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package de.lmu.ifi.dbs.elki.database;
/*
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 java.util.Arrays;
import de.lmu.ifi.dbs.elki.database.ids.DBIDs;
import de.lmu.ifi.dbs.elki.database.relation.DBIDView;
import de.lmu.ifi.dbs.elki.database.relation.ProxyView;
import de.lmu.ifi.dbs.elki.database.relation.Relation;
import de.lmu.ifi.dbs.elki.logging.Logging;
/**
* A proxy database to use e.g. for projections and partitions.
*
* @author Erich Schubert
*/
public class ProxyDatabase extends AbstractDatabase {
/**
* Logger class.
*/
private static final Logging LOG = Logging.getLogger(ProxyDatabase.class);
/**
* Our DBID representation
*/
protected DBIDView idrep;
/**
* Constructor.
*
* @param ids DBIDs to use
*/
public ProxyDatabase(DBIDs ids) {
super();
this.idrep = new DBIDView(this, ids);
this.relations.add(idrep);
this.addChildResult(idrep);
}
/**
* Constructor.
*
* @param ids DBIDs to use
* @param relations Relations to contain
*/
public ProxyDatabase(DBIDs ids, Iterable<Relation<?>> relations) {
super();
this.idrep = new DBIDView(this, ids);
this.relations.add(idrep);
this.addChildResult(idrep);
for (Relation<?> orel : relations) {
Relation<?> relation = ProxyView.wrap(this, ids, orel);
this.relations.add(relation);
this.addChildResult(relation);
}
}
/**
* Constructor.
*
* @param ids DBIDs to use
* @param relations Relations to contain
*/
public ProxyDatabase(DBIDs ids, Relation<?>... relations) {
this(ids, Arrays.asList(relations));
}
/**
* Constructor, proxying all relations of an existing database.
*
* @param ids ids to proxy
* @param database Database to wrap
*/
public ProxyDatabase(DBIDs ids, Database database) {
this(ids, database.getRelations());
}
@Override
public void initialize() {
// Nothing to do - we were initialized on construction time.
}
/**
* Add a new representation.
*
* @param relation Representation to add.
*/
public void addRelation(Relation<?> relation) {
this.relations.add(relation);
}
@Override
protected Logging getLogger() {
return LOG;
}
/**
* Set the DBIDs to use.
*
* @param ids DBIDs to use
*/
public void setDBIDs(DBIDs ids) {
this.idrep.setDBIDs(ids);
// Update relations.
for (Relation<?> orel : this.relations) {
if (orel instanceof ProxyView) {
((ProxyView<?>) orel).setDBIDs(this.idrep.getDBIDs());
}
}
}
}
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