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

java.lang.Object
- elki.database.query.rknn.PreprocessorRKNNQuery<O>

All Implemented Interfaces:

RKNNSearcher<DBIDRef>
```
public class PreprocessorRKNNQuery<O>
extends java.lang.Object
implements RKNNSearcher<DBIDRef>
```
Instance for a particular database, invoking the preprocessor.

Since:

0.4.0

Author:

Elke Achtert

Field Summary

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

Constructor Summary

Constructors
Constructor	Description
`PreprocessorRKNNQuery(Relation<O> database, MaterializeKNNAndRKNNPreprocessor.Factory<O> preprocessor)`	Constructor.
`PreprocessorRKNNQuery(Relation<O> relation, MaterializeKNNAndRKNNPreprocessor<O> preprocessor)`	Constructor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`DoubleDBIDList`	`getRKNN(DBIDRef id, int k)`	Get the reverse k nearest neighbors for a particular object.

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 MaterializeKNNAndRKNNPreprocessor<O> preprocessor
```
    The last preprocessor result
  - warned
```
private boolean warned
```
    Warn only once.
- Constructor Detail
  - PreprocessorRKNNQuery
```
public PreprocessorRKNNQuery(Relation<O> relation,
                             MaterializeKNNAndRKNNPreprocessor<O> preprocessor)
```
    Constructor.
    
    Parameters:
    
    relation - Relation to query
    
    preprocessor - Preprocessor instance to use
  - PreprocessorRKNNQuery
```
public PreprocessorRKNNQuery(Relation<O> database,
                             MaterializeKNNAndRKNNPreprocessor.Factory<O> preprocessor)
```
    Constructor.
    
    Parameters:
    
    database - Database to query
    
    preprocessor - Preprocessor to use
- Method Detail
  - getRKNN
```
public DoubleDBIDList getRKNN(DBIDRef id,
                              int k)
```
    Description copied from interface: RKNNSearcher
    
    Get the reverse k nearest neighbors for a particular object.
    
    Specified by:
    
    getRKNN in interface RKNNSearcher<O>
    
    Parameters:
    
    id - query object
    
    k - number of neighbors requested
    
    Returns:
    
    reverse k nearest neighbors