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

Class LinearScanPrimitiveSimilarityRangeQuery<O>

java.lang.Object

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

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

Type Parameters:

O - Database object type

All Implemented Interfaces:

DatabaseQuery, RangeQuery<O>

public class LinearScanPrimitiveSimilarityRangeQuery<O>
extends AbstractSimilarityRangeQuery<O>

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

Since:

0.7.5

Author:

Erich Schubert

Field Summary

Fields

Modifier and Type	Field and Description
private PrimitiveSimilarityFunction<? super O>	rawsim Unboxed similarity function.

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

relation, simQuery

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
LinearScanPrimitiveSimilarityRangeQuery(PrimitiveSimilarityQuery<O> similarityQuery) Constructor.

Method Summary

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

rawsim

private PrimitiveSimilarityFunction<? super O> rawsim

Unboxed similarity function.

Constructor Detail

LinearScanPrimitiveSimilarityRangeQuery

public LinearScanPrimitiveSimilarityRangeQuery(PrimitiveSimilarityQuery<O> similarityQuery)

Constructor.

Parameters:

similarityQuery - Similarity 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 AbstractSimilarityRangeQuery<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 AbstractSimilarityRangeQuery<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 AbstractSimilarityRangeQuery<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