Package net.sf.saxon.expr.flwor

Class SingularityPull

java.lang.Object

net.sf.saxon.expr.flwor.TuplePull

net.sf.saxon.expr.flwor.SingularityPull

public class SingularityPull
extends TuplePull

The "singularity" tuple stream delivers a single empty tuple. It is the base tuple stream for the outermost for/let clause in a FLWOR expression

Constructor Summary

Constructors

Constructor	Description
SingularityPull()

Method Summary

Modifier and Type	Method	Description
boolean	nextTuple(XPathContext context)	Move on to the next tuple.

Methods inherited from class java.lang.Object

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

Methods inherited from class net.sf.saxon.expr.flwor.TuplePull

close

Constructor Detail

SingularityPull

public SingularityPull()

Method Detail

nextTuple

public boolean nextTuple(XPathContext context)

Move on to the next tuple. Before returning, this method must set all the variables corresponding to the "returned" tuple in the local stack frame associated with the context object

Specified by:

nextTuple in class TuplePull

Parameters:

context - the dynamic evaluation context

Returns:

true if another tuple has been generated; false if the tuple stream is exhausted. If the method returns false, the values of the local variables corresponding to this tuple stream are undefined.