Interface MappingFunction<F extends Item,​T extends Item>

  • All Known Implementing Classes:
    Atomizer.AtomizingFunction, ForExpression.MappingAction

    public interface MappingFunction<F extends Item,​T extends Item>
    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. This is a generic interface, where F represents the type of the input to the mapping function, and T represents the type of the result
    • Method Detail

      • map

        SequenceIterator<T> map​(F item)
                         throws XPathException
        Map one item to a sequence.
        Parameters:
        item - The item to be mapped.
        Returns:
        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.
        Throws:
        XPathException - if a dynamic error occurs