gistfile1.scala

new Iterator[DayRecord] {
      var numRecords = 0
      var nextRecord = actualNext()

      def next() = nextRecord match {
        case Some(x) => {
          nextRecord = actualNext()
          x
        }
        case _ => throw new NoSuchElementException()
      }

      def actualNext() = {
        try {
          if (skipAmount > numRecords)
            for (i <- Range(0, skipAmount - numRecords)) {
              in.readObject().asInstanceOf[DayRecord]
              numRecords += 1
            }
          val d = in.readObject().asInstanceOf[DayRecord]
          numRecords += 1
          if (numRecords % 100000 == 0)
            println("Loaded %d of %d records [%.2f%% done]".format(numRecords, total, numRecords * 100.0 / total))
          Some(d)
        } catch {
          case e: EOFException => None
        }
      }

      def hasNext = nextRecord match {
        case None => false
        case _ => true
      }
    }
  }