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package de.lmu.ifi.dbs.elki.database.relation;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2013
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.data.type.SimpleTypeInformation;
import de.lmu.ifi.dbs.elki.database.Database;
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.DBIDs;
import de.lmu.ifi.dbs.elki.result.AbstractHierarchicalResult;
/**
* A virtual partitioning of the database. For the accepted DBIDs, access is
* passed on to the wrapped representation.
*
* @author Erich Schubert
*
* @param <O> Object type
*/
public class ProxyView<O> extends AbstractHierarchicalResult implements Relation<O> {
/**
* Our database
*/
private final Database database;
/**
* The DBIDs we contain
*/
private DBIDs idview;
/**
* The wrapped representation where we get the IDs from.
*/
private final Relation<O> inner;
/**
* Constructor.
*
* @param idview Ids to expose
* @param inner Inner representation
*/
public ProxyView(Database database, DBIDs idview, Relation<O> inner) {
super();
this.database = database;
this.idview = DBIDUtil.makeUnmodifiable(idview);
this.inner = inner;
}
@Override
public Database getDatabase() {
return database;
}
/**
* Constructor-like static method.
*
* @param <O> Object type
* @param idview Ids to expose
* @param inner Inner representation
* @return Instance
*/
public static <O> ProxyView<O> wrap(Database database, DBIDs idview, Relation<O> inner) {
return new ProxyView<>(database, idview, inner);
}
@Override
public O get(DBIDRef id) {
assert (idview.contains(id)) : "Accessing object not included in view.";
return inner.get(id);
}
@Override
public void set(DBIDRef id, O val) {
assert (idview.contains(id)) : "Accessing object not included in view.";
inner.set(id, val);
}
@Override
public void delete(DBIDRef id) {
throw new UnsupportedOperationException("Semantics of 'delete-from-virtual-partition' are not uniquely defined. Delete from IDs or from underlying data, please!");
}
@Override
public DBIDs getDBIDs() {
return idview;
}
@Override
public DBIDIter iterDBIDs() {
return idview.iter();
}
@Override
public int size() {
return idview.size();
}
@Override
public SimpleTypeInformation<O> getDataTypeInformation() {
return inner.getDataTypeInformation();
}
@Override
public String getLongName() {
return "Partition of " + inner.getLongName();
}
@Override
public String getShortName() {
return "partition";
}
/**
* Set the DBIDs to use.
*
* @param ids DBIDs
*/
public void setDBIDs(DBIDs ids) {
this.idview = ids;
}
}
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