Getting type from KMutableProperty.returnType

1

I am using idea 15 eap with kotlin 0.13.1514 and I am trying to get the type of a KMutableProperty.returnType. The return type is an instance of KType and I can not get any type information out of it.

Is it possible to get this information or do I need to use java reflection? There have been some reflection changes recently, so maybe this is still beging worked on?

Cheers,

Rien

2

The API for accessing types is still work in progress. At the moment you can obtain the java.lang.reflect.Type object using the "javaType" extension property located in package "kotlin.reflect.jvm": 

    val prop = MyClass::foo
    val javaType = prop.returnType.javaType
    when (javaType) {
        is Class<*> -> println("class: $javaType")
        is ParameterizedType -> println("parameterized type: $javaType")
        ...
    }
3

Hi,

Thx, I have a follow up question. It looks like getting the annotations from class member (KProperty) doesn’t work yet, is that correct?

Take this example:

@Retention(AnnotationRetention.RUNTIME)
@Target(AnnotationTarget.FIELD)
annotation class Annot()

class Test(@Annot val test: String)


fun main(args: Array<String>) {

  val cls = Test::class


  for (member in cls.members) {

  println(“Member: $member”)

  for (ann in member.annotations) {

            println(“Annotation: $ann”)

  }

  }

}


Outputs:

Member: val nl.astraeus.db.anntest.Test.test: kotlin.String
Member: fun kotlin.Any.equals(kotlin.Any?): kotlin.Boolean
Member: fun kotlin.Any.hashCode(): kotlin.Int
Member: fun kotlin.Any.toString(): kotlin.String

The @Annot annotation isn't found.

4

Ah, never mind. Looking at the post I noticed the line;

 
@Target(AnnotationTarget.FIELD)

Changing it to AnnotationTarget.PROPERTY makes the annotation show up.