Package net.sf.saxon.expr

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

All Known Implementing Classes:
ForExpression.MappingAction, StandardCollectionURIResolver.FileExpander
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.

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

  • Method Summary

    Modifier and Type
    Method
    Description
    SequenceIterator<? extends T>
    map(F item)
    Map one item to a sequence.

  • Method Details

    • map

      SequenceIterator<? extends 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