net.sf.saxon.expr.flwor
Class ForClausePull

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

Direct Known Subclasses:

ForClauseOuterPull

public class ForClausePull
extends TuplePull

This class implements the changes to the tuple stream effected by a "for" clause in a FLWOR expression

Field Summary

protected TuplePull	base
protected SequenceIterator	currentIteration
protected ForClause	forClause

Constructor Summary

ForClausePull(TuplePull base, ForClause forClause)

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

Field Detail

base

protected TuplePull base

forClause

protected ForClause forClause

currentIteration

protected SequenceIterator currentIteration

Constructor Detail

ForClausePull

public ForClausePull(TuplePull base,
                     ForClause forClause)

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