001/*
002 * Copyright (c) 2005 Einar Pehrson <einar@pehrson.nu>.
003 *
004 * This file is part of
005 * CleanSheets - a spreadsheet application for the Java platform.
006 *
007 * CleanSheets is free software; you can redistribute it and/or modify
008 * it under the terms of the GNU General Public License as published by
009 * the Free Software Foundation; either version 2 of the License, or
010 * (at your option) any later version.
011 *
012 * CleanSheets is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
015 * GNU General Public License for more details.
016 *
017 * You should have received a copy of the GNU General Public License
018 * along with CleanSheets; if not, write to the Free Software
019 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
020 */
021package csheets.io;
022
023import java.io.File;
024
025/**
026 * A factory for codecs.
027 * @author Einar Pehrson
028 */
029public class CodecFactory {
030
031        /**
032         * Creates a new codec factory.
033         */
034        public CodecFactory() {}
035
036        /**
037         * Returns the appropriate codec for the given file.
038         * @param file the file to use
039         * @return the appropriate codec, or null if none could be found
040         */
041        public Codec getCodec(File file) {
042                String filename = file.getName();
043                String extension = filename.substring(filename.lastIndexOf('.') + 1).toLowerCase().trim();
044                return getCodec(extension);
045        }
046
047        /**
048         * Returns the appropriate codec for the given filename extension.
049         * @param extension the filename extension of the file to use
050         * @return the appropriate codec, or null if none could be found
051         */
052        public Codec getCodec(String extension) {
053                // Builds the class name
054                String className = this.getClass().getPackage().getName()
055                        + "." + extension.toUpperCase() + "Codec";
056
057                // Fetches the class and instantiates the codec
058                Codec codec = null;
059                try {
060                        Class codecClass = Class.forName(className);
061                        codec = (Codec)codecClass.newInstance();
062                } catch (Exception e) {
063                        return null;
064                }
065
066                return codec;
067        }
068}