Fixed annotation reader field

Author: bartektartanus

openapi-generator/lib/src/openapi_generator_runner.dart

@@ -262,7 +262,7 @@ class OpenapiGenerator extends GeneratorForAnnotation<annots.Openapi> {
   }
 
   Command _getCommandWithWrapper(String command, List<String> arguments, ConstantReader annotation){
-    final wrapper = _readFieldValueAsEnum<annots.Wrapper>(annotation, 'wrapper', annots.Wrapper.none);
+    final wrapper = annotation.read('additionalProperties')?.read('wrapper')?.enumValue<annots.Wrapper>() ?? annots.Wrapper.none;
     switch(wrapper){
       case annots.Wrapper.flutterw:
         return Command('./flutterw', arguments);
@@ -274,13 +274,6 @@ class OpenapiGenerator extends GeneratorForAnnotation<annots.Openapi> {
     }
   }
 
-  T _readFieldValueAsEnum<T>(ConstantReader annotation, String fieldName,
-      [T defaultValue]) {
-    var reader = annotation.read(fieldName);
-
-    return reader.isNull ? defaultValue : reader.enumValue<T>() ?? defaultValue;
-  }
-
   String _readFieldValueAsString(ConstantReader annotation, String fieldName,
       [String defaultValue]) {
     var reader = annotation.read(fieldName);