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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 java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;
import java.util.List;
import de.lmu.ifi.dbs.elki.datasource.bundle.BundleReader;
import de.lmu.ifi.dbs.elki.datasource.bundle.MultipleObjectsBundle;
import de.lmu.ifi.dbs.elki.datasource.filter.ObjectFilter;
import de.lmu.ifi.dbs.elki.logging.Logging;
import de.lmu.ifi.dbs.elki.utilities.exceptions.AbortException;
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.FileParameter;
/**
* Class to load a database from a bundle file.
*
* Bundle files are stored in a compact binary format along with metadata, so
* that parsing should be simpler, albeit the focus was on using it in on-disk
* indexes.
*
* @author Erich Schubert
* @since 0.5.5
*
* @apiviz.composedOf BundleReader
*/
public class BundleDatabaseConnection extends AbstractDatabaseConnection {
/**
* Class logger.
*/
private static final Logging LOG = Logging.getLogger(BundleDatabaseConnection.class);
/**
* File to load.
*/
private File infile;
/**
* Constructor.
*
* @param filters Filters
* @param infile Input file
*/
public BundleDatabaseConnection(List<ObjectFilter> filters, File infile) {
super(filters);
this.infile = infile;
}
@Override
public MultipleObjectsBundle loadData() {
try {
FileInputStream fis = new FileInputStream(infile);
FileChannel channel = fis.getChannel();
MultipleObjectsBundle bundle = invokeStreamFilters(new BundleReader(channel)).asMultipleObjectsBundle();
channel.close();
fis.close();
return bundle;
}
catch(IOException e) {
throw new AbortException("IO error loading bundle", e);
}
}
@Override
protected Logging getLogger() {
return LOG;
}
/**
* Parameterization class.
*
* @author Erich Schubert
*
* @apiviz.exclude
*/
public static class Parameterizer extends AbstractDatabaseConnection.Parameterizer {
/**
* Option ID for the bundle parameter.
*/
private static final OptionID BUNDLE_ID = new OptionID("bundle.input", "Bundle file to load the data from.");
/**
* File to load.
*/
private File infile;
@Override
protected void makeOptions(Parameterization config) {
super.makeOptions(config);
configFilters(config);
FileParameter infileP = new FileParameter(BUNDLE_ID, FileParameter.FileType.INPUT_FILE);
if(config.grab(infileP)) {
infile = infileP.getValue();
}
}
@Override
protected BundleDatabaseConnection makeInstance() {
return new BundleDatabaseConnection(filters, infile);
}
}
}
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