Interface MappingFunction

  • All Known Implementing Classes:
    CompiledAxisMappingFunction, ForExpression.MappingAction, ForSequenceMappingAction

    public interface MappingFunction
    MappingFunction is an interface that must be satisfied by an object passed to a MappingIterator. It represents an object which, given an Item, can return a SequenceIterator that delivers a sequence of zero or more Items.

    It maps an item of class F to a sequence of items of class T, returned as an iterator.

    • Method Detail

      • map

        SequenceIterator map​(Item item)
                      throws XPathException
        Map one item to a sequence.
        item - The item to be mapped.
        one of the following: (a) a SequenceIterator over the sequence of items that the supplied input item maps to, or (b) null if it maps to an empty sequence.
        XPathException - if a dynamic error occurs