Iterator of lines of text from file

linesFromFile.scala

  def linesFromFile(filename: String): Iterator[String] = new Iterator[String] {
    val bufferedReader = {
      val fileInputStream = new FileInputStream(filename)
      val decompressedInputStream =
        if(filename.endsWith(".gz")) new GZIPInputStream(fileInputStream) else fileInputStream
      val reader = new InputStreamReader(decompressedInputStream, "UTF-8")
      new BufferedReader(reader)
    }
    private var nextLine = bufferedReader.readLine()

    override def hasNext: Boolean = nextLine != null

    override def next(): String = {
      if(nextLine == null) throw new NoSuchElementException()
      val result = nextLine
      nextLine = bufferedReader.readLine()
      if(nextLine == null) bufferedReader.close()
      result
    }
  }