Little Typeclass example

output.txt

TwoPart(one,two)

ThreePart(one,two,three)

RowParser.scala

case class Row(rowstring: String)

trait RowParse[A]{
  def parse(row:Row):A
}

case class TwoPart(v1: String, v2: String)

case class ThreePart(v1: String, v2: String, v3: String)

implicit object TwoPartParse extends RowParse[TwoPart]{
  def parse(row: Row)={
    val parts=row.rowstring.split(',')
    TwoPart(parts(0),parts(1))
  }
}

implicit object ThreePartParse extends RowParse[ThreePart]{
  def parse(row: Row)={
    val parts=row.rowstring.split(',')
    ThreePart(parts(0),parts(1),parts(2))
  }
}

object RowParse{
  def parse[A](row:Row)(implicit ev: RowParse[A]):A={
    ev.parse(row)
  }
}


val row2=Row("one,two")

println(RowParse.parse[TwoPart](row2))


val row3=Row("one,two,three")

println(RowParse.parse[ThreePart](row3))