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package de.lmu.ifi.dbs.elki.database.datastore.memory;
import java.util.Arrays;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2015
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.datastore.DataStoreIDMap;
import de.lmu.ifi.dbs.elki.database.datastore.WritableDataStore;
import de.lmu.ifi.dbs.elki.database.ids.DBIDRef;
import de.lmu.ifi.dbs.elki.database.ids.DBIDUtil;
import de.lmu.ifi.dbs.elki.utilities.exceptions.ObjectNotFoundException;
/**
* A class to answer representation queries using the stored Array.
*
* @author Erich Schubert
* @since 0.4.0
*
* @apiviz.composedOf de.lmu.ifi.dbs.elki.database.datastore.DataStoreIDMap
*
* @param <T> Representation object typ
*/
public class ArrayStore<T> implements WritableDataStore<T> {
/**
* Data array.
*/
private Object[] data;
/**
* DBID to index map.
*/
private DataStoreIDMap idmap;
/**
* Constructor.
*
* @param data Data array
* @param idmap DBID to offset mapping
*/
public ArrayStore(Object[] data, DataStoreIDMap idmap) {
super();
this.data = data;
this.idmap = idmap;
}
@SuppressWarnings("unchecked")
@Override
public T get(DBIDRef id) {
final int off = idmap.mapDBIDToOffset(id);
if(off < 0 || off >= data.length) {
throw new ObjectNotFoundException(DBIDUtil.deref(id));
}
return (T) data[off];
}
@Override
public T put(DBIDRef id, T value) {
T ret = get(id);
data[idmap.mapDBIDToOffset(id)] = value;
return ret;
}
@Override
public void destroy() {
data = null;
idmap = null;
}
@Override
public void delete(DBIDRef id) {
put(id, null);
}
@Override
public void clear() {
Arrays.fill(data, null);
}
@Override
public String getLongName() {
return "raw";
}
@Override
public String getShortName() {
return "raw";
}
}
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