gistfile1.scala

package TicTacToe

import TicTacToe.Player._
import spray.json._

/**
 * Created by ferdy on 3/23/15.
 */

sealed trait Player

object Player {
  case object X extends Player
  case object O extends Player
  case object None extends Player

  implicit object PlayerJsonFormat extends JsonFormat[Player] {
    override def read(json: JsValue): Player = json match {
      case JsString("X") => X
      case JsString("O") => O
      case JsString("None") => None
      case _ => throw new DeserializationException("Not a player")
    }

    override def write(player: Player): JsString = player match {
      case X => JsString("X")
      case O => JsString("O")
      case None => JsString("None")
    }
  }
}

object Main extends App {
  println(X.toJson)
}