def exists: Boolean = !FileSystems.`match`()

in ratatool-sampling/src/main/scala/com/spotify/ratatool/io/FileStorage.scala [40:74]

• 30 lines of code
• 10 McCabe index (conditional complexity)

  def exists: Boolean = !FileSystems.`match`(path).metadata.isEmpty

  def listFiles: Seq[Metadata] = FileSystems.`match`(path).metadata().asScala.toList

  def isDone: Boolean = {
    val partPattern = "([0-9]{5})-of-([0-9]{5})".r
    val metadata =
      try {
        listFiles
      } catch {
        case e: FileNotFoundException => Seq.empty
      }
    val nums = metadata.flatMap { meta =>
      val m = partPattern.findAllIn(meta.resourceId().toString)
      if (m.hasNext) {
        Some(m.group(1).toInt, m.group(2).toInt)
      } else {
        None
      }
    }

    if (metadata.isEmpty) {
      // empty list
      false
    } else if (nums.nonEmpty) {
      // found xxxxx-of-yyyyy pattern
      val parts = nums.map(_._1).sorted
      val total = nums.map(_._2).toSet
      metadata.size == nums.size && // all paths matched
      total.size == 1 && total.head == parts.size && // yyyyy part
      parts.head == 0 && parts.last + 1 == parts.size // xxxxx part
    } else {
      true
    }
  }