generateForAnnotatedElement method

  1. @override
FutureOr<String> generateForAnnotatedElement(
  1. Element2 element,
  2. ConstantReader annotation,
  3. BuildStep buildStep
)

Implement to return source code to generate for element.

This method is invoked based on finding elements annotated with an instance of T. The annotation is provided as a ConstantReader.

Supported return values include a single String or multiple String instances within an Iterable or Stream. It is also valid to return a Future of String, Iterable, or Stream. When multiple values are returned through an iterable or stream they will be deduplicated. Typically each value will be an independent unit of code and the deduplication prevents re-defining the same member multiple times. For example if multiple annotated elements may need a specific utility method available it can be output for each one, and the single deduplicated definition can be shared.

Implementations should return null when no content is generated. Empty or whitespace-only String instances are also ignored.

Implementation

@override
FutureOr<String> generateForAnnotatedElement(
  Element2 element,
  ConstantReader annotation,
  BuildStep buildStep,
) async {
  final className = '${ClassUtility.getClassName(element)}Gen';
  final classBuffer = StringBuffer();

  // class Apis {
  //   static PostsApi? _posts;
  //   static PostsApi get posts => _posts ??= PostsApi();
  //   @visibleForTesting
  //   static set posts(value) => _posts = value;
  // }

  // ignore: cascade_invocations
  classBuffer.writeln('mixin $className {');

  final apisJsons = Glob('lib/**.api.json');

  final jsonData = <Map>[];

  await for (final id in buildStep.findAssets(apisJsons)) {
    final json = jsonDecode(await buildStep.readAsString(id));
    jsonData.addAll([...json]);
  }

  final apis = <ApiJsonModel>[];

  for (final json in jsonData) {
    apis.add(ApiJsonModel.fromJson(json));
  }

  // ignore: prefer_foreach
  for (final element in apis) {
    final elementName = element.name;
    final elementShortName = elementName.toLowerCase().split('api')[0];

    classBuffer
      ..writeln('$elementName? _$elementShortName;')
      ..writeln(
          '$elementName get $elementShortName => _$elementShortName ??= $elementName();')
      ..writeln('@visibleForTesting')
      ..writeln(
          'set $elementShortName(value) => _$elementShortName = value;');
  }

  classBuffer.writeln('}');

  String printMessage = '';

  printMessage += 'umvvm_generator:\nGenerated Apis for app: ';
  printMessage += 'Apis count: ${apis.length}';

  log.info(printMessage);

  return classBuffer.toString();
}