Provides Dart Build System builders for handling Enum.

Setup

To configure your project for the latest released version of mobkit_enum_generator, see the example. If you want to get annotation with Enums, you must set the Description of EnumSerializable annotation to true

flutter pub add -d mobkit_enum_generator

Example

Given a library example.dart with an Person enum annotated with EnumSerializable:

import 'package:json_annotation/json_annotation.dart';
import 'package:mobkit_enum_generator/annotations.dart';

part 'example.g.dart';

@EnumSerializable(String, null)
enum PersonStr {
  @JsonValue('John')
  name,
  @JsonValue('66')
  number;

  static PersonStr? fromJson(dynamic json) => _$PersonStrFromJson(json);
}

@EnumSerializable(int, ["name description", "number description"])
enum PersonInt {
  @JsonValue(1)
  name,
  @JsonValue(66)
  number;

  static PersonInt? fromJson(dynamic json) => _$PersonIntFromJson(json);
}

Building creates the corresponding part example.g.dart:

part of 'example.dart';

const Map<PersonStr, String> _$PersonStrEnumMap = {
  PersonStr.name: 'John',
  PersonStr.number: '66',
};

extension PersonStrExtension on PersonStr {
  String toValue() {
    return _$PersonStrEnumMap[this]!;
  }
}

PersonStr? _$PersonStrFromValue(String id) {
  return _$PersonStrEnumMap.keys
          .any((element) => _$PersonStrEnumMap[element] == id)
      ? _$PersonStrEnumMap.keys
          .firstWhere((element) => _$PersonStrEnumMap[element] == id)
      : null;
}

PersonStr? _$PersonStrFromJson(dynamic json) {
  if (json is String) {
    return _$PersonStrFromValue(json);
  }
  return null;
}

const Map<PersonInt, int> _$PersonIntEnumMap = {
  PersonInt.name: 1,
  PersonInt.number: 66,
};

extension PersonIntExtension on PersonInt {
  int toValue() {
    return _$PersonIntEnumMap[this]!;
  }
}

PersonInt? _$PersonIntFromValue(int id) {
  return _$PersonIntEnumMap.keys
          .any((element) => _$PersonIntEnumMap[element] == id)
      ? _$PersonIntEnumMap.keys
          .firstWhere((element) => _$PersonIntEnumMap[element] == id)
      : null;
}

PersonInt? _$PersonIntFromJson(dynamic json) {
  if (json is int) {
    return _$PersonIntFromValue(json);
  }
  return null;
}

extension PersonIntDescriptionExtension on PersonInt {
  String toDescription() {
    switch (this) {
      case PersonInt.name:
        return 'name description';
      case PersonInt.number:
        return 'number description';
    }
  }
}

Running the code generator

Once you have added the annotations to your code you then need to run the code generator to generate the missing .g.dart generated dart files.

With a Dart package, run dart run build_runner build in the package directory.

With a Flutter package, run flutter pub run build_runner build in your package directory.

Annotation values

The only annotation required to use this package is EnumValues. When applied to a enum (in a correctly configured package), toValue code will be generated when you build.

Custom Annotations

Annotation can be added on Enum with JsonValue and Enum Value.

import 'package:mobkit_enum_generator/annotations.dart';

part 'example.g.dart'

@EnumSerializable(String, null)
enum Person {
  @EnumValue('John')
  name,
  @JsonValue('66')
  number;

  static Person? fromJson(dynamic json) => _$PersonFromJson(json);

}