How to define and use custom annotations in Scala

Question

I am trying use a custom annotation in Scala. In this example, I create a string that I want to annotate with metadata (in this case, another string). Then, given an instance of

Answer 1

With scala 2.11.6, this works to extract values of a annotation:

case class Named(name: String) extends scala.annotation.StaticAnnotation

val myAnnotatedClass: ClassSymbol = u.runtimeMirror(Thread.currentThread().getContextClassLoader).staticClass("MyAnnotatedClass")
val annotation: Option[Annotation] = myAnnotatedClass.annotations.find(_.tree.tpe =:= u.typeOf[Named])
val result = annotation.flatMap { a =>
  a.tree.children.tail.collect({ case Literal(Constant(name: String)) => doSomething(name) }).headOption
}