Package net.sf.saxon.expr.flwor

Class ReturnClausePush

java.lang.Object

net.sf.saxon.expr.flwor.TuplePush

net.sf.saxon.expr.flwor.ReturnClausePush

public class ReturnClausePush
extends TuplePush

The class represents the final stage in a push-mode tuple pipeline. The previous stages have stored the values corresponding to the current tuple in local variables on the stack; all that remains is to evaluate the return expression (with reference to these variables) and send the results to the current receiver.

Constructor Summary

Constructors

Constructor	Description
ReturnClausePush(Expression returnExpr)

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

Constructor Detail

ReturnClausePush

public ReturnClausePush(Expression returnExpr)

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