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

java.lang.Object
  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