net.sf.saxon.expr.flwor
Class SingularityPull

java.lang.Object
  extended by net.sf.saxon.expr.flwor.TuplePull
      extended by 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
SingularityPull()
           
 
Method Summary
 boolean nextTuple(XPathContext context)
          Move on to the next tuple.
 
Methods inherited from class net.sf.saxon.expr.flwor.TuplePull
close
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

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.


Copyright (c) 2004-2011 Saxonica Limited. All rights reserved.