net.sf.saxon.expr
Class ItemTypeCheckingFunction<T extends Item>

java.lang.Object
  net.sf.saxon.expr.ItemTypeCheckingFunction<T>

Type Parameters:

T - Defines a subtype of item to be checked

All Implemented Interfaces:

ItemMappingFunction<T,T>

public class ItemTypeCheckingFunction<T extends Item>
extends Object
implements ItemMappingFunction<T,T>

A mapping function for use in conjunction with an ItemMappingIterator that checks that all the items in a sequence are instances of a given item type

Constructor Summary

ItemTypeCheckingFunction(ItemType requiredItemType, RoleLocator role, SourceLocator locator, XPathContext context)
Create the type-checking function

Method Summary

T	mapItem(T item) Map one item to another item.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ItemTypeCheckingFunction

public ItemTypeCheckingFunction(ItemType requiredItemType,
                                RoleLocator role,
                                SourceLocator locator,
                                XPathContext context)

Create the type-checking function

Parameters:

requiredItemType - the item type that all items in the sequence must conform to

role - information for error messages

context - the external evaluation context

Method Detail

mapItem

public T mapItem(T item)
                       throws XPathException

Description copied from interface: ItemMappingFunction

Map one item to another item.

Specified by:

mapItem in interface ItemMappingFunction<T extends Item,T extends Item>

Parameters:

item - The input item to be mapped.

Returns:

either the output item, or null.

Throws:

XPathException - if a dynamic error occurs