JazzBandsDomain3.scala

object Domain { 
 
  sealed trait JazzBand 
 
  final case class PianoTrio(pianoPlayer: PianoPlayer, 
                             bassPlayer: BassPlayer, 
                             drummer: Drummer) extends JazzBand 
 
  final case class Quintet(saxPlayer: SaxPlayer, 
                           trumpetPlayer: TrumpetPlayer, 
                           pianoPlayer: PianoPlayer, 
                           bassPlayer: BassPlayer, 
                           drummer: Drummer) extends JazzBand 
 
 
  final case class Quartet(trumpetPlayer: TrumpetPlayer, 
                           pianoPlayer: PianoPlayer, 
                           bassPlayer: BassPlayer, 
                           drummer: Drummer) extends JazzBand 
 
  case class TrumpetPlayer private(name: String) { 
    def copy() = TrumpetPlayer(name: String) 
  } 
 
  object TrumpetPlayer { 
    def apply(name: String): Option[TrumpetPlayer] = 
      List("Miles Davis", "Freddie Hubbard").find(_ == name).map(new TrumpetPlayer(_)) 
  } 
 
  case class SaxPlayer private(name: String) { 
    def copy() = SaxPlayer(name: String) 
  } 
 
  object SaxPlayer { 
    def apply(name: String): Option[SaxPlayer] = 
      List("John Coltrane", "Charile Parker").find(_ == name).map(new SaxPlayer(_)) 
  } 
 
  case class PianoPlayer private(name: String) { 
    def copy() = PianoPlayer(name: String) 
  } 
 
  object PianoPlayer { 
    def apply(name: String): Option[PianoPlayer] = 
      List("Bill Evans", "Herbie Hancock").find(_ == name).map(new PianoPlayer(_)) 
  } 
 
  case class BassPlayer private(name: String) { 
    def copy() = BassPlayer(name) 
  } 
 
  object BassPlayer { 
    def apply(name: String): Option[BassPlayer] = 
      List("Paul Chambers", "Dave Holland").find(_ == name).map(new BassPlayer(_)) 
  } 
 
  case class Drummer private(name: String) { 
    def copy() = Drummer(name) 
  } 
 
  object Drummer { 
    def apply(name: String): Option[Drummer] = 
      List("Max Roache", "Tony Williams", "Elvin Jones").find(_ == name).map(new Drummer(_)) 
  } 
}