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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.data.type.TypeUtil;
import de.lmu.ifi.dbs.elki.database.Database;
import de.lmu.ifi.dbs.elki.database.UpdatableDatabase;
import de.lmu.ifi.dbs.elki.database.ids.DBID;
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;
/**
* Pseudo-representation that is the object ID itself.
*
* @author Erich Schubert
*/
public class DBIDView extends AbstractHierarchicalResult implements Relation<DBID> {
/**
* The database
*/
private final Database database;
/**
* The ids object
*/
private DBIDs ids;
/**
* Constructor.
*
* @param database
* @param ids
*/
public DBIDView(Database database, DBIDs ids) {
super();
this.database = database;
this.ids = DBIDUtil.makeUnmodifiable(ids);
}
@Override
public Database getDatabase() {
return database;
}
@Override
public DBID get(DBIDRef id) {
assert (ids.contains(id));
return DBIDUtil.deref(id);
}
@Override
public void set(DBIDRef id, DBID val) {
throw new UnsupportedOperationException("DBIDs cannot be changed.");
}
@Override
public void delete(DBIDRef id) {
if (database instanceof UpdatableDatabase) {
((UpdatableDatabase) database).delete(id);
} else {
throw new UnsupportedOperationException("Deletions are not supported.");
}
}
@Override
public SimpleTypeInformation<DBID> getDataTypeInformation() {
return TypeUtil.DBID;
}
@Override
public DBIDs getDBIDs() {
return ids;
}
@Override
public DBIDIter iterDBIDs() {
return ids.iter();
}
/**
* Set the DBIDs of the view.
*
* @param ids IDs to use
*/
public void setDBIDs(DBIDs ids) {
this.ids = DBIDUtil.makeUnmodifiable(ids);
}
@Override
public int size() {
return ids.size();
}
@Override
public String getLongName() {
return "Database IDs";
}
@Override
public String getShortName() {
return "DBID";
}
}
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