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 java.lang.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

Methods

Modifier and Type	Method and Description
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