net.sf.saxon.expr.sort
Class TupleSorter.TupleUnwrapper

java.lang.Object
  extended by net.sf.saxon.expr.sort.TupleSorter.TupleUnwrapper
All Implemented Interfaces:
MappingFunction
Enclosing class:
TupleSorter

public static class TupleSorter.TupleUnwrapper
extends Object
implements MappingFunction

Mapping function to map the wrapped objects returned by the SortedTupleIterator into real items. This is done because each tuple may actually represent a sequence of underlying values that share the same sort key.


Method Summary
static TupleSorter.TupleUnwrapper getInstance()
          Get the singular instance of this class
 SequenceIterator map(Item item)
          Map one item to a sequence.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Method Detail

getInstance

public static TupleSorter.TupleUnwrapper getInstance()
Get the singular instance of this class

Returns:
the singular instance

map

public SequenceIterator map(Item item)
                     throws XPathException
Description copied from interface: MappingFunction
Map one item to a sequence.

Specified by:
map in interface MappingFunction
Parameters:
item - The item to be mapped.
Returns:
one of the following: (a) a SequenceIterator over the sequence of items that the supplied input item maps to, or (b) null if it maps to an empty sequence.
Throws:
XPathException


Copyright (c) 2004-2010 Saxonica Limited. All rights reserved.