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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) 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.DBIDIter;
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.ids.DoubleDBIDList;
import de.lmu.ifi.dbs.elki.database.ids.ModifiableDoubleDBIDList;
import de.lmu.ifi.dbs.elki.database.query.LinearScanQuery;
import de.lmu.ifi.dbs.elki.database.query.distance.DistanceQuery;
/**
* Default linear scan range query class.
*
* @author Erich Schubert
*
* @apiviz.landmark
* @apiviz.has DistanceQuery
*
* @param <O> Database object type
*/
public class LinearScanDistanceRangeQuery<O> extends AbstractDistanceRangeQuery<O> implements LinearScanQuery {
/**
* Constructor.
*
* @param distanceQuery Distance function to use
*/
public LinearScanDistanceRangeQuery(DistanceQuery<O> distanceQuery) {
super(distanceQuery);
}
@Override
public DoubleDBIDList getRangeForDBID(DBIDRef id, double range) {
ModifiableDoubleDBIDList result = DBIDUtil.newDistanceDBIDList();
for(DBIDIter iter = relation.getDBIDs().iter(); iter.valid(); iter.advance()) {
final double currentDistance = distanceQuery.distance(id, iter);
if(currentDistance <= range) {
result.add(currentDistance, iter);
}
}
result.sort();
return result;
}
@Override
public DoubleDBIDList getRangeForObject(O obj, double range) {
ModifiableDoubleDBIDList result = DBIDUtil.newDistanceDBIDList();
for(DBIDIter iter = relation.getDBIDs().iter(); iter.valid(); iter.advance()) {
final double currentDistance = distanceQuery.distance(obj, iter);
if(currentDistance <= range) {
result.add(currentDistance, iter);
}
}
result.sort();
return result;
}
@Override
public void getRangeForDBID(DBIDRef id, double range, ModifiableDoubleDBIDList neighbors) {
for(DBIDIter iter = relation.iterDBIDs(); iter.valid(); iter.advance()) {
final double currentDistance = distanceQuery.distance(id, iter);
if(currentDistance <= range) {
neighbors.add(currentDistance, iter);
}
}
}
@Override
public void getRangeForObject(O obj, double range, ModifiableDoubleDBIDList neighbors) {
for(DBIDIter iter = relation.iterDBIDs(); iter.valid(); iter.advance()) {
final double currentDistance = distanceQuery.distance(obj, iter);
if(currentDistance <= range) {
neighbors.add(currentDistance, iter);
}
}
}
}
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