net.sf.saxon.expr.flwor
Class TuplePush

java.lang.Object
  net.sf.saxon.expr.flwor.TuplePush

Direct Known Subclasses:

CountClausePush, ForClauseOuterPush, ForClausePush, GroupByClausePush, LetClausePush, OrderByClausePush, ReturnClausePush, WhereClausePush, WindowClausePush

public abstract class TuplePush
extends Object

Abtract class representing a tuple stream (used to evaluate a FLWOR expression) in push mode (where the provider of tuples activates the consumer of those tuples)

Constructor Summary

TuplePush()

Method Summary

void	close() Close the tuple stream, indicating that no more tuples will be supplied
abstract 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

TuplePush

public TuplePush()

Method Detail

processTuple

public abstract 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

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

Throws:

XPathException - if a dynamic error occurs