Package net.sf.saxon.expr

Class ItemTypeCheckingFunction<T extends Item<?>>

java.lang.Object

net.sf.saxon.expr.ItemTypeCheckingFunction<T>

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

Constructors

Constructor	Description
ItemTypeCheckingFunction(ItemType requiredItemType, RoleDiagnostic role, Expression failingExpression, Configuration config)	Create the type-checking function
ItemTypeCheckingFunction(ItemType requiredItemType, RoleDiagnostic role, Location locator, Configuration config)

Method Summary

Modifier and Type	Method	Description
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,
                                RoleDiagnostic role,
                                Expression failingExpression,
                                Configuration config)

Create the type-checking function

Parameters:

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

role - information for error messages

failingExpression - the location of the expression for error messages

config - the Saxon configuration

ItemTypeCheckingFunction

public ItemTypeCheckingFunction(ItemType requiredItemType,
                                RoleDiagnostic role,
                                Location locator,
                                Configuration config)

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