com.bigdata.rdf.spo

Class DistinctSPOIterator

java.lang.Object

com.bigdata.rdf.spo.DistinctSPOIterator

All Implemented Interfaces:

ICloseable, ICloseableIterator<ISPO>, Iterator<ISPO>

Deprecated.

By a simple distinct filter and a filter which strips off the context position from an SPOC. Stack them together and it does the same thing. (The fall back to the B+Tree might still be interesting if we do not have a persistent hash map to fall back on instead and we want streaming results. Otherwise use an external merge sort.)

public class DistinctSPOIterator
extends Object
implements ICloseableIterator<ISPO>

Iterator using a BTree filter out duplicate (s,p,o) tuples.

Version:

$Id: DistinctSPOIterator.java 3472 2010-08-31 16:21:47Z thompsonbry $

Author:

Bryan Thompson

See Also:

SPORelation.distinctSPOIterator(ICloseableIterator)

Constructor Summary

Constructors

Constructor and Description
DistinctSPOIterator(SPORelation spoRelation, ICloseableIterator<ISPO> src) Deprecated.

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Deprecated. Closes the iterator, releasing any associated resources.
boolean	hasNext() Deprecated. Returns immediately if there is an element waiting.
ISPO	next() Deprecated.
void	remove() Deprecated.

Methods inherited from class java.lang.Object

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

Constructor Detail

DistinctSPOIterator

public DistinctSPOIterator(SPORelation spoRelation,
                   ICloseableIterator<ISPO> src)

Deprecated.

Parameters:

src - The source iterator.

Method Detail

close

public void close()

Deprecated.

Description copied from interface: ICloseableIterator

Closes the iterator, releasing any associated resources. This method MAY be invoked safely if the iterator is already closed. Implementations of this interface MUST invoke ICloseableIterator.close() if Iterator.hasNext() method returns false to ensure that the iterator is closed (and its resources release) as soon as it is exhausted.

Note: Implementations that support Iterator.remove() MUST NOT eagerly close the iterator when it is exhausted since that would make it impossible to remove the last visited statement. Instead they MUST wait for an explicit ICloseableIterator.close() by the application.

Specified by:

close in interface ICloseable

Specified by:

close in interface ICloseableIterator<ISPO>

hasNext

public boolean hasNext()

Deprecated.

Returns immediately if there is an element waiting. Otherwise, scans ahead until it finds an element which has not already been visited. It then add the element to the set of elements already seen and saves a reference to that element to be returned by next().

Specified by:

hasNext in interface Iterator<ISPO>

next

public ISPO next()

Deprecated.

Specified by:

next in interface Iterator<ISPO>

remove

public void remove()

Deprecated.

Specified by:

remove in interface Iterator<ISPO>