[writing-async-app-in-scala-part-1] BooleanOps3

BooleanOps3.scala

implicit class FutureOfBooleanExtensions(val future: Future[Boolean]) extends AnyVal {
  def &&(other: => BooleanOrFutureOfBoolean): Future[Boolean] =
    v.flatMap(
      if (_)
        other match {
          case Bool(otherValue) => Future.successful(otherValue)
          case Fut(future) => future
        }
      else
        Future.successful(false)
    )
}

@implicitNotFound("This method supports only arguments of type Boolean OR Future[Boolean]")
sealed trait BooleanOrFutureOfBoolean

object BooleanOrFutureOfBoolean {
  case class Bool(value: Boolean) extends BooleanOrFutureOfBoolean
  case class Fut(future: Future[Boolean]) extends BooleanOrFutureOfBoolean

  implicit def `Boolean to BooleanOrFutureOfBoolean`(v: Boolean): BooleanOrFutureOfBoolean = Bool(v)
  implicit def `Future[Boolean] to BooleanOrFutureOfBoolean`(v: Future[Boolean]): BooleanOrFutureOfBoolean = Fut(v)
}