net.sf.saxon.expr.flwor

Class DiagnosticClausePull

java.lang.Object

net.sf.saxon.expr.flwor.TuplePull

net.sf.saxon.expr.flwor.DiagnosticClausePull

public class DiagnosticClausePull
extends TuplePull

Implements the trace clause in a FLWOR expression. This is a Saxon extension that displays the value of a user-specified expression as the tuple stream is evaluated

Constructor Summary

Constructors

Constructor and Description
DiagnosticClausePull(TuplePull base, DiagnosticClause diagClause)

Method Summary

Modifier and Type	Method and Description
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

DiagnosticClausePull

public DiagnosticClausePull(TuplePull base,
                            DiagnosticClause diagClause)

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 - if any error occurs

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