Language ADT

Language.scala

object Language {

  def unapply(arg: Language): Option[String] = Some(toString(arg))
  def apply(str: String): Language = fromString(str)

  val err = (k: String, e: Exception) => s"Cannot parse $k as ${this.getClass.getName()}: ${e.getMessage}"
  def toString(l:Language) = l.toString.toLowerCase
  def fromString(s: String):Language  =  s.toLowerCase match {
    case "french" => French()
    case "english" => English()
    case _ => throw new NoSuchElementException(s"Cannot parse $s as ${this.getClass.getName()}")
  }

  implicit val writes: OWrites[Language] = Json.writes[Language]
  implicit val reads: Reads[Language] = Json.reads[Language]
  implicit val languagePathBindable = new PathBindable.Parsing(fromString, toString, err)
  implicit val languageQuertyBindable = new QueryStringBindable.Parsing(fromString, toString, err)
  implicit val languageColumnType = MappedColumnType.base[Language, String]({ toString(_) }, {fromString(_)})
}