Package net.sf.saxon.expr

Class ForExpression.MappingAction

java.lang.Object

net.sf.saxon.expr.ForExpression.MappingAction

All Implemented Interfaces:

ItemMappingFunction, MappingFunction

Enclosing class:

ForExpression

public static class ForExpression.MappingAction
extends Object
implements MappingFunction, ItemMappingFunction

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

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

Parameters:

item - The input item to be mapped.

Returns:

either the output item, or null.

Throws:

XPathException - if a dynamic error occurs