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 java.lang.Object
implements KNNQuery<O>

Instance for a particular database, invoking the preprocessor.

Since:

0.4.0

Author:

Erich Schubert

Field Summary

Fields

Modifier and Type	Field and Description
private static Logging	LOG Class logger
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<? extends O> relation, AbstractMaterializeKNNPreprocessor<O> preprocessor) Constructor.

Method Summary

Modifier and Type	Method and Description
java.util.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.
protected Logging	getLogger() Get the class logger.
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

LOG

private static final Logging LOG

Class logger

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<? extends 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 java.util.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

getLogger

protected Logging getLogger()

Get the class logger. Override when subclassing!

Returns:

Class logger.