net.sf.saxon.expr
Class ForExpression.MappingAction

java.lang.Object
  net.sf.saxon.expr.ForExpression.MappingAction

All Implemented Interfaces:

ItemMappingFunction, MappingFunction, StatefulMappingFunction

Enclosing class:

ForExpression

protected static class ForExpression.MappingAction
extends Object
implements MappingFunction, ItemMappingFunction, StatefulMappingFunction

The MappingAction represents the action to be taken for each item in the source sequence. It acts as the MappingFunction for the mapping iterator, and also as the Binding of the position variable (at $n) in XQuery, if used.

Constructor Summary

ForExpression.MappingAction(XPathContext context, int slotNumber, int pslot, Expression action)

Method Summary

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

Constructor Detail

ForExpression.MappingAction

public ForExpression.MappingAction(XPathContext context,
                                   int slotNumber,
                                   int pslot,
                                   Expression action)

Method Detail

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

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

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