/*
 * 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. 
 */

/**
 * @since 2009-05-09
 * 
 * @author Yoann Pigné <yoann.pigne@graphstream-project.org>
 * @author Antoine Dutot <antoine.dutot@graphstream-project.org>
 * @author Guilhelm Savin <guilhelm.savin@graphstream-project.org>
 * @author Hicham Brahimi <hicham.brahimi@graphstream-project.org>
 */
package org.graphstream.stream.file;

import java.util.concurrent. ConcurrentHashMap;

/**
 * Try to instantiate the correct writer given a graph filename. 
 * 
 * <p>
 * This class tries to instantiate a writer given a filename.  Actually it purely
 * tries to analyze the extension and propose the writer according to this
 * extension. 
 * </p>
 */
public class FileSinkFactory {
	private static final ConcurrentHashMap<String, Class<?  extends FileSink>> ext2sink;

	static {
		ext2sink = new ConcurrentHashMap<String, Class<?  extends FileSink>>();

		ext2sink.put("dgs", FileSinkDGS.class);
		ext2sink.put("dgsz", FileSinkDGS.class);
		ext2sink.put("dgml", FileSinkDynamicGML.class);
		ext2sink.put("gml", FileSinkGML.class);
		ext2sink.put("graphml", FileSinkGraphML.class);
		ext2sink.put("dot", FileSinkDOT.class);
		ext2sink.put("svg", FileSinkSVG.class);
		ext2sink.put("pgf", FileSinkTikZ.class);
		ext2sink.put("tikz", FileSinkTikZ.class);
		ext2sink.put("tex", FileSinkTikZ.class);
		ext2sink.put("gexf", FileSinkGEXF.class);
		ext2sink.put("xml", FileSinkGEXF.class);
		ext2sink.put("png", FileSinkImages.class);
		ext2sink.put("jpg", FileSinkImages.class);
	}

	/**
	 * Looks at the file name given and its extension and propose a file output for
	 * the format that match this extension. 
	 * 
	 * @param filename
	 *            The file name where the graph will be written. 
	 * @return A file sink or null. 
	 */
	public static FileSink sinkFor(String filename) {
		if (filename.lastIndexOf('.')  > 0) {
			String ext = filename.substring(filename.lastIndexOf('.')  + 1);
			ext = ext.toLowerCase();

			if (ext2sink.containsKey(ext)) {
				Class<?  extends FileSink> fsink = ext2sink.get(ext);

				try {
					return fsink.newInstance();
				} catch (InstantiationException e) {
					e.printStackTrace();
				} catch (IllegalAccessException e) {
					e.printStackTrace();
				}
			}
		}

		return null;
	}
}