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     */
021    package csheets.io;
022    
023    import java.io.File;
024    
025    /**
026     * A factory for codecs.
027     * @author Einar Pehrson
028     */
029    public 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    }