net.sf.saxon.expr
Interface MappingFunction

All Known Subinterfaces:
StatefulMappingFunction
All Known Implementing Classes:
Atomizer.AtomizingFunction, ForExpression.MappingAction, TupleSorter.TupleUnwrapper

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.


Method Summary
 SequenceIterator map(Item item)
          Map one item to a sequence.
 

Method Detail

map

SequenceIterator map(Item 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


Copyright (c) Saxonica Limited. All rights reserved.