net.sf.saxon.expr.flwor

Class WindowClausePush

java.lang.Object

net.sf.saxon.expr.flwor.TuplePush

net.sf.saxon.expr.flwor.WindowClausePush

public class WindowClausePush
extends TuplePush

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

Field Summary

Fields

Modifier and Type	Field and Description
(package private) List<WindowClause.Window>	currentWindows

Constructor Summary

Constructors

Constructor and Description
WindowClausePush(TuplePush destination, WindowClause windowClause)

Method Summary

Modifier and Type	Method and Description
void	close() Close the tuple stream, indicating that no more tuples will be supplied
void	processTuple(XPathContext context) Notify the availability of the next tuple.

Methods inherited from class java.lang.Object

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

Field Detail

currentWindows

List<WindowClause.Window> currentWindows

Constructor Detail

WindowClausePush

public WindowClausePush(TuplePush destination,
                        WindowClause windowClause)

Method Detail

processTuple

public void processTuple(XPathContext context)
                  throws XPathException

Notify the availability of the next tuple. Before calling this method, the supplier of the tuples must set all the variables corresponding to the supplied tuple in the local stack frame associated with the context object

Specified by:

processTuple in class TuplePush

Parameters:

context - the dynamic evaluation context

Throws:

XPathException - if a dynamic error occurs

close

public void close()
           throws XPathException

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

Overrides:

close in class TuplePush

Throws:

XPathException - if a dynamic error occurs