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package de.lmu.ifi.dbs.elki.database.query.similarity;
/*
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 de.lmu.ifi.dbs.elki.database.ids.DBID;
import de.lmu.ifi.dbs.elki.database.query.DatabaseQuery;
import de.lmu.ifi.dbs.elki.database.relation.Relation;
import de.lmu.ifi.dbs.elki.distance.distancevalue.Distance;
/**
* A similarity query serves as adapter layer for database and primitive
* similarity functions.
*
* @author Erich Schubert
*
* @apiviz.landmark
* @apiviz.has Distance
*
* @param O Input object type
* @param D Distance result type
*/
public interface SimilarityQuery<O, D extends Distance<?>> extends DatabaseQuery {
/**
* Returns the similarity between the two objects specified by their object
* ids.
*
* @param id1 first object id
* @param id2 second object id
* @return the similarity between the two objects specified by their object
* ids
*/
public abstract D similarity(DBID id1, DBID id2);
/**
* Returns the similarity between the two objects specified by their object
* ids.
*
* @param o1 first object
* @param id2 second object id
* @return the similarity between the two objects specified by their object
* ids
*/
public abstract D similarity(O o1, DBID id2);
/**
* Returns the similarity between the two objects specified by their object
* ids.
*
* @param id1 first object id
* @param o2 second object
* @return the similarity between the two objects specified by their object
* ids
*/
public abstract D similarity(DBID id1, O o2);
/**
* Returns the similarity between the two objects specified by their object
* ids.
*
* @param o1 first object
* @param o2 second object
* @return the similarity between the two objects specified by their object
* ids
*/
public abstract D similarity(O o1, O o2);
/**
* Method to get the distance functions factory.
*
* @return Factory for distance objects
*/
public abstract D getDistanceFactory();
/**
* Access the underlying data query.
*
* @return data query in use
*/
public abstract Relation<? extends O> getRelation();
}
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