Package net.sf.saxon.expr
Interface MappingFunction<F extends Item,T extends Item>
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- 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
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description SequenceIterator<T>
map(F item)
Map one item to a sequence.
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Method Detail
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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
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