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Scala example source code file (NullPrintStream.scala)

This example Scala source code file (NullPrintStream.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Scala tags/keywords

bytearrayoutputstream, console, console, io, nullprintstream, nullprintstream, printstream, system, system, t, t

The Scala NullPrintStream.scala source code

/* NSC -- new Scala compiler
 * Copyright 2005-2011 LAMP/EPFL
 * @author Paul Phillips
 */

package scala.tools.nsc
package io

import java.io.{ PrintStream, ByteArrayOutputStream }

/** A sink for when you want to discard all output.
 */
class NullPrintStream extends PrintStream(new ByteArrayOutputStream()) { }

object NullPrintStream extends NullPrintStream {
  def setOut() = Console setOut this
  def setErr() = Console setErr this
  def setOutAndErr() = { setOut() ; setErr() }
  def sinkingOutAndErr[T](body: => T): T =
    Console.withOut(this) {
      Console.withErr(this) {
        body
      }
    }
  
  def sinkingSystemOutAndErr[T](body: => T): T = {
    val savedOut = System.out
    val savedErr = System.err
    System setOut NullPrintStream
    System setErr NullPrintStream
    try body
    finally {
      System setOut savedOut
      System setErr savedErr
    }
  }
}

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