Package net.sf.saxon.expr.flwor

Class WindowClausePull

java.lang.Object

net.sf.saxon.expr.flwor.TuplePull

net.sf.saxon.expr.flwor.WindowClausePull

public class WindowClausePull
extends TuplePull

Implement a sliding or tumbling window clause of a FLWOR expression in tuple-pull mode. The entire window processing is activated once for each input tuple, and it generates one output tuple for each identified window.

Method Summary

Modifier and Type	Method	Description
void	close()	Close the tuple stream, indicating that no more tuples will be supplied
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

Method Details

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 - if any error occurs

close

public void close()

Close the tuple stream, indicating that no more tuples will be supplied

Overrides:

close in class TuplePull