“close” a Stream?

Question

I am reading text from a java BufferedReader like this:

Stream.continually(reader.readLine).takeWhile { 
   case null => reader.close; false         


        

Answer 1

You can get the .whenDone behaviour by appending another Stream. This makes the code a bit more expressive and could also be used in other cases. It is something but I guess far from perfect.

def closeStream: Stream[Nothing] = {
  reader.close
  Stream.Empty
}

Stream.continually(reader.readLine).takeWhile(_ != null) #::: closeStream