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

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

Type Parameters:

O - relation object type

All Implemented Interfaces:

RKNNSearcher<DBIDRef>

Direct Known Subclasses:

WrappedRKNNDBIDByLookup.Linear
```
public class WrappedRKNNDBIDByLookup<O>
extends java.lang.Object
implements RKNNSearcher<DBIDRef>
```
Find nearest neighbors by querying with the original object.

Since:

0.8.0

Author:

Erich Schubert

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class WrappedRKNNDBIDByLookup.Linear<O>
Linear scan searcher.

Field Summary

Fields
Modifier and Type Field Description

private RKNNSearcher<O> inner
Inner kNN searcher.

private Relation<? extends O> relation
Data relation.

Constructor Summary

Constructors
Modifier Constructor Description

private WrappedRKNNDBIDByLookup(Relation<? extends O> relation, RKNNSearcher<O> inner)
Constructor.

Method Summary

All Methods Static 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.
`static <O> RKNNSearcher<DBIDRef>`	`wrap(Relation<? extends O> relation, RKNNSearcher<O> inner)`	Wrap a query, if not `null`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - relation
```
private Relation<? extends O> relation
```
    Data relation.
  - inner
```
private RKNNSearcher<O> inner
```
    Inner kNN searcher.
- Constructor Detail
  - WrappedRKNNDBIDByLookup
```
private WrappedRKNNDBIDByLookup(Relation<? extends O> relation,
                                RKNNSearcher<O> inner)
```
    Constructor.
    
    Parameters:
    
    relation - data relation
    
    inner - inner kNN searcher
- 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
  - wrap
```
public static <O> RKNNSearcher<DBIDRef> wrap(Relation<? extends O> relation,
                                             RKNNSearcher<O> inner)
```
    Wrap a query, if not null.
    
    Type Parameters:
    
    O - inner data type
    
    Parameters:
    
    relation - Relation to get object from
    
    inner - inner query
    
    Returns:
    
    wrapped query, or null if inner was null