com.saxonica.expr.flwor
Class GroupByClausePush

java.lang.Object
  extended by net.sf.saxon.expr.flwor.TuplePush
      extended by com.saxonica.expr.flwor.GroupByClausePush

public class GroupByClausePush
extends TuplePush

Represents the tuple stream delivered by an "group by" clause. This groups the tuple stream supplied as its input, and outputs a new set of tuples one per group of the input tuples. No groups are output until all the groups have been read.


Constructor Summary
GroupByClausePush(TuplePush destination, GroupByClause groupBy, XPathContext context)
           
 
Method Summary
 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
 void processTuple(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

GroupByClausePush

public GroupByClausePush(TuplePush destination,
                         GroupByClause groupBy,
                         XPathContext context)
Method Detail

processTuple

public void processTuple(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:
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 although not all tuples have been read, no further tuples are required and resources can be released

Overrides:
close in class TuplePush
Throws:
XPathException - if a dynamic error occurs


Copyright (c) 2004-2011 Saxonica Limited. All rights reserved.