/*
* Copyright 2006 - 2013
* Stefan Balev <stefan.balev@graphstream-project.org>
* Julien Baudry <julien.baudry@graphstream-project.org>
* Antoine Dutot <antoine.dutot@graphstream-project.org>
* Yoann Pigné <yoann.pigne@graphstream-project.org>
* Guilhelm Savin <guilhelm.savin@graphstream-project.org>
*
* This file is part of GraphStream <http://graphstream-project.org>.
*
* GraphStream is a library whose purpose is to handle static or dynamic
* graph, create them from scratch, file or any source and display them.
*
* This program is free software distributed under the terms of two licenses, the
* CeCILL-C license that fits European law, and the GNU Lesser General Public
* License. You can use, modify and/ or redistribute the software under the terms
* of the CeCILL-C license as circulated by CEA, CNRS and INRIA at the following
* URL <http://www.cecill.info> or under the terms of the GNU LGPL 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* The fact that you are presently reading this means that you have had
* knowledge of the CeCILL-C and LGPL licenses and that you accept their terms.
*/
package org.graphstream.stream.file;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.zip.GZIPInputStream;
import org.graphstream.stream.file.dgs.DGSParser;
import org.graphstream.util.parser.ParseException;
import org.graphstream.util.parser.Parser;
import org.graphstream.util.parser.ParserFactory;
/**
* Class responsible for parsing files in the DGS format.
*
* <p>
* The DGS file format is especially designed for storing dynamic graph
* definitions into a file. More information about the DGS file format will be
* found on the GraphStream web site: <a
* href="http://graphstream-project.org/">http://graphstream-project.org/</a>
* </p>
*
* The usual file name extension used for this format is ".dgs".
*
* @see FileSource
*/
public class FileSourceDGS extends FileSourceParser {
/*
* (non-Javadoc)
*
* @see org.graphstream.stream.file.FileSourceParser#getNewParserFactory()
*/
public ParserFactory getNewParserFactory() {
return new ParserFactory() {
public Parser newParser(Reader reader) {
return new DGSParser(FileSourceDGS.this, reader);
}
};
}
@Override
public boolean nextStep() throws IOException {
try {
return ((DGSParser) parser).nextStep();
} catch (ParseException e) {
throw new IOException(e);
}
}
@Override
protected Reader createReaderForFile(String filename) throws IOException {
InputStream is = null;
is = new FileInputStream(filename);
if (is.markSupported())
is.mark(128);
try {
is = new GZIPInputStream(is);
} catch (IOException e1) {
//
// This is not a gzip input.
// But gzip has eat some bytes so we reset the stream
// or close and open it again.
//
if (is.markSupported()) {
try {
is.reset();
} catch (IOException e2) {
//
// Dirty but we hope do not get there
//
e2.printStackTrace();
}
} else {
try {
is.close();
} catch (IOException e2) {
//
// Dirty but we hope do not get there
//
e2.printStackTrace();
}
is = new FileInputStream(filename);
}
}
return new BufferedReader(new InputStreamReader(is));
}
}