blob: 932f44eb8d77d9ad0a66e53eeacf98b1f677d024 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
package de.lmu.ifi.dbs.elki.database.query.distance;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2011
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import de.lmu.ifi.dbs.elki.database.ids.DBID;
import de.lmu.ifi.dbs.elki.database.relation.Relation;
import de.lmu.ifi.dbs.elki.distance.distancefunction.DBIDDistanceFunction;
import de.lmu.ifi.dbs.elki.distance.distancevalue.Distance;
/**
* Run a distance query based on DBIDs
*
* @author Erich Schubert
*
* @apiviz.landmark
* @apiviz.uses DBIDDistanceFunction
*
* @param <D> Distance result type.
*/
public class DBIDDistanceQuery<D extends Distance<D>> extends AbstractDatabaseDistanceQuery<DBID, D> {
/**
* The distance function we use.
*/
final protected DBIDDistanceFunction<D> distanceFunction;
/**
* Constructor.
*
* @param relation Database to use.
* @param distanceFunction Our distance function
*/
public DBIDDistanceQuery(Relation<DBID> relation, DBIDDistanceFunction<D> distanceFunction) {
super(relation);
this.distanceFunction = distanceFunction;
}
@Override
public D distance(DBID id1, DBID id2) {
if(id1 == null) {
throw new UnsupportedOperationException("This distance function can only be used for objects stored in the database.");
}
if(id2 == null) {
throw new UnsupportedOperationException("This distance function can only be used for objects stored in the database.");
}
return distanceFunction.distance(id1, id2);
}
@Override
public DBIDDistanceFunction<D> getDistanceFunction() {
return distanceFunction;
}
}
|
