gnu.xquery.util
Class RelativeStepFilter

java.lang.Object
  gnu.lists.FilterConsumer
      gnu.xquery.util.RelativeStepFilter

All Implemented Interfaces:

Consumer, PositionConsumer

public class RelativeStepFilter
extends FilterConsumer
implements PositionConsumer

Used to filter the output of RelativeStep. Atomic values are passed though as-is, while node values are sorted by document order and duplicates removed. An exception is thrown if there is a mix of atoms and nodes. Informally: E1/E2 is implemented as: RelativeStepFilter(for $dot in E1 return E2).

Field Summary

Fields inherited from class gnu.lists.FilterConsumer

attributeType, base, inAttribute, skipping

Constructor Summary

RelativeStepFilter(Consumer base)

Method Summary

protected void	beforeContent()
void	consume(SeqPosition position) Consume node at current position.
void	finish()
void	writeObject(java.lang.Object v)
void	writePosition(AbstractSequence seq, int ipos) Consume a single position pair.

Methods inherited from class gnu.lists.FilterConsumer

endAttribute, endDocument, endElement, ignoring, startAttribute, startDocument, startElement, write, write, write, write, writeBoolean, writeDouble, writeFloat, writeInt, writeLong

Methods inherited from class java.lang.Object

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

Constructor Detail

RelativeStepFilter

public RelativeStepFilter(Consumer base)

Method Detail

consume

public void consume(SeqPosition position)

Description copied from interface: PositionConsumer

Consume node at current position. The caller may invalidate or change the position after consume returns, so if the consumer wants to save it, it needs to copy it.

Specified by:

consume in interface PositionConsumer

writeObject

public void writeObject(java.lang.Object v)

Specified by:

writeObject in interface Consumer

Overrides:

writeObject in class FilterConsumer

beforeContent

protected void beforeContent()

Overrides:

beforeContent in class FilterConsumer

writePosition

public void writePosition(AbstractSequence seq,
                          int ipos)

Description copied from interface: PositionConsumer

Consume a single position pair. This PositionConsumer may assume the sequence does no reference management; i.e. that copyPos is trivial and releasePos is a no-op. If that is not the case, use consume(TreePosition) instead.

Specified by:

writePosition in interface PositionConsumer

finish

public void finish()