Case class localization sample

case_class_localization.scala

sealed trait Localizator {
  def apply(s: State): String
}

sealed trait State {
  def name(implicit loc: Localizator): String = loc.apply(this)
}

sealed trait OkState extends State
sealed trait ErrorState extends State

object OkState {
  case object Ok extends OkState
}

object ErrorState {
  case object Error extends ErrorState
}

class Ru extends Localizator {
  import OkState._
  import ErrorState._

  override def apply(s: State): String = s match {
    case Ok => "Хорошо"
    case Error => "Плохо"
  }
}

class En extends Localizator {
  import OkState._
  import ErrorState._

  override def apply(s: State): String = s match {
    case Ok => "Good"
    case Error => "Bad"
  }
}

import OkState._
import ErrorState._

implicit val loc = new En

val v1 = Error.name
val v2 = Ok.name