s_mach.datadiff.MapPatch.scala Maven / Gradle / Ivy

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package s_mach.datadiff

/**
 * A case class for a patch of a Map
 * @param add (key,value) pairs added to the map
 * @param remove keys removed from the map
 * @param change (key,value) pairs changed
 * @tparam A key type
 * @tparam B value type
 * @tparam P patch for the value type
 */
case class MapPatch[A,+B,+P]( // Note: Map is invariant for A
  add: Map[A,B],
  remove: Set[A],
  change: Map[A,P]
)

object MapPatch {
  val _noChange = MapPatch(Map.empty[Any,Any], Set.empty, Map.empty)
  def noChange[A] : MapPatch[A,Nothing,Nothing] =
    _noChange.asInstanceOf[MapPatch[A,Nothing,Nothing]]
}