[dart][dart-dio] Add built_value date support w/o timemachine (#9180)

* [dart][dart-dio] Add built_value date support w/o timemachine

* Test improvements

* Fix lists of dates not working

Author: kuhnroyal

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartDioNextClientCodegen.java

@@ -205,13 +205,19 @@ private void configureDateLibrary(String srcFolder) {
                 imports.put("OffsetDate", "package:time_machine/time_machine.dart");
                 imports.put("OffsetDateTime", "package:time_machine/time_machine.dart");
                 if (SERIALIZATION_LIBRARY_BUILT_VALUE.equals(library)) {
-                    supportingFiles.add(new SupportingFile("serialization/built_value/local_date_serializer.mustache", srcFolder, "local_date_serializer.dart"));
+                    supportingFiles.add(new SupportingFile("serialization/built_value/offset_date_serializer.mustache", srcFolder, "local_date_serializer.dart"));
                 }
                 break;
             default:
             case DATE_LIBRARY_CORE:
-                // this option uses the dart core classes
                 additionalProperties.put("useDateLibCore", "true");
+                if (SERIALIZATION_LIBRARY_BUILT_VALUE.equals(library)) {
+                    typeMapping.put("date", "Date");
+                    typeMapping.put("Date", "Date");
+                    importMapping.put("Date", "package:" + pubName + "/src/model/date.dart");
+                    supportingFiles.add(new SupportingFile("serialization/built_value/date.mustache", srcFolder + File.separator + "model", "date.dart"));
+                    supportingFiles.add(new SupportingFile("serialization/built_value/date_serializer.mustache", srcFolder, "date_serializer.dart"));
+                }
                 break;
         }
     }

modules/openapi-generator/src/main/resources/dart/libraries/dio/lib.mustache

@@ -3,7 +3,8 @@ export 'package:{{pubName}}/src/api.dart';
 export 'package:{{pubName}}/src/auth/api_key_auth.dart';
 export 'package:{{pubName}}/src/auth/basic_auth.dart';
 export 'package:{{pubName}}/src/auth/oauth.dart';
-{{#useBuiltValue}}export 'package:{{pubName}}/src/serializers.dart';{{/useBuiltValue}}
+{{#useBuiltValue}}export 'package:{{pubName}}/src/serializers.dart';
+{{#useDateLibCore}}export 'package:{{pubName}}/src/model/date.dart';{{/useDateLibCore}}{{/useBuiltValue}}
 
 {{#apiInfo}}{{#apis}}export 'package:{{pubName}}/src/api/{{classFilename}}.dart';
 {{/apis}}{{/apiInfo}}

modules/openapi-generator/src/main/resources/dart/libraries/dio/serialization/built_value/date.mustache

@@ -0,0 +1,69 @@
+/// A gregorian calendar date generated by
+/// OpenAPI generator to differentiate
+/// between [DateTime] and [Date] formats.
+class Date implements Comparable<Date> {
+  final int year;
+
+  /// January is 1.
+  final int month;
+
+  /// First day is 1.
+  final int day;
+
+  Date(this.year, this.month, this.day);
+
+  /// The current date
+  static Date now({bool utc = false}) {
+    var now = DateTime.now();
+    if (utc) {
+      now = now.toUtc();
+    }
+    return now.toDate();
+  }
+
+  /// Convert to a [DateTime].
+  DateTime toDateTime({bool utc = false}) {
+    if (utc) {
+      DateTime.utc(year, month, day);
+    }
+    return DateTime(year, month, day);
+  }
+
+  @override
+  int compareTo(Date other) {
+    int d = year.compareTo(other.year);
+    if (d != 0) {
+      return d;
+    }
+    d = month.compareTo(other.month);
+    if (d != 0) {
+      return d;
+    }
+    return day.compareTo(other.day);
+  }
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      other is Date &&
+          runtimeType == other.runtimeType &&
+          year == other.year &&
+          month == other.month &&
+          day == other.day;
+
+  @override
+  int get hashCode => year.hashCode ^ month.hashCode ^ day.hashCode;
+
+  @override
+  String toString() {
+    final yyyy = year.toString();
+    final mm = month.toString().padLeft(2, '0');
+    final dd = day.toString().padLeft(2, '0');
+
+    return '$yyyy-$mm-$dd';
+  }
+}
+
+extension DateTimeToDate on DateTime {
+  Date toDate() => Date(year, month, day);
+}

modules/openapi-generator/src/main/resources/dart/libraries/dio/serialization/built_value/date_serializer.mustache

