def readOneLabel[L : ClassTag: TypeTag]()

in cassovary-core/src/main/scala/com/twitter/cassovary/util/io/LabelsReader.scala [30:62]

• 32 lines of code
• 9 McCabe index (conditional complexity)

  def readOneLabel[L : ClassTag: TypeTag](labelName: String, fileName: String,
      isSparse: Option[Boolean] = None, maxId: Option[Int] = None): Label[Int, L] = {
    val tag = implicitly[TypeTag[L]]
    if (tag != intType && tag != stringType) {
      throw new Exception("Only Int and String label values are supported right now!")
    }

    val label = (isSparse, maxId) match {
      case (Some(false), Some(m)) => new ArrayBasedLabel[L](labelName, m)
      case _ => new IntLabel[L](labelName, maxId)
    }
    var lastLineParsed = 0
    val source = Source.fromFile(fileName)
    source.getLines().foreach { line =>
      lastLineParsed += 1
      try {
        val i = line.indexOf(separator)
        val id = ParseString.toInt(line, 0, i - 1)
        val labelValue = if (tag == intType) {
          ParseString.toInt(line, i + 1, line.length - 1)
        } else if (tag == stringType) {
          line.substring(i + 1, line.length)
        }
        label.update(id, labelValue.asInstanceOf[L])
      } catch {
        case NonFatal(exc) =>
          throw new IOException("Parsing failed near line: %d in %s"
              .format(lastLineParsed, fileName), exc)
      }
    }
    source.close()
    label
  }