Creating a scala Reader from a file

Question

How do you instantiate a scala.util.parsing.input.Reader to read from a file? The API mentions in passing something about PagedSeq and java.io.Reader, but it's not clear at all how to accomplish that.

Kim Stebel · Accepted Answer · 2011-10-11 00:38:37Z

8

You create a FileInputStream, pass that to an InputStreamReader and pass that to the apply method of the StreamReader companion object, which returns a StreamReader, a subtype of Reader.

scala> import scala.util.parsing.input.{StreamReader,Reader}
import scala.util.parsing.input.{StreamReader, Reader}

scala> import java.io._
import java.io._

scala> StreamReader(new InputStreamReader(new FileInputStream("test")))
res0: scala.util.parsing.input.StreamReader = scala.util.parsing.input.StreamReader@1e5a0cb

answered Oct 11, 2011 at 0:38

Kim Stebel

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1 Comment

Nicolas Rinaudo Over a year ago

I just feel I need to point out that this will load the whole file in memory, which can be an issue.

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