Sample use of an Extractor and Injector in Scala

SampleExtractorInjector.scala

// Assuming we have a Name class, that accepts a firstname and lastname in its' Constructor
case class Name(firstname: String, lastname: String) { override def toString() = { firstname + "-" + lastname } }

// We could create an extractor for this that could (effectively) provide overloads for the Constructor
object Namer {
  // optional injection method
  def apply(x: String, y: String, z: Int) = Name(x,y)

  // mandatory extraction method - take the dash delim string and return Some pair of names or None
  def unapply(dashDelimName: String) = {
      var elems = dashDelimName.split("-")
      if(elems.length == 2) Some(elems(0), elems(1)) else None
  }
}

var someName = Namer("bob", "wood", 22)
Namer.unapply(someName.toString)