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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) 2015
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.ids.DBIDRef;
import de.lmu.ifi.dbs.elki.database.relation.Relation;
import de.lmu.ifi.dbs.elki.distance.distancefunction.DBIDDistanceFunction;
/**
* Run a distance query based on DBIDs
*
* @author Erich Schubert
*
* @apiviz.landmark
* @apiviz.uses DBIDDistanceFunction
*/
public class DBIDDistanceQuery extends AbstractDatabaseDistanceQuery<DBID> {
/**
* The distance function we use.
*/
final protected DBIDDistanceFunction distanceFunction;
/**
* Constructor.
*
* @param relation Database to use.
* @param distanceFunction Our distance function
*/
public DBIDDistanceQuery(Relation<DBID> relation, DBIDDistanceFunction distanceFunction) {
super(relation);
this.distanceFunction = distanceFunction;
}
@Override
public double distance(DBIDRef id1, DBIDRef 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 getDistanceFunction() {
return distanceFunction;
}
}
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