Type conversion of declarative client URI argument

Question

I am implementing a declarative client in Micronaut that looks like this:

@Get("/dostuff{?requestObject*}")
fun getStuff(requestObject: MyRequestObject): String

My MyRequestObject contains an enum that is represented by some string:

data class MyRequestObject(val myEnum: MyEnum)

enum class MyEnum(val stringRep: String) {
  AREASONABLENAME("someSillyString");
}

When I now send a request via the client the value from requestObject generates the following query /?myEnum=AREASONABLENAME. What I actually need is /?myEnum=someSillyString.

I tried the following things without any success:

1. add JsonValue function to MyEnum: @JsonValue fun getJsonValue() = stringRep - of course did not help

2. implement a TypeConverter for MyEnum

   @Singleton
   class MyEnumTypeConverter : TypeConverter<MyEnum, String> {
       override fun convert(`object`: MyEnum?, targetType: Class<String>?, context: ConversionContext?): Optional<String> {
           return Optional.ofNullable(`object`?.stringRep)
       }
   }
   

Is there a way to achieve the desired behaviour?

Answer 1

You can override the toString method in the Enum so that when the converter tries to convert it to a string you can control the result of the operation:

enum class MyEnum(val stringRep: String) {
  AREASONABLENAME("someSillyString");

  override fun toString(): String {
    return stringRep
  }
}