Scala example source code file (package.scala)

This example Scala source code file (package.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

anyval, concurrent, double, duration, durationconversions, finiteduration, hours, int, long, minutes, timeunit

The package.scala Scala example source code

package scala.concurrent

import scala.language.implicitConversions

package object duration {
  /**
   * This object can be used as closing token if you prefer dot-less style but do not want
   * to enable language.postfixOps:
   *
   * {{{
   * import scala.concurrent.duration._
   *
   * val duration = 2 seconds span
   * }}}
   */
  object span

  /**
   * This object can be used as closing token for declaring a deadline at some future point
   * in time:
   *
   * {{{
   * import scala.concurrent.duration._
   *
   * val deadline = 3 seconds fromNow
   * }}}
   */
  object fromNow

  type TimeUnit          = java.util.concurrent.TimeUnit
  final val DAYS         = java.util.concurrent.TimeUnit.DAYS
  final val HOURS        = java.util.concurrent.TimeUnit.HOURS
  final val MICROSECONDS = java.util.concurrent.TimeUnit.MICROSECONDS
  final val MILLISECONDS = java.util.concurrent.TimeUnit.MILLISECONDS
  final val MINUTES      = java.util.concurrent.TimeUnit.MINUTES
  final val NANOSECONDS  = java.util.concurrent.TimeUnit.NANOSECONDS
  final val SECONDS      = java.util.concurrent.TimeUnit.SECONDS

  implicit def pairIntToDuration(p: (Int, TimeUnit)): Duration         = Duration(p._1.toLong, p._2)
  implicit def pairLongToDuration(p: (Long, TimeUnit)): FiniteDuration = Duration(p._1, p._2)
  implicit def durationToPair(d: Duration): (Long, TimeUnit)           = (d.length, d.unit)

  implicit final class DurationInt(private val n: Int) extends AnyVal with DurationConversions {
    override protected def durationIn(unit: TimeUnit): FiniteDuration = Duration(n.toLong, unit)
  }

  implicit final class DurationLong(private val n: Long) extends AnyVal with DurationConversions {
    override protected def durationIn(unit: TimeUnit): FiniteDuration = Duration(n, unit)
  }

  implicit final class DurationDouble(private val d: Double) extends AnyVal with DurationConversions {
    override protected def durationIn(unit: TimeUnit): FiniteDuration =
      Duration(d, unit) match {
        case f: FiniteDuration => f
        case _ => throw new IllegalArgumentException("Duration DSL not applicable to " + d)
      }
  }

  /*
   * Avoid reflection based invocation by using non-duck type
   */
  implicit final class IntMult(private val i: Int) extends AnyVal {
    def *(d: Duration) = d * i.toDouble
    def *(d: FiniteDuration) = d * i.toLong
  }

  implicit final class LongMult(private val i: Long) extends AnyVal {
    def *(d: Duration) = d * i.toDouble
    def *(d: FiniteDuration) = d * i.toLong
  }

  implicit final class DoubleMult(private val f: Double) extends AnyVal {
    def *(d: Duration) = d * f.toDouble
  }
}