@@ -0,0 +1,28 @@
+{{>header}}
+import 'package:built_collection/built_collection.dart';
+import 'package:built_value/serializer.dart';
+import 'package:{{pubName}}/src/model/date.dart';
+
+class DateSerializer implements PrimitiveSerializer<Date> {
+
+  const DateSerializer();
+
+  @override
+  Iterable<Type> get types => BuiltList.of([Date]);
+
+  @override
+  String get wireName => 'Date';
+
+  @override
+  Date deserialize(Serializers serializers, Object serialized,
+      {FullType specifiedType = FullType.unspecified}) {
+    final parsed = DateTime.parse(serialized as String);
+    return Date(parsed.year, parsed.month, parsed.day);
+  }
+
+  @override
+  Object serialize(Serializers serializers, Date date,
+      {FullType specifiedType = FullType.unspecified}) {
+    return date.toString();
+  }
+}

modules/openapi-generator/src/main/resources/dart/libraries/dio/serialization/built_value/local_date_serializer.mustache renamed to modules/openapi-generator/src/main/resources/dart/libraries/dio/serialization/built_value/offset_date_serializer.mustache

@@ -8,7 +8,7 @@ class OffsetDateSerializer implements PrimitiveSerializer<OffsetDate> {
   const OffsetDateSerializer();
 
   @override
-  Iterable<Type> get types => BuiltList<Type>([OffsetDate]);
+  Iterable<Type> get types => BuiltList.of([OffsetDate]);
 
   @override
   String get wireName => 'OffsetDate';

modules/openapi-generator/src/main/resources/dart/libraries/dio/serialization/built_value/serializers.mustache

@@ -1,11 +1,15 @@
 {{>header}}
+// ignore_for_file: unused_import
+
 import 'package:built_collection/built_collection.dart';
 import 'package:built_value/json_object.dart';
 import 'package:built_value/serializer.dart';
 import 'package:built_value/standard_json_plugin.dart';
-{{#useDateLibCore}}import 'package:built_value/iso_8601_date_time_serializer.dart';{{/useDateLibCore}}
+{{#useDateLibCore}}import 'package:built_value/iso_8601_date_time_serializer.dart';
+import 'package:{{pubName}}/src/date_serializer.dart';
+import 'package:{{pubName}}/src/model/date.dart';{{/useDateLibCore}}
 {{#useDateLibTimeMachine}}import 'package:time_machine/time_machine.dart';
-import 'package:{{pubName}}/src/local_date_serializer.dart';{{/useDateLibTimeMachine}}
+import 'package:{{pubName}}/src/offset_date_serializer.dart';{{/useDateLibTimeMachine}}
 {{#models}}{{#model}}import 'package:{{pubName}}/src/model/{{classFilename}}.dart';
 {{/model}}{{/models}}
 part 'serializers.g.dart';
@@ -25,8 +29,9 @@ Serializers serializers = (_$serializers.toBuilder(){{#apiInfo}}{{#apis}}{{#seri
 {{/isMap}}
       ){{/serializers}}{{/apis}}{{/apiInfo}}{{#useDateLibTimeMachine}}
       ..add(const OffsetDateSerializer())
-      ..add(const OffsetDateTimeSerializer()){{/useDateLibTimeMachine}}
-      ..add(Iso8601DateTimeSerializer()))
+      ..add(const OffsetDateTimeSerializer()){{/useDateLibTimeMachine}}{{#useDateLibCore}}
+      ..add(const DateSerializer())
+      ..add(Iso8601DateTimeSerializer())){{/useDateLibCore}}
     .build();
 
 Serializers standardSerializers =

samples/openapi3/client/petstore/dart-dio-next/petstore_client_lib_fake/.openapi-generator/FILES

@@ -66,6 +66,7 @@ lib/src/auth/api_key_auth.dart
 lib/src/auth/auth.dart
 lib/src/auth/basic_auth.dart
 lib/src/auth/oauth.dart
+lib/src/date_serializer.dart
 lib/src/model/additional_properties_class.dart
 lib/src/model/animal.dart
 lib/src/model/api_response.dart
@@ -77,6 +78,7 @@ lib/src/model/cat.dart
 lib/src/model/cat_all_of.dart
 lib/src/model/category.dart
 lib/src/model/class_model.dart
+lib/src/model/date.dart
 lib/src/model/dog.dart
 lib/src/model/dog_all_of.dart
 lib/src/model/enum_arrays.dart

samples/openapi3/client/petstore/dart-dio-next/petstore_client_lib_fake/doc/FakeApi.md

