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package de.lmu.ifi.dbs.elki.database.relation;
import de.lmu.ifi.dbs.elki.data.projection.Projection;
import de.lmu.ifi.dbs.elki.data.type.SimpleTypeInformation;
import de.lmu.ifi.dbs.elki.database.Database;
import de.lmu.ifi.dbs.elki.database.ids.DBID;
import de.lmu.ifi.dbs.elki.database.ids.DBIDs;
import de.lmu.ifi.dbs.elki.result.AbstractHierarchicalResult;
import de.lmu.ifi.dbs.elki.utilities.iterator.IterableIterator;
/*
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/>.
*/
/**
* Projected relation view (non-materialized)
*
* @author Erich Schubert
*
* @param <IN> Vector type
* @param <OUT> Vector type
*/
public class ProjectedView<IN, OUT> extends AbstractHierarchicalResult implements Relation<OUT> {
/**
* The wrapped representation where we get the IDs from.
*/
private final Relation<IN> inner;
/**
* The projection we use.
*/
private Projection<IN, OUT> projection;
/**
* Constructor.
*
* @param inner Inner relation
* @param projection Projection function
*/
public ProjectedView(Relation<IN> inner, Projection<IN, OUT> projection) {
super();
this.inner = inner;
this.projection = projection;
}
@Override
public String getLongName() {
return "projection";
}
@Override
public String getShortName() {
return "projection";
}
@Override
public Database getDatabase() {
return inner.getDatabase();
}
@Override
public OUT get(DBID id) {
return projection.project(inner.get(id));
}
@Override
public void set(DBID id, OUT val) {
throw new UnsupportedOperationException("Projections are read-only.");
}
@Override
public void delete(DBID id) {
inner.delete(id);
}
@Override
public SimpleTypeInformation<OUT> getDataTypeInformation() {
return projection.getOutputDataTypeInformation();
}
@Override
public DBIDs getDBIDs() {
return inner.getDBIDs();
}
@Override
public IterableIterator<DBID> iterDBIDs() {
return inner.iterDBIDs();
}
@Override
public int size() {
return inner.size();
}
}
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