Instance object...scalafied!

instance_v03.scala

object Instance {
    def parseCSV( instanceAsCSVString: String): Instance = {
        def extractFeatureValues( tokenizedFeatures: List[ String]): List[ Option[Double]] = {
            tokenizedFeatures.map { token =>
                try {
                    Some( token.toDouble)
                } catch {
                    case nfe: NumberFormatException => {
                        if ( token == "?") {
                            None
                        } else {
                            throw new MalformedInstanceException
                        }
                    }
                }
            }
        }
        val tokenizedInstance = instanceAsCSVString.split( ",").toList
        val featureValues = extractFeatureValues( tokenizedInstance.init)
        val classLabel = tokenizedInstance.last
        new Instance( featureValues, Some( classLabel))
    }   
}