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• TryUtils.scala

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es.weso.utils.TryUtils.scala Maven / Gradle / Ivy

package es.weso.utils
import util._

object TryUtils {

  /** The following code has been taken from this answer:
    * [[http://stackoverflow.com/questions/15495678/flatten-scala-try]] There may be more effcient solutions (but
    * probably less elegant)
    */
  def filterSuccess[A](xs: Seq[Try[A]]): Try[Seq[A]] =
    Try(xs.map(_.get))

  def combineAll[A, B](xs: Seq[A], current: B, comb: (A, B) => Try[Seq[B]]): Try[Seq[B]] = {
    def zero: Try[Seq[B]] = Try(Seq(current))
    def step(rest: Try[Seq[B]], x: A): Try[Seq[B]] = {
      def next(rs: Seq[B]): Try[Seq[B]] = {
        val results = rs.map(r => comb(x, r))
        val fs      = filterSuccess(results)
        fs.map(xss => xss.flatten)
      }
      rest.flatMap(next)
    }
    xs.foldLeft(zero)(step)
  }
}