net.sf.saxon.expr.flwor
Class LetClausePull

java.lang.Object
  net.sf.saxon.expr.flwor.TuplePull
      net.sf.saxon.expr.flwor.LetClausePull

public class LetClausePull
extends TuplePull

Implements the changes to a tuple stream effected by the Let clause in a FLWOR expression

Constructor Summary

LetClausePull(TuplePull base, LetClause letClause)

Method Summary

void	close() Close the tuple stream, indicating that although not all tuples have been read, no further tuples are required and resources can be released
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

Constructor Detail

LetClausePull

public LetClausePull(TuplePull base,
                     LetClause letClause)

Method Detail

nextTuple

public boolean nextTuple(XPathContext context)
                  throws XPathException

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.

Throws:

XPathException

close

public void close()

Close the tuple stream, indicating that although not all tuples have been read, no further tuples are required and resources can be released

Overrides:

close in class TuplePull