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package de.lmu.ifi.dbs.elki.database.datastore.memory;
/*
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.Map;
import java.util.concurrent.ConcurrentHashMap;
import de.lmu.ifi.dbs.elki.database.datastore.WritableDataStore;
import de.lmu.ifi.dbs.elki.database.datastore.WritableRecordStore;
import de.lmu.ifi.dbs.elki.database.ids.DBID;
import de.lmu.ifi.dbs.elki.database.ids.DBIDRef;
import de.lmu.ifi.dbs.elki.database.ids.DBIDUtil;
/**
* A class to answer representation queries using a map and an index within the
* record.
*
* @author Erich Schubert
*
* @apiviz.has MapRecordStore.StorageAccessor oneway - - projectsTo
*/
public class MapRecordStore implements WritableRecordStore {
/**
* Record length.
*/
private final int rlen;
/**
* Storage Map.
*/
// TODO: Use trove maps?
private final Map<DBID, Object[]> data;
/**
* Constructor with existing data.
*
* @param rlen Number of columns (record length)
* @param data Existing data map
*/
public MapRecordStore(int rlen, Map<DBID, Object[]> data) {
super();
this.rlen = rlen;
this.data = data;
}
/**
* Constructor without existing data.
*
* @param rlen Number of columns (record length)
*/
public MapRecordStore(int rlen) {
this(rlen, new ConcurrentHashMap<DBID, Object[]>());
}
@Override
public <T> WritableDataStore<T> getStorage(int col, Class<? super T> datatype) {
// TODO: add type checking?
return new StorageAccessor<>(col);
}
/**
* Actual getter.
*
* @param id Database ID
* @param index column index
* @param <T> type
* @return current value
*/
@SuppressWarnings("unchecked")
protected <T> T get(DBIDRef id, int index) {
Object[] d = data.get(DBIDUtil.deref(id));
if (d == null) {
return null;
}
return (T) d[index];
}
/**
* Actual setter.
*
* @param id Database ID
* @param index column index
* @param value new value
* @param <T> type
* @return previous value
*/
@SuppressWarnings("unchecked")
protected <T> T set(DBIDRef id, int index, T value) {
Object[] d = data.get(DBIDUtil.deref(id));
if (d == null) {
d = new Object[rlen];
data.put(DBIDUtil.deref(id), d);
}
T ret = (T) d[index];
d[index] = value;
return ret;
}
/**
* Access a single record in the given data.
*
* @author Erich Schubert
*
* @param <T> Object data type to access
*/
protected class StorageAccessor<T> implements WritableDataStore<T> {
/**
* Representation index.
*/
private final int index;
/**
* Constructor.
*
* @param index In-record index
*/
protected StorageAccessor(int index) {
super();
this.index = index;
}
@SuppressWarnings("unchecked")
@Override
public T get(DBIDRef id) {
return (T) MapRecordStore.this.get(id, index);
}
@Override
public T put(DBIDRef id, T value) {
return MapRecordStore.this.set(id, index, value);
}
@Override
public void destroy() {
throw new UnsupportedOperationException("Record storage accessors cannot be destroyed.");
}
@Override
public void delete(DBIDRef id) {
throw new UnsupportedOperationException("Record storage values cannot be deleted.");
}
@Override
public String getLongName() {
return "raw";
}
@Override
public String getShortName() {
return "raw";
}
}
@Override
public boolean remove(DBIDRef id) {
return data.remove(id) != null;
}
}
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