServiceValueType valueType, String key, dynamic value ) async {
+
+    switch( valueType ) {
+      case .string:
+        return _preferences.setString(key, value);
+      case.stringList:
+        return _preferences.setStringList(key, value);
+      case .boolean:
+        return _preferences.setBool(key, value);
+    }
+
+    throw Exception('Unimplemented value type');
+
+  }
+
+  static Future<bool> removeValue( String key ) async {
+    return await _preferences.remove(key);
+  }
+
+}