de.lmu.ifi.dbs.elki.database.query.range

Class LinearScanPrimitiveDistanceRangeQuery<O>

java.lang.Object

de.lmu.ifi.dbs.elki.database.query.range.AbstractDistanceRangeQuery<O>

de.lmu.ifi.dbs.elki.database.query.range.LinearScanPrimitiveDistanceRangeQuery<O>

Type Parameters:

O - Database object type

All Implemented Interfaces:

DatabaseQuery, RangeQuery<O>

Direct Known Subclasses:

LinearScanEuclideanDistanceRangeQuery

public class LinearScanPrimitiveDistanceRangeQuery<O>
extends AbstractDistanceRangeQuery<O>

Default linear scan range query class. Subtle optimization: for primitive distances, retrieve the query object only once from the relation.

Author:

Erich Schubert

Field Summary

Fields

Modifier and Type	Field and Description
private PrimitiveDistanceFunction<? super O>	rawdist Unboxed distance function.

Fields inherited from class de.lmu.ifi.dbs.elki.database.query.range.AbstractDistanceRangeQuery

distanceQuery, relation

Fields inherited from interface de.lmu.ifi.dbs.elki.database.query.DatabaseQuery

HINT_BULK, HINT_EXACT, HINT_HEAVY_USE, HINT_NO_CACHE, HINT_OPTIMIZED_ONLY, HINT_SINGLE

Constructor Summary

Constructors

Constructor and Description
LinearScanPrimitiveDistanceRangeQuery(PrimitiveDistanceQuery<O> distanceQuery) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
DoubleDBIDList	getRangeForDBID(DBIDRef id, double range) Get the neighbors for a particular id in a given query range
void	getRangeForDBID(DBIDRef id, double range, ModifiableDoubleDBIDList neighbors) Get the neighbors for a particular object in a given query range
DoubleDBIDList	getRangeForObject(O obj, double range) Get the neighbors for a particular object in a given query range
void	getRangeForObject(O obj, double range, ModifiableDoubleDBIDList neighbors) Get the neighbors for a particular object in a given query range
private void	linearScan(Relation<? extends O> relation, DBIDIter iter, O obj, double range, ModifiableDoubleDBIDList result) Main loop for linear scan,

Methods inherited from class java.lang.Object

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

Field Detail

rawdist

private PrimitiveDistanceFunction<? super O> rawdist

Unboxed distance function.

Constructor Detail

LinearScanPrimitiveDistanceRangeQuery

public LinearScanPrimitiveDistanceRangeQuery(PrimitiveDistanceQuery<O> distanceQuery)

Constructor.

Parameters:

distanceQuery - Distance function to use

Method Detail

getRangeForDBID

public DoubleDBIDList getRangeForDBID(DBIDRef id,
                             double range)

Description copied from interface: RangeQuery

Get the neighbors for a particular id in a given query range

Specified by:

getRangeForDBID in interface RangeQuery<O>

Overrides:

getRangeForDBID in class AbstractDistanceRangeQuery<O>

Parameters:

id - query object ID

range - Query range

Returns:

neighbors

getRangeForObject

public DoubleDBIDList getRangeForObject(O obj,
                               double range)

Description copied from interface: RangeQuery

Get the neighbors for a particular object in a given query range

Specified by:

getRangeForObject in interface RangeQuery<O>

Overrides:

getRangeForObject in class AbstractDistanceRangeQuery<O>

Parameters:

obj - Query object

range - Query range

Returns:

neighbors

getRangeForDBID

public void getRangeForDBID(DBIDRef id,
                   double range,
                   ModifiableDoubleDBIDList neighbors)

Description copied from interface: RangeQuery

Get the neighbors for a particular object in a given query range

Specified by:

getRangeForDBID in interface RangeQuery<O>

Overrides:

getRangeForDBID in class AbstractDistanceRangeQuery<O>

Parameters:

id - query object ID

range - Query range

neighbors - Neighbors output set

getRangeForObject

public void getRangeForObject(O obj,
                     double range,
                     ModifiableDoubleDBIDList neighbors)

Description copied from interface: RangeQuery

Get the neighbors for a particular object in a given query range

Parameters:

obj - Query object

range - Query range

neighbors - Neighbors output set

linearScan

private void linearScan(Relation<? extends O> relation,
              DBIDIter iter,
              O obj,
              double range,
              ModifiableDoubleDBIDList result)

Main loop for linear scan,

Parameters:

relation - Data relation

iter - Iterator

obj - Query object

range - Query radius

result - Output data structure