com.xml_project.morganaxdm
Class EmptySequence

java.lang.Object
  com.xml_project.morganaxdm.XdmSequence
      com.xml_project.morganaxdm.EmptySequence

All Implemented Interfaces:

java.lang.Iterable<XdmItem>, java.util.Iterator<XdmItem>

public class EmptySequence
extends XdmSequence
implements java.util.Iterator<XdmItem>

A singleton class representing an empty sequence. There is no guarantee, all empty sequences will be instances of this class.

Field Summary

static EmptySequence

EmptySequence The empty sequence.

Method Summary

XdmItem	first() Returns the first item of this XdmSequence or throws a RuntimeException if sequence is empty.
XdmItem	get(int nr)
boolean	hasNext()
XdmItemIterator	iterator() Returns an iterator over this XdmSequence.
XdmItem	next()
void	remove() Not implementated for this Iterator
long	size() Returns the number of elements in this sequence.

Methods inherited from class com.xml_project.morganaxdm.XdmSequence

atomize, concat, get, getStringValue, hasCommonType, hasValues, isEmpty, normalize, serialize, serialize, serialize, subSequence, wrap

Methods inherited from class java.lang.Object

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

Field Detail

EmptySequence

public static final EmptySequence EmptySequence

The empty sequence.

Method Detail

get

public XdmItem get(int nr)

size

public long size()

Description copied from class: XdmSequence

Returns the number of elements in this sequence. Invoking this method will convert the underlying sequence to a materialized sequence which will take time and cost memory. See also get(n).

Overrides:

size in class XdmSequence

Returns:

the number of elements in this sequence.

iterator

public XdmItemIterator iterator()

Description copied from class: XdmSequence

Returns an iterator over this XdmSequence.

Specified by:

iterator in interface java.lang.Iterable<XdmItem>

Overrides:

iterator in class XdmSequence

hasNext

public boolean hasNext()

Specified by:

hasNext in interface java.util.Iterator<XdmItem>

next

public XdmItem next()

Specified by:

next in interface java.util.Iterator<XdmItem>

remove

public void remove()

Not implementated for this Iterator

Specified by:

remove in interface java.util.Iterator<XdmItem>

first

public XdmItem first()
              throws java.lang.RuntimeException

Description copied from class: XdmSequence

Returns the first item of this XdmSequence or throws a RuntimeException if sequence is empty.

Overrides:

first in class XdmSequence

Returns:

the first item of this sequence.

Throws:

java.lang.RuntimeException - if the sequence is empty.