net.sf.saxon.expr

Interface ItemMappingFunction<F extends Item,T extends Item>

All Known Implementing Classes:

AtomicSequenceConverter.AtomicSequenceMappingFunction, AtomicSequenceConverter.ToStringMappingFunction, AtomicSequenceMappingFunction, CompiledItemMappingFunction, EmptyTextNodeRemover, ForExpression.MappingAction, ForItemMappingAction, FunctionSequenceCoercer.Coercer, ItemTypeCheckingFunction, JavaExtensionFunctionCall.ConfigurationCheckingFunction, KeyFn.SubtreeFilter, WherePopulated

public interface ItemMappingFunction<F extends Item,T extends Item>

ItemMappingFunction is an interface that must be satisfied by an object passed to a ItemMappingIterator. It represents an object which, given an Item, can return either another Item, or null.

The interface is generic, paramterized by F (from) the input item type, and T (to), the output item type

Method Summary

Methods

Modifier and Type	Method and Description
T	mapItem(F item) Map one item to another item.

Method Detail

mapItem

T mapItem(F item)
                       throws XPathException

Map one item to another item.

Parameters:

item - The input item to be mapped.

Returns:

either the output item, or null.

Throws:

XPathException - if a dynamic error occurs