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package de.lmu.ifi.dbs.elki.datasource;
/*
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.ids.DBIDFactory;
import de.lmu.ifi.dbs.elki.datasource.bundle.MultipleObjectsBundle;
import de.lmu.ifi.dbs.elki.utilities.documentation.Description;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.AbstractParameterizer;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.OptionID;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameterization.Parameterization;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.IntParameter;
/**
* This is a fake datasource that produces a static DBID range only.
*
* This is useful when using e.g. a distance matrix to access external data.
*
* @author Erich Schubert
* @since 0.5.0
*/
@Description("This class generates a sequence of DBIDs to 'load' into a database. This is useful when using an external data matrix, and not requiring access to the actual vectors.")
public class DBIDRangeDatabaseConnection implements DatabaseConnection {
/**
* Begin of interval
*/
int start;
/**
* Number of records to produce
*/
int count;
/**
* Constructor.
*
* @param start Starting ID
* @param count Number of records to produce
*/
public DBIDRangeDatabaseConnection(int start, int count) {
super();
this.start = start;
this.count = count;
}
@Override
public MultipleObjectsBundle loadData() {
MultipleObjectsBundle b = new MultipleObjectsBundle();
b.setDBIDs(DBIDFactory.FACTORY.generateStaticDBIDRange(start, count));
return b;
}
/**
* Parameterization class.
*
* @author Erich Schubert
*
* @apiviz.exclude
*/
public static class Parameterizer extends AbstractParameterizer {
/**
* Parameter for starting ID to generate
*/
public static final OptionID START_ID = new OptionID("idgen.start", "First integer DBID to generate.");
/**
* Parameter for number of IDs to generate
*/
public static final OptionID COUNT_ID = new OptionID("idgen.count", "Number of DBID to generate.");
/**
* Begin of interval
*/
int start;
/**
* Number of records to produce
*/
int count;
@Override
protected void makeOptions(Parameterization config) {
super.makeOptions(config);
IntParameter startp = new IntParameter(START_ID, 0);
if(config.grab(startp)) {
start = startp.intValue();
}
IntParameter countp = new IntParameter(COUNT_ID);
if(config.grab(countp)) {
count = countp.intValue();
}
}
@Override
protected DBIDRangeDatabaseConnection makeInstance() {
return new DBIDRangeDatabaseConnection(start, count);
}
}
}
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