/*
* 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.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;
import org.graphstream.stream.SourceBase;
import org.graphstream.util.parser.ParseException;
import org.graphstream.util.parser.Parser;
import org.graphstream.util.parser.ParserFactory;
/**
* This defines source using a {@link org.graphstream.util.parser.Parser} object
* to parse a stream and generate graph events.
*
*/
public abstract class FileSourceParser extends SourceBase implements FileSource {
/**
* Factory used to create parser.
*/
protected ParserFactory factory;
/**
* Parser opened by a call to {@link #begin(Reader)}.
*/
protected Parser parser;
/**
* Get a new parser factory.
*
* @return a parser factory
*/
public abstract ParserFactory getNewParserFactory();
protected FileSourceParser() {
factory = getNewParserFactory();
}
/*
* (non-Javadoc)
*
* @see org.graphstream.stream.file.FileSource#readAll(java.lang.String)
*/
public void readAll(String fileName) throws IOException {
Parser parser = factory.newParser(createReaderForFile(fileName));
try {
parser.all();
parser.close();
} catch (ParseException e) {
throw new IOException(e);
}
}
/*
* (non-Javadoc)
*
* @see org.graphstream.stream.file.FileSource#readAll(java.net.URL)
*/
public void readAll(URL url) throws IOException {
Parser parser = factory.newParser(new InputStreamReader(url
.openStream()));
try {
parser.all();
parser.close();
} catch (ParseException e) {
throw new IOException(e);
}
}
/*
* (non-Javadoc)
*
* @see org.graphstream.stream.file.FileSource#readAll(java.io.InputStream)
*/
public void readAll(InputStream stream) throws IOException {
Parser parser = factory.newParser(new InputStreamReader(stream));
try {
parser.all();
parser.close();
} catch (ParseException e) {
throw new IOException(e);
}
}
/*
* (non-Javadoc)
*
* @see org.graphstream.stream.file.FileSource#readAll(java.io.Reader)
*/
public void readAll(Reader reader) throws IOException {
Parser parser = factory.newParser(reader);
try {
parser.all();
parser.close();
} catch (ParseException e) {
throw new IOException(e);
}
}
/*
* (non-Javadoc)
*
* @see org.graphstream.stream.file.FileSource#begin(java.lang.String)
*/
public void begin(String fileName) throws IOException {
if (parser != null)
end();
parser = factory.newParser(createReaderForFile(fileName));
try {
parser.open();
} catch (ParseException e) {
throw new IOException(e);
}
}
/*
* (non-Javadoc)
*
* @see org.graphstream.stream.file.FileSource#begin(java.net.URL)
*/
public void begin(URL url) throws IOException {
parser = factory.newParser(new InputStreamReader(url.openStream()));
try {
parser.open();
} catch (ParseException e) {
throw new IOException(e);
}
}
/*
* (non-Javadoc)
*
* @see org.graphstream.stream.file.FileSource#begin(java.io.InputStream)
*/
public void begin(InputStream stream) throws IOException {
parser = factory.newParser(new InputStreamReader(stream));
try {
parser.open();
} catch (ParseException e) {
throw new IOException(e);
}
}
/*
* (non-Javadoc)
*
* @see org.graphstream.stream.file.FileSource#begin(java.io.Reader)
*/
public void begin(Reader reader) throws IOException {
parser = factory.newParser(reader);
try {
parser.open();
} catch (ParseException e) {
throw new IOException(e);
}
}
/*
* (non-Javadoc)
*
* @see org.graphstream.stream.file.FileSource#nextEvents()
*/
public boolean nextEvents() throws IOException {
try {
return parser.next();
} catch (ParseException e) {
throw new IOException(e);
}
}
/**
* Since there is no step in DOT, this does the same action than
* {@link #nextEvents()}.
*/
public boolean nextStep() throws IOException {
return nextEvents();
}
/*
* (non-Javadoc)
*
* @see org.graphstream.stream.file.FileSource#end()
*/
public void end() throws IOException {
parser.close();
parser = null;
}
protected Reader createReaderForFile(String filename) throws IOException {
return new FileReader(filename);
}
}