Class Sum.SumFnElaborator

Enclosing class:
Sum

public static class Sum.SumFnElaborator extends ItemElaborator
  • Constructor Details

    • SumFnElaborator

      public SumFnElaborator()
  • Method Details

    • elaborateForItem

      public ItemEvaluator elaborateForItem()
      Description copied from class: Elaborator
      Get a function that evaluates the underlying expression in the form of a Item. This must only be called for expressions whose result has cardinality zero or one.
      Specified by:
      elaborateForItem in class ItemElaborator
      Returns:
      an evaluator for the expression that returns an Item, or null to represent an empty sequence.