net.sf.saxon.expr

Interface ItemMappingFunction

All Known Implementing Classes:

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

public interface ItemMappingFunction

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

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

Method Detail

mapItem

Item mapItem(Item 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