Package net.sf.saxon.expr

Class ForExpression.MappingAction

java.lang.Object

net.sf.saxon.expr.ForExpression.MappingAction

All Implemented Interfaces:

ItemMappingFunction<Item<?>,Item<?>>, MappingFunction<Item<?>,Item<?>>

Enclosing class:

ForExpression

public static class ForExpression.MappingAction
extends Object
implements MappingFunction<Item<?>,Item<?>>, ItemMappingFunction<Item<?>,Item<?>>

The MappingAction represents the action to be taken for each item in the source sequence. It acts as the MappingFunction for the mapping iterator.

Field Summary

Fields

Modifier and Type	Field	Description
protected XPathContext	context

Constructor Summary

Constructors

Constructor	Description
MappingAction(XPathContext context, int slotNumber, Expression action)

Method Summary

Modifier and Type	Method	Description
SequenceIterator<?>	map(Item<?> item)	Map one item to a sequence.
Item<?>	mapItem(Item<?> 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

Field Details

context

protected XPathContext context

Constructor Details

MappingAction

public MappingAction(XPathContext context,
 int slotNumber,
 Expression action)

Method Details

map

public SequenceIterator<?> map(Item<?> item)
                        throws XPathException

Description copied from interface: MappingFunction

Map one item to a sequence.

Specified by:

map in interface MappingFunction<Item<?>,Item<?>>

Parameters:

item - The item to be mapped.

Returns:

one of the following: (a) a SequenceIterator over the sequence of items that the supplied input item maps to, or (b) null if it maps to an empty sequence.

Throws:

XPathException - if a dynamic error occurs

mapItem

public Item<?> mapItem(Item<?> item)
                throws XPathException

Description copied from interface: ItemMappingFunction

Map one item to another item.

Specified by:

mapItem in interface ItemMappingFunction<Item<?>,Item<?>>

Parameters:

item - The input item to be mapped.

Returns:

either the output item, or null.

Throws:

XPathException - if a dynamic error occurs