net.sf.saxon.expr
Interface ContextMappingFunction<T extends Item>

All Known Implementing Classes:
AnalyzeMappingFunction, CompiledContextMappingFunction, ForEach, ForEachGroup, MultithreadedForEach, SimpleStepExpression, SlashExpression

public interface ContextMappingFunction<T extends Item>

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

This is a specialization of the more general MappingFunction class: it differs in that each item being processed becomes the context item while it is being processed.


Method Summary
 SequenceIterator<T> map(XPathContext context)
          Map one item to a sequence.
 

Method Detail

map

SequenceIterator<T> map(XPathContext context)
                                     throws XPathException
Map one item to a sequence.

Parameters:
context - The processing context. The item to be mapped is the context item identified from this context: the values of position() and last() also relate to the set of items being mapped
Returns:
a SequenceIterator over the sequence of items that the supplied input item maps to
Throws:
XPathException - if a dynamic error is detected


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