Scala Ordering Helper

CompositeOrdering.scala

final class CompositeOrdering[T]( val ord1: Ordering[T], val ord2: Ordering[T] ) extends Ordering[T] {
  def compare( x: T, y: T ) = {
    val comp = ord1.compare( x, y )
    if ( comp != 0 ) comp else ord2.compare( x, y )
  }
}

object CompositeOrdering {
  def apply[T]( orderings: Ordering[T] * ) = orderings reduceLeft (_ orElse _)

  implicit class OrderingOps[T]( val ord: Ordering[T] ) extends AnyVal {
    def orElse( ord2: Ordering[T] ) = new CompositeOrdering[T]( ord, ord2 )
  }

}

Taken from: https://stackoverflow.com/questions/14695833/scala-idiom-for-ordering-by-multiple-criteria