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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) 2012
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.DBIDRef;
import de.lmu.ifi.dbs.elki.database.query.AbstractDataBasedQuery;
import de.lmu.ifi.dbs.elki.database.relation.Relation;
import de.lmu.ifi.dbs.elki.distance.distancevalue.Distance;
/**
* A distance query serves as adapter layer for database and primitive
* distances.
*
* @author Erich Schubert
*
* @param O Input object type
* @param D Distance result type
*/
public abstract class AbstractDistanceQuery<O, D extends Distance<D>> extends AbstractDataBasedQuery<O> implements DistanceQuery<O, D> {
/**
* Constructor.
*
* @param relation Relation to use.
*/
public AbstractDistanceQuery(Relation<? extends O> relation) {
super(relation);
}
/**
* Returns the distance between the two objects specified by their object ids.
*
* @param id1 first object id
* @param id2 second object id
* @return the distance between the two objects specified by their object ids
*/
@Override
public abstract D distance(DBIDRef id1, DBIDRef id2);
/**
* Returns the distance between the two objects specified by their object ids.
*
* @param o1 first object
* @param id2 second object id
* @return the distance between the two objects specified by their object ids
*/
@Override
public abstract D distance(O o1, DBIDRef id2);
/**
* Returns the distance between the two objects specified by their object ids.
*
* @param id1 first object id
* @param o2 second object
* @return the distance between the two objects specified by their object ids
*/
@Override
public abstract D distance(DBIDRef id1, O o2);
/**
* Returns the distance between the two objects specified by their object ids.
*
* @param o1 first object
* @param o2 second object
* @return the distance between the two objects specified by their object ids
*/
@Override
public abstract D distance(O o1, O o2);
@Override
public D getDistanceFactory() {
return getDistanceFunction().getDistanceFactory();
}
/**
* Provides an infinite distance.
*
* @return an infinite distance
*/
@Override
public D infiniteDistance() {
return getDistanceFunction().getDistanceFactory().infiniteDistance();
}
/**
* Provides a null distance.
*
* @return a null distance
*/
@Override
public D nullDistance() {
return getDistanceFunction().getDistanceFactory().nullDistance();
}
/**
* Provides an undefined distance.
*
* @return an undefined distance
*/
@Override
public D undefinedDistance() {
return getDistanceFunction().getDistanceFactory().undefinedDistance();
}
}
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