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package de.lmu.ifi.dbs.elki.database.query.range;
/*
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 java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import de.lmu.ifi.dbs.elki.database.ids.DBID;
import de.lmu.ifi.dbs.elki.database.query.DistanceResultPair;
import de.lmu.ifi.dbs.elki.database.query.GenericDistanceResultPair;
import de.lmu.ifi.dbs.elki.database.query.LinearScanQuery;
import de.lmu.ifi.dbs.elki.database.query.distance.DistanceQuery;
import de.lmu.ifi.dbs.elki.distance.distancevalue.Distance;
/**
* Default linear scan range query class.
*
* @author Erich Schubert
*
* @apiviz.landmark
* @apiviz.has DistanceQuery
*
* @param <O> Database object type
* @param <D> Distance type
*/
public class LinearScanRangeQuery<O, D extends Distance<D>> extends AbstractDistanceRangeQuery<O, D> implements LinearScanQuery {
/**
* Constructor.
*
* @param distanceQuery Distance function to use
*/
public LinearScanRangeQuery(DistanceQuery<O, D> distanceQuery) {
super(distanceQuery);
}
@Override
public List<DistanceResultPair<D>> getRangeForDBID(DBID id, D range) {
List<DistanceResultPair<D>> result = new ArrayList<DistanceResultPair<D>>();
for(DBID currentID : relation.iterDBIDs()) {
D currentDistance = distanceQuery.distance(id, currentID);
if(currentDistance.compareTo(range) <= 0) {
result.add(new GenericDistanceResultPair<D>(currentDistance, currentID));
}
}
Collections.sort(result);
return result;
}
@Override
public List<DistanceResultPair<D>> getRangeForObject(O obj, D range) {
List<DistanceResultPair<D>> result = new ArrayList<DistanceResultPair<D>>();
for(DBID currentID : relation.iterDBIDs()) {
D currentDistance = distanceQuery.distance(currentID, obj);
if(currentDistance.compareTo(range) <= 0) {
result.add(new GenericDistanceResultPair<D>(currentDistance, currentID));
}
}
Collections.sort(result);
return result;
}
}
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