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

Class PreprocessorKNNQuery<O>

java.lang.Object

de.lmu.ifi.dbs.elki.database.query.knn.PreprocessorKNNQuery<O>

Type Parameters:

O - Data object type

All Implemented Interfaces:

DatabaseQuery, KNNQuery<O>

public class PreprocessorKNNQuery<O>
extends Object
implements KNNQuery<O>

Instance for a particular database, invoking the preprocessor.

Author:

Erich Schubert

Field Summary

Fields

Modifier and Type	Field and Description
private AbstractMaterializeKNNPreprocessor<O>	preprocessor The last preprocessor result
protected Relation<? extends O>	relation The data to use for this query
private boolean	warned Warn only once.

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
PreprocessorKNNQuery(Relation<O> relation, AbstractMaterializeKNNPreprocessor<O> preprocessor) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
List<KNNList>	getKNNForBulkDBIDs(ArrayDBIDs ids, int k) Bulk query method
KNNList	getKNNForDBID(DBIDRef id, int k) Get the k nearest neighbors for a particular id.
KNNList	getKNNForObject(O obj, int k) Get the k nearest neighbors for a particular id.
AbstractMaterializeKNNPreprocessor<O>	getPreprocessor() Get the preprocessor instance.

Methods inherited from class java.lang.Object

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

Field Detail

relation

protected final Relation<? extends O> relation

The data to use for this query

preprocessor

private final AbstractMaterializeKNNPreprocessor<O> preprocessor

The last preprocessor result

warned

private boolean warned

Warn only once.

Constructor Detail

PreprocessorKNNQuery

public PreprocessorKNNQuery(Relation<O> relation,
                    AbstractMaterializeKNNPreprocessor<O> preprocessor)

Constructor.

Parameters:

relation - Relation to query

preprocessor - Preprocessor instance to use

Method Detail

getKNNForDBID

public KNNList getKNNForDBID(DBIDRef id,
                    int k)

Description copied from interface: KNNQuery

Get the k nearest neighbors for a particular id.

Specified by:

getKNNForDBID in interface KNNQuery<O>

Parameters:

id - query object ID

k - Number of neighbors requested

Returns:

neighbors

getKNNForBulkDBIDs

public List<KNNList> getKNNForBulkDBIDs(ArrayDBIDs ids,
                               int k)

Description copied from interface: KNNQuery

Bulk query method

Specified by:

getKNNForBulkDBIDs in interface KNNQuery<O>

Parameters:

ids - query object IDs

k - Number of neighbors requested

Returns:

neighbors

getKNNForObject

public KNNList getKNNForObject(O obj,
                      int k)

Description copied from interface: KNNQuery

Get the k nearest neighbors for a particular id.

Specified by:

getKNNForObject in interface KNNQuery<O>

Parameters:

obj - Query object

k - Number of neighbors requested

Returns:

neighbors

getPreprocessor

public AbstractMaterializeKNNPreprocessor<O> getPreprocessor()

Get the preprocessor instance.

Returns:

preprocessor instance