Singleton Serializer

SingletonSerializer.scala

abstract class SingletonSerializer[T](implicit mf: Manifest[T]) extends Serializer[T] {
  val SingletonClass: Class[T] = mf.runtimeClass.asInstanceOf[Class[T]]

  def deserialize(implicit format: Formats): PartialFunction[(TypeInfo, JValue), T] = {
    case (TypeInfo(SingletonClass, _), json) if json.extractOpt[String].map(_ endsWith "$").getOrElse(false) =>
      val className = json.extract[String]
      Class.forName(className).getField("MODULE$").get().asInstanceOf[T]
  }

  def serialize(implicit format: Formats) = {
    case possibleSingleton if SingletonClass.isInstance(possibleSingleton) && possibleSingleton.getClass.getName().endsWith("$") =>
      possibleSingleton.getClass.getName()
  }
}