generateForAnnotatedElement method
String
generateForAnnotatedElement(
- Element element,
- ConstantReader annotation,
- 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.
Implementations should return null
when no content is generated. Empty
or whitespace-only String instances are also ignored.
Implementation
@override
String generateForAnnotatedElement(
Element element,
ConstantReader annotation,
BuildStep buildStep,
) {
if (!element.library!.isNonNullableByDefault) {
throw InvalidGenerationSourceError(
'Generator cannot target libraries that have not been migrated to null-safety.',
element: element,
);
}
if (element is! EnumElement) {
throw InvalidGenerationSourceError(
'`@XmlEnum` can only be used on enums.',
element: element,
);
}
return 'const \$${element.name}EnumMap = { ${element.fields.where((e) => e.isEnumConstant).map((e) => '${element.name}.${e.name}: \'${e.hasXmlValue ? e.getXmlValue()!.toXmlValueValue()!.value : e.getEncodedFieldName()}\'').join(', ')} };';
}