foo.scala

  case class InputIterator(file: File) extends Iterable[LabelledDocument] {

    val lines = Source.fromFile(file).getLines()

    override def iterator: Iterator[LabelledDocument] = {
      lines.map {
        line =>
          val fields = line.split("\t")
          val label = fields(0)
          val text = fields(2) // Ignore 1 as this is just the active/inactive flag
          val doc = new LabelledDocument()
          doc.setLabel(label)
          doc.setContent(text)
          doc
      }
    }
    
  }