com.saxonica.bytecode.map
Class ForItemMappingAction

java.lang.Object
  com.saxonica.bytecode.map.ForItemMappingAction

All Implemented Interfaces:

ItemMappingFunction, StatefulMappingFunction

public abstract class ForItemMappingAction
extends Object
implements ItemMappingFunction, StatefulMappingFunction

The ForSequenceMappingAction supports compilation of a ForExpression. It represents the action to be taken for each item in the source sequence. It acts as the MappingFunction for the mapping iterator. The map() method is generated in the subclass, and performs the "action" part of the for expression, being called once per iteration, and returning an iterator over the results.

Field Summary

protected XPathContext	context
protected int	position

Constructor Summary

ForItemMappingAction()

Method Summary

StatefulMappingFunction	getAnother() Return a clone of this MappingFunction, with the state reset to its state at the beginning of the underlying iteration
abstract Item	mapItem(Item item) Map one item to another item.
void	setContext(XPathContext context)

Methods inherited from class java.lang.Object

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

Field Detail

context

protected XPathContext context

position

protected int position

Constructor Detail

ForItemMappingAction

public ForItemMappingAction()

Method Detail

setContext

public void setContext(XPathContext context)

mapItem

public abstract 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

getAnother

public StatefulMappingFunction getAnother()

Description copied from interface: StatefulMappingFunction

Return a clone of this MappingFunction, with the state reset to its state at the beginning of the underlying iteration

Specified by:

getAnother in interface StatefulMappingFunction

Returns:

a clone of this MappingFunction