net.sf.saxon.expr

Class ItemFilter

java.lang.Object

net.sf.saxon.expr.ItemFilter

All Implemented Interfaces:

ItemMappingFunction

public class ItemFilter
extends java.lang.Object
implements ItemMappingFunction

ItemMapper is an implementation of ItemMappingFunction that wraps a predicate function typically supplied as a lambda expression: unlike a standard Predicate, however, the test is allowed to throw an XPathException.

NOTE: Java allows a lambda expression to be used wherever an ItemMappingFunction is needed, but C# does not (it's not possible in C# to have a class implementing a delegate). So if a lambda expression is wanted, use an ItemFilter or ItemMapper as a wrapper.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	ItemFilter.Lambda

Method Summary

Modifier and Type	Method and Description
Item	mapItem(Item item) Map one item to another item.
static ItemFilter	of(ItemFilter.Lambda lambda)

Methods inherited from class java.lang.Object

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

Method Detail

of

public static ItemFilter of(ItemFilter.Lambda lambda)

mapItem

public Item mapItem(Item item)
             throws XPathException

Map one item to another item.

Specified by:

mapItem in interface ItemMappingFunction

Parameters:

item - The input item to be mapped.

Returns:

either the output item, or null.

Throws:

XPathException - if a dynamic error occurs