net.sf.saxon.s9api

Class XdmEmptySequence

java.lang.Object

net.sf.saxon.s9api.XdmValue

net.sf.saxon.s9api.XdmEmptySequence

All Implemented Interfaces:

Iterable<XdmItem>

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

Methods

Modifier and Type	Method and Description
static XdmEmptySequence	getInstance() Return the singleton instance of this class
int	size() Get the number of items in the sequence

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

append, getUnderlyingValue, itemAt, iterator, setValue, toString, wrap

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

getInstance

public static XdmEmptySequence getInstance()

Return the singleton instance of this class

Returns:

an XdmValue representing an empty sequence

size

public int size()

Get the number of items in the sequence

Overrides:

size in class XdmValue

Returns:

the number of items in the value - always zero