PreprocessorKNNQuery (ELKI: Environment for DeveLoping KDD-Applications Supported by Index-Structures)

java.lang.Object
- elki.database.query.knn.PreprocessorKNNQuery

All Implemented Interfaces:

KNNSearcher<DBIDRef>

Direct Known Subclasses:

PreprocessorSqrtKNNQuery, PreprocessorSquaredKNNQuery
```
public class PreprocessorKNNQuery
extends java.lang.Object
implements KNNSearcher<DBIDRef>
```
Use precomputed kNN.

Since:

0.4.0

Author:

Erich Schubert

Field Summary

Fields
Modifier and Type	Field	Description
`private static Logging`	`LOG`	Class logger
`private AbstractMaterializeKNNPreprocessor<?>`	`preprocessor`	The last preprocessor result
`protected Relation<?>`	`relation`	The data to use for this query
`private boolean`	`warned`	Warn only once.

Constructor Summary

Constructors
Constructor Description

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

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`KNNList`	`getKNN(DBIDRef id, int k)`	Get the k nearest neighbors for a particular object.
`protected Logging`	`getLogger()`	Get the class logger.
`AbstractMaterializeKNNPreprocessor<?>`	`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<?> relation
```
    The data to use for this query
  - preprocessor
```
private final AbstractMaterializeKNNPreprocessor<?> preprocessor
```
    The last preprocessor result
  - warned
```
private boolean warned
```
    Warn only once.
- Constructor Detail
  - PreprocessorKNNQuery
```
public PreprocessorKNNQuery(Relation<?> relation,
                            AbstractMaterializeKNNPreprocessor<?> preprocessor)
```
    Constructor.
    
    Parameters:
    
    relation - Relation to query
    
    preprocessor - Preprocessor instance to use
- Method Detail
  - getKNN
```
public KNNList getKNN(DBIDRef id,
                      int k)
```
    Description copied from interface: KNNSearcher
    
    Get the k nearest neighbors for a particular object.
    
    Specified by:
    
    getKNN in interface KNNSearcher<DBIDRef>
    
    Parameters:
    
    id - query object
    
    k - Number of neighbors requested
    
    Returns:
    
    neighbors
  - getPreprocessor
```
public AbstractMaterializeKNNPreprocessor<?> getPreprocessor()
```
    Get the preprocessor instance.
    
    Returns:
    
    preprocessor instance
  - getLogger
```
protected Logging getLogger()
```
    Get the class logger. Override when subclassing!
    
    Returns:
    
    Class logger.