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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) 2014
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.DBIDRange;
import de.lmu.ifi.dbs.elki.database.ids.DBIDRef;
import de.lmu.ifi.dbs.elki.database.ids.DBIDUtil;
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.distancefunction.DBIDRangeDistanceFunction;
/**
* Run a distance query based on DBIDRanges
*
* @author Erich Schubert
*
* @apiviz.landmark
* @apiviz.uses DBIDRangeDistanceFunction
*/
public class DBIDRangeDistanceQuery extends DBIDDistanceQuery {
/**
* The distance function we use.
*/
final protected DBIDRangeDistanceFunction distanceFunction;
/**
* The DBID range we are accessing.
*/
final protected DBIDRange range;
/**
* Constructor.
*
* @param relation Database to use.
* @param distanceFunction Our distance function
*/
public DBIDRangeDistanceQuery(Relation<DBID> relation, DBIDRangeDistanceFunction distanceFunction) {
super(relation, distanceFunction);
this.range = DBIDUtil.assertRange(relation.getDBIDs());
this.distanceFunction = distanceFunction;
}
@Override
public double distance(DBIDRef id1, DBIDRef id2) {
return distanceFunction.distance(range.getOffset(id1), range.getOffset(id2));
}
@Override
public DBIDDistanceFunction getDistanceFunction() {
return distanceFunction;
}
}
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