net.sf.saxon.s9api

Class XdmEmptySequence

Implemented Interfaces:
Iterable

public class XdmEmptySequence
extends XdmValue

The class XdmEmptySequence represents an empty sequence in the XDM Data Model.

This is a singleton class: there is only one instance, which may be obtained using the getInstance() method.

An empty sequence may also be represented by an XdmValue whose length happens to be zero. Applications should therefore not test to see whether an object is an instance of this class in order to decide whether it is empty.

Note: in interfaces that expect an XdmItem, an empty sequence is represented by a Java null value.

Method Summary

static XdmEmptySequence
getInstance()
Return the singleton instance of this class
@Override
int size()
Get the number of items in the sequence

Methods inherited from class net.sf.saxon.s9api.XdmValue

getUnderlyingValue, itemAt, iterator, setValue, size, wrap

Method Details

getInstance

public static XdmEmptySequence getInstance()
Return the singleton instance of this class
Returns:
an XdmValue representing an empty sequence

int size

public @Override int size()
Get the number of items in the sequence
Returns:
the number of items in the value - always zero