gistfile1.scala

implicit val bdStringView = StringView.of[BigDecimal] as { _.toString }

def makeStringValue[T](implicit sv: StringView[T]) = new StringValue {
  def getString(value: AnyRef) = sv(value.asInstanceOf[T])
}

bdStringValue = makeStringValue[BigDecimal]
strStringValue = makeStringValue[String]
qtyStringValue = makeStringValue[Long](StringView.of[Long] as { _.toString }