@@ -478,7 +478,7 @@ var int64 = 789; // int | None
 var float = 3.4; // double | None
 var string = string_example; // String | None
 var binary = BINARY_DATA_HERE; // Uint8List | None
-var date = 2013-10-20; // DateTime | None
+var date = 2013-10-20; // Date | None
 var dateTime = 2013-10-20T19:20:30+01:00; // DateTime | None
 var password = password_example; // String | None
 var callback = callback_example; // String | None
@@ -504,7 +504,7 @@ Name | Type | Description  | Notes
  **float** | **double**| None | [optional] 
  **string** | **String**| None | [optional] 
  **binary** | **Uint8List**| None | [optional] 
- **date** | **DateTime**| None | [optional] 
+ **date** | **Date**| None | [optional] 
  **dateTime** | **DateTime**| None | [optional] 
  **password** | **String**| None | [optional] 
  **callback** | **String**| None | [optional] 

samples/openapi3/client/petstore/dart-dio-next/petstore_client_lib_fake/doc/FormatTest.md

@@ -18,7 +18,7 @@ Name | Type | Description | Notes
 **string** | **String** |  | [optional] 
 **byte** | **String** |  | 
 **binary** | [**Uint8List**](Uint8List.md) |  | [optional] 
-**date** | [**DateTime**](DateTime.md) |  | 
+**date** | [**Date**](Date.md) |  | 
 **dateTime** | [**DateTime**](DateTime.md) |  | [optional] 
 **uuid** | **String** |  | [optional] 
 **password** | **String** |  | 

samples/openapi3/client/petstore/dart-dio-next/petstore_client_lib_fake/doc/NullableClass.md

@@ -12,7 +12,7 @@ Name | Type | Description | Notes
 **numberProp** | **num** |  | [optional] 
 **booleanProp** | **bool** |  | [optional] 
 **stringProp** | **String** |  | [optional] 
-**dateProp** | [**DateTime**](DateTime.md) |  | [optional] 
+**dateProp** | [**Date**](Date.md) |  | [optional] 
 **datetimeProp** | [**DateTime**](DateTime.md) |  | [optional] 
 **arrayNullableProp** | [**BuiltList<JsonObject>**](JsonObject.md) |  | [optional] 
 **arrayAndItemsNullableProp** | [**BuiltList<JsonObject>**](JsonObject.md) |  | [optional] 

samples/openapi3/client/petstore/dart-dio-next/petstore_client_lib_fake/lib/openapi.dart

@@ -7,6 +7,7 @@ export 'package:openapi/src/auth/api_key_auth.dart';
 export 'package:openapi/src/auth/basic_auth.dart';
 export 'package:openapi/src/auth/oauth.dart';
 export 'package:openapi/src/serializers.dart';
+export 'package:openapi/src/model/date.dart';
 
 export 'package:openapi/src/api/another_fake_api.dart';
 export 'package:openapi/src/api/default_api.dart';

samples/openapi3/client/petstore/dart-dio-next/petstore_client_lib_fake/lib/src/api/fake_api.dart

@@ -10,6 +10,7 @@ import 'package:dio/dio.dart';
 import 'dart:typed_data';
 import 'package:built_collection/built_collection.dart';
 import 'package:openapi/src/api_util.dart';
+import 'package:openapi/src/model/date.dart';
 import 'package:openapi/src/model/file_schema_test_class.dart';
 import 'package:openapi/src/model/health_check_result.dart';
 import 'package:openapi/src/model/model_client.dart';
@@ -826,7 +827,7 @@ class FakeApi {
     double? float,
     String? string,
     Uint8List? binary,
-    DateTime? date,
+    Date? date,
     DateTime? dateTime,
     String? password,
     String? callback,
@@ -875,7 +876,7 @@ class FakeApi {
         r'pattern_without_delimiter': encodeFormParameter(_serializers, patternWithoutDelimiter, const FullType(String)),
         r'byte': encodeFormParameter(_serializers, byte, const FullType(String)),
         if (binary != null) r'binary': MultipartFile.fromBytes(binary, filename: r'binary'),
-        if (date != null) r'date': encodeFormParameter(_serializers, date, const FullType(DateTime)),
+        if (date != null) r'date': encodeFormParameter(_serializers, date, const FullType(Date)),
         if (dateTime != null) r'dateTime': encodeFormParameter(_serializers, dateTime, const FullType(DateTime)),
         if (password != null) r'password': encodeFormParameter(_serializers, password, const FullType(String)),
         if (callback != null) r'callback': encodeFormParameter(_serializers, callback, const FullType(String)),

samples/openapi3/client/petstore/dart-dio-next/petstore_client_lib_fake/lib/src/date_serializer.dart

