com.saxonica.bytecode.map
Class ForSequenceMappingAction

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

All Implemented Interfaces:

MappingFunction, StatefulMappingFunction

public abstract class ForSequenceMappingAction
extends Object
implements MappingFunction, 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

ForSequenceMappingAction()

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 SequenceIterator	map(Item item) Map one item to a sequence.
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

ForSequenceMappingAction

public ForSequenceMappingAction()

Method Detail

setContext

public void setContext(XPathContext context)

map

public abstract 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

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