reflection - Scala Class.getFields

Question

For purposes of my app I need to be able to find out a list of fields of a type (not an instance) and types of those fields in runtime. So far I was only able to get a list of methods of a case class containing getters with classOf[MyCaseClass].getMethods and nothing useful from a simple class. Am I missing something? Are there any reflection libraries for that kinda purposes? How's that done correctly?

Answer 1

Using Scala 2.10 reflection:

scala> import reflect.runtime.{universe => ru}
import reflect.runtime.{universe=>ru}
scala> trait A { val field1: Int; val field2: Char; def meth1: Int }
defined trait A
scala> val fieldSymbols = ru.typeOf[A].members.collect{ case m: ru.MethodSymbol if m.isGetter => m }
fieldSymbols: Iterable[reflect.runtime.universe.MethodSymbol] = List(value field2, value field1)

The returned symbols contain all the type information, e.g.:

scala> fieldSymbols.map(_.typeSignature)
res16: Iterable[reflect.runtime.universe.Type] = List(=> scala.Char, => scala.Int)