@@ -0,0 +1,31 @@
+//
+// AUTO-GENERATED FILE, DO NOT MODIFY!
+//
+
+import 'package:built_collection/built_collection.dart';
+import 'package:built_value/serializer.dart';
+import 'package:openapi/src/model/date.dart';
+
+class DateSerializer implements PrimitiveSerializer<Date> {
+
+  const DateSerializer();
+
+  @override
+  Iterable<Type> get types => BuiltList.of([Date]);
+
+  @override
+  String get wireName => 'Date';
+
+  @override
+  Date deserialize(Serializers serializers, Object serialized,
+      {FullType specifiedType = FullType.unspecified}) {
+    final parsed = DateTime.parse(serialized as String);
+    return Date(parsed.year, parsed.month, parsed.day);
+  }
+
+  @override
+  Object serialize(Serializers serializers, Date date,
+      {FullType specifiedType = FullType.unspecified}) {
+    return date.toString();
+  }
+}

samples/openapi3/client/petstore/dart-dio-next/petstore_client_lib_fake/lib/src/model/date.dart

@@ -0,0 +1,69 @@
+/// A gregorian calendar date generated by
+/// OpenAPI generator to differentiate
+/// between [DateTime] and [Date] formats.
+class Date implements Comparable<Date> {
+  final int year;
+
+  /// January is 1.
+  final int month;
+
+  /// First day is 1.
+  final int day;
+
+  Date(this.year, this.month, this.day);
+
+  /// The current date
+  static Date now({bool utc = false}) {
+    var now = DateTime.now();
+    if (utc) {
+      now = now.toUtc();
+    }
+    return now.toDate();
+  }
+
+  /// Convert to a [DateTime].
+  DateTime toDateTime({bool utc = false}) {
+    if (utc) {
+      DateTime.utc(year, month, day);
+    }
+    return DateTime(year, month, day);
+  }
+
+  @override
+  int compareTo(Date other) {
+    int d = year.compareTo(other.year);
+    if (d != 0) {
+      return d;
+    }
+    d = month.compareTo(other.month);
+    if (d != 0) {
+      return d;
+    }
+    return day.compareTo(other.day);
+  }
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      other is Date &&
+          runtimeType == other.runtimeType &&
+          year == other.year &&
+          month == other.month &&
+          day == other.day;
+
+  @override
+  int get hashCode => year.hashCode ^ month.hashCode ^ day.hashCode;
+
+  @override
+  String toString() {
+    final yyyy = year.toString();
+    final mm = month.toString().padLeft(2, '0');
+    final dd = day.toString().padLeft(2, '0');
+
+    return '$yyyy-$mm-$dd';
+  }
+}
+
+extension DateTimeToDate on DateTime {
+  Date toDate() => Date(year, month, day);
+}

samples/openapi3/client/petstore/dart-dio-next/petstore_client_lib_fake/lib/src/model/format_test.dart

@@ -3,6 +3,7 @@
 //
 
 import 'dart:typed_data';
+import 'package:openapi/src/model/date.dart';
 import 'package:built_value/built_value.dart';
 import 'package:built_value/serializer.dart';
 
@@ -42,7 +43,7 @@ abstract class FormatTest implements Built<FormatTest, FormatTestBuilder> {
     Uint8List? get binary;
 
     @BuiltValueField(wireName: r'date')
-    DateTime get date;
+    Date get date;
 
     @BuiltValueField(wireName: r'dateTime')
     DateTime? get dateTime;
@@ -141,7 +142,7 @@ class _$FormatTestSerializer implements StructuredSerializer<FormatTest> {
         result
             ..add(r'date')
             ..add(serializers.serialize(object.date,
-                specifiedType: const FullType(DateTime)));
+                specifiedType: const FullType(Date)));
         if (object.dateTime != null) {
             result
                 ..add(r'dateTime')
@@ -226,7 +227,7 @@ class _$FormatTestSerializer implements StructuredSerializer<FormatTest> {
                     break;
                 case r'date':
                     result.date = serializers.deserialize(value,
-                        specifiedType: const FullType(DateTime)) as DateTime;
+                        specifiedType: const FullType(Date)) as Date;
                     break;
                 case r'dateTime':
                     result.dateTime = serializers.deserialize(value,