net.axyana.qizxopen.xquery.dm
Class DistinctNodeSequence

java.lang.Object
  net.axyana.qizxopen.xquery.dt.BaseValue
      net.axyana.qizxopen.xquery.dm.NodeSequenceBase
          net.axyana.qizxopen.xquery.dm.DistinctNodeSequence

All Implemented Interfaces:

java.io.Serializable, XQItem, XQValue

public class DistinctNodeSequence

extends NodeSequenceBase

Node Filter removing duplicates.

See Also:

Serialized Form

Field Summary

Fields inherited from interface net.axyana.qizxopen.xquery.XQItem

INCOMPARABLE

Constructor Summary

DistinctNodeSequence(XQValue source)

Method Summary

XQValue	bornAgain() Returns a new version of the sequence in its initial state.
XQNode	getNode() Gets the item as a Node value.
boolean	next() Attempts to get the next atomic item.

Methods inherited from class net.axyana.qizxopen.xquery.dm.NodeSequenceBase

asAtom, compareTo, getBoolean, getDouble, getInteger, getItem, getString, getType, isNode

Methods inherited from class net.axyana.qizxopen.xquery.dt.BaseValue

deepEqual, getDecimal, getFloat, hasQuickIndex, nextCollection, quickCount, quickIndex, setLazy, worthExpanding

Methods inherited from class java.lang.Object

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

Constructor Detail

DistinctNodeSequence

public DistinctNodeSequence(XQValue source)

Method Detail

getNode

public XQNode getNode()

Description copied from interface: XQItem

Gets the item as a Node value.

Specified by:

getNode in interface XQItem

Specified by:

getNode in class NodeSequenceBase

next

public boolean next()
             throws XQueryException

Description copied from interface: XQValue

Attempts to get the next atomic item. If true is returned, the item value is available through one of the specialized accessors.

Throws:

XQueryException

bornAgain

public XQValue bornAgain()

Description copied from interface: XQValue

Returns a new version of the sequence in its initial state. Value objects are in principle immutable, but due to the iterative implementation style (see the XQValue.next() method), this is not actually true. Therefore when a value is used several times (in particular the value of a variable), there is a need for "regeneration".

NOTE: this needs not be a deep copy, because only the state of the iterator is concerned, not the underlying data.