new version sdk

lib/src/utils.dart

@@ -0,0 +1,27 @@
+import 'dart:convert';
+
+class Utils {
+  static List<T> toList<T>(String? value, T f(Map<String, dynamic> map)) {
+    var list = _formatJson(value);
+    if (null == list) return <T>[];
+    return (list as List).map((e) => f(e)).toList();
+  }
+
+  static T toObj<T>(String value, T f(Map<String, dynamic> map)) =>
+      f(_formatJson(value));
+
+  static List<dynamic> toListMap(String? value) => _formatJson(value) ?? [];
+
+  static dynamic _formatJson(String? value) {
+    if (null == value) return null;
+    return jsonDecode(_printValue(value));
+  }
+
+  static String _printValue(value) {
+    return value;
+  }
+
+  static String checkOperationID(String? obj) {
+    return obj ?? DateTime.now().millisecondsSinceEpoch.toString();
+  }
+}