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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) 2011
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.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import de.lmu.ifi.dbs.elki.datasource.filter.ObjectFilter;
import de.lmu.ifi.dbs.elki.datasource.parser.Parser;
import de.lmu.ifi.dbs.elki.utilities.FileUtil;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.OptionID;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.WrongParameterValueException;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameterization.Parameterization;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.FileParameter;
/**
* Provides a file based database connection based on the parser to be set.
*
* @author Arthur Zimek
*
* @apiviz.landmark
*/
public class FileBasedDatabaseConnection extends InputStreamDatabaseConnection {
/**
* Parameter that specifies the name of the input file to be parsed.
* <p>
* Key: {@code -dbc.in}
* </p>
*/
public static final OptionID INPUT_ID = OptionID.getOrCreateOptionID("dbc.in", "The name of the input file to be parsed.");
/**
* Constructor.
*
* @param filters Filters, can be null
* @param parser the parser to provide a database
* @param in the input stream to parse from.
*/
public FileBasedDatabaseConnection(List<ObjectFilter> filters, Parser parser, InputStream in) {
super(filters, parser);
this.in = in;
}
/**
* Parameterization class.
*
* @author Erich Schubert
*
* @apiviz.exclude
*/
public static class Parameterizer extends InputStreamDatabaseConnection.Parameterizer {
protected InputStream inputStream;
@Override
protected void makeOptions(Parameterization config) {
// Add the input file first, for usability reasons.
final FileParameter inputParam = new FileParameter(INPUT_ID, FileParameter.FileType.INPUT_FILE);
if(config.grab(inputParam)) {
try {
inputStream = new FileInputStream(inputParam.getValue());
inputStream = FileUtil.tryGzipInput(inputStream);
}
catch(IOException e) {
config.reportError(new WrongParameterValueException(inputParam, inputParam.getValue().getPath(), e));
inputStream = null;
}
}
super.makeOptions(config);
}
@Override
protected FileBasedDatabaseConnection makeInstance() {
return new FileBasedDatabaseConnection(filters, parser, inputStream);
}
}
}
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