/*  PGNFileFilter - A file filter for PGN files.  Copyright (C) 2003 The Java-Chess team <info@java-chess.de>  This program is free software; you can redistribute it and/or  modify it under the terms of the GNU General Public License  as published by the Free Software Foundation; either version 2  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 General Public License for more details.  You should have received a copy of the GNU General Public License  along with this program; if not, write to the Free Software  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.*/package de.java_chess.javaChess.pgn;import javax.swing.filechooser.FileFilter;import java.io.File;/** * A file filter for PGN files. */public class PGNFileFilter extends FileFilter {    // Instance variables    // Constructors    // Methods    /**     * Check if the given file is a PGN file.     *     * @param file The file to check.     *     * @return true, if the file is a PGN file, false otherwise.     */    public boolean accept( File file) {	if (file == null) {	    return false;	}	String filename = file.getName();	int i = filename.lastIndexOf('.');	if (i > 0 &&  i < filename.length() - 1) {	    return "pgn".equalsIgnoreCase( filename.substring( i + 1).toLowerCase());	}	return false;          }    /**     * Get a description of this file filter.     *     * @return A description of this file filter.     */    public String getDescription() {	return "PGN - Portable Game Notation format";    }}