Package net.sf.saxon.expr.flwor

Class WhereClausePush

java.lang.Object

net.sf.saxon.expr.flwor.TuplePush

net.sf.saxon.expr.flwor.WhereClausePush

public class WhereClausePush
extends TuplePush

This class represents the tuple stream delivered as the output of a where clause in a FLWOR expression: that is, it supplies all the tuples in its input stream that satisfy a specified predicate. It does not change the values of any variables in the tuple stream.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) TuplePush	destination
(package private) Expression	predicate

Constructor Summary

Constructors

Constructor	Description
WhereClausePush(TuplePush destination, Expression predicate)

Method Summary

Modifier and Type	Method	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

destination

TuplePush destination

predicate

Expression predicate

Constructor Detail

WhereClausePush

public WhereClausePush(TuplePush destination,
                       Expression predicate)

Method Detail

processTuple

public void processTuple(XPathContext context)
                  throws XPathException

Description copied from class: TuplePush

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

Description copied from class: TuplePush

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

Overrides:

close in class TuplePush

Throws:

XPathException - if a dynamic error occurs