Hibernate Inheritance and Using Pattern Matching

gistfile1.txt

trait PaymentSource {
  def accept[T](visitor: PsVisitor[T]) : T
}

class CreditCard extends PaymentSource{
  override def accept[T](visitor: PsVisitor[T]) = {
    visitor.visit(this)
  }
}

class Check extends PaymentSource{
  override def accept[T](visitor: PsVisitor[T]) = {
    visitor.visit(this)
  }
}

trait PsVisitor[T] {
  def visit(cc: CreditCard) : T
  def visit(ck: Check) : T
}

object PsFilter {
  def apply(ps: PaymentSource) = {
    ps.accept(new PsVisitor[PsResult] {
      def visit(cc: CreditCard) = CreditCardResult(cc)
      def visit(ck: Check) = CheckResult(ck)
    })
  }
}

trait PsResult
case class CreditCardResult(cc: CreditCard) extends PsResult
case class CheckResult(cc: Check) extends PsResult