scala-annotations

scala-annotations

from https://medium.com/@giposse/scala-reflection-f5bde5fce630:

import javaAnnotations.{ SomethingIzable, VaporElement}
 
 import scala.reflect.runtime.{universe => ru}
 import ru._
 
 @SomethingIzable(value = “Teletransport”, level = 35)
 case class Annotated (
 field1 : Integer,
 
 @VaporElement(1.002)
 field2 : String
 )
 
 object GetAnnot extends App {
 
 def getAnnotationProperties(annotation: Annotation) = {
 val returnValue = annotation.tree.children
 .filter(a => a.isInstanceOf[AssignOrNamedArg])
 .map(_.asInstanceOf[AssignOrNamedArg])
 .map(ap => (ap.lhs, ap.rhs))
 
 returnValue
 }
 
 def annotationTypeName(annot: Annotation) = annot.tree.tpe.typeSymbol.name.toString()
 
 val objSymbol = typeOf[Annotated].typeSymbol;
 val classAnnot = getAnnotationProperties(objSymbol.annotations.head);
 
 val annotatedProps = objSymbol.info.decls.filter(_.annotations.nonEmpty)
 
 val mainCtor = objSymbol.info.decls.find(d => d.isMethod && d.asMethod.isPrimaryConstructor).get
 val params = mainCtor.typeSignature.paramLists.head
 val annotatedParams = params.filter(p => p.annotations.nonEmpty)
 val annotData = annotatedParams.map(ap => (ap.name.toString(), ap.annotations
 .map(sa => (annotationTypeName(sa), getAnnotationProperties(sa)))))
 
 println(“Done!”)
 }