Java tutorial
/* * regain/Thumbnailer - A file search engine providing plenty of formats (Plugin) * Copyright (C) 2011 Come_IN Computerclubs (University of Siegen) * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Contact: Come_IN-Team <come_in-team@listserv.uni-siegen.de> */ package de.uni_siegen.wineme.come_in.thumbnailer; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import org.apache.commons.cli.CommandLine; import org.apache.commons.cli.CommandLineParser; import org.apache.commons.cli.GnuParser; import org.apache.commons.cli.HelpFormatter; import org.apache.commons.cli.OptionBuilder; import org.apache.commons.cli.Options; import org.apache.commons.cli.ParseException; import org.apache.commons.io.FileUtils; import org.apache.commons.io.IOUtils; import org.apache.log4j.Logger; import org.apache.log4j.PropertyConfigurator; import de.uni_siegen.wineme.come_in.thumbnailer.thumbnailers.JODExcelConverterThumbnailer; import de.uni_siegen.wineme.come_in.thumbnailer.thumbnailers.JODHtmlConverterThumbnailer; import de.uni_siegen.wineme.come_in.thumbnailer.thumbnailers.JODPowerpointConverterThumbnailer; import de.uni_siegen.wineme.come_in.thumbnailer.thumbnailers.JODWordConverterThumbnailer; import de.uni_siegen.wineme.come_in.thumbnailer.thumbnailers.NativeImageThumbnailer; import de.uni_siegen.wineme.come_in.thumbnailer.thumbnailers.OpenOfficeThumbnailer; import de.uni_siegen.wineme.come_in.thumbnailer.thumbnailers.PDFBoxThumbnailer; import de.uni_siegen.wineme.come_in.thumbnailer.thumbnailers.ScratchThumbnailer; /** * Little Command-line Application to illustrate the usage of this library. * * @author Benjamin * @needs Commons-cli (included in jodconverter) */ public class Main { protected static Logger mLog = Logger.getLogger(Main.class); private static Options options; private static ThumbnailerManager thumbnailer; private static File outFile; private static File inFile; private static final String LOG4J_CONFIG_FILE = "conf/javathumbnailer.log4j.properties"; public static void main(String[] params) throws Exception { if (params.length == 0) { explainUsage(); System.exit(-1); } initLogging(); thumbnailer = new ThumbnailerManager(); loadExistingThumbnailers(); // Set Default Values thumbnailer.setImageSize(160, 120, 0); thumbnailer.setThumbnailFolder("thumbs/"); initParams(); parseParams(params); if (outFile == null) outFile = thumbnailer.createThumbnail(inFile); else thumbnailer.generateThumbnail(inFile, outFile); System.out.println("SUCCESS: Thumbnail created:\n" + outFile.getAbsolutePath()); } private static void initParams() { options = new Options(); options.addOption(OptionBuilder.withArgName("WIDTHxHEIGHT").hasArg() .withDescription("Size of the new thumbnail (default: 160x120)").create("size")); } private static void parseParams(String[] params) { CommandLineParser parser = new GnuParser(); CommandLine line = null; try { line = parser.parse(options, params); } catch (ParseException e) { System.err.println("Invalid command line: " + e.getMessage()); explainUsage(); System.exit(1); } if (line.hasOption("size")) { // TODO Set } String[] files = line.getArgs(); if (files.length == 0 || files.length > 2) { explainUsage(); System.exit(1); } inFile = new File(files[0]); if (files.length > 1) outFile = new File(files[1]); } private static void explainUsage() { System.out.println("JavaThumbnailer"); System.out.println("==============="); System.out.println(""); System.out .println("Usage: java -jar javathumbnailer-standalone.jar [-size 160x120] inputfile [outputfile]"); HelpFormatter formatter = new HelpFormatter(); formatter.printHelp("java -jar javathumbnailer-standalone.jar", options); } protected static void loadExistingThumbnailers() { if (classExists("de.uni_siegen.wineme.come_in.thumbnailer.thumbnailers.NativeImageThumbnailer")) thumbnailer.registerThumbnailer(new NativeImageThumbnailer()); thumbnailer.registerThumbnailer(new OpenOfficeThumbnailer()); thumbnailer.registerThumbnailer(new PDFBoxThumbnailer()); try { thumbnailer.registerThumbnailer(new JODWordConverterThumbnailer()); thumbnailer.registerThumbnailer(new JODExcelConverterThumbnailer()); thumbnailer.registerThumbnailer(new JODPowerpointConverterThumbnailer()); thumbnailer.registerThumbnailer(new JODHtmlConverterThumbnailer()); } catch (IOException e) { mLog.error("Could not initialize JODConverter:", e); } thumbnailer.registerThumbnailer(new ScratchThumbnailer()); } protected static void initLogging() throws IOException { System.setProperty("log4j.configuration", LOG4J_CONFIG_FILE); File logConfigFile = new File(LOG4J_CONFIG_FILE); if (!logConfigFile.exists()) { // Extract config properties from jar InputStream in = Main.class.getResourceAsStream("/" + LOG4J_CONFIG_FILE); if (in == null) { System.err.println( "Packaging error: can't find logging configuration inside jar. (Neither can I find the config file on the file system: " + logConfigFile.getAbsolutePath() + ")"); System.exit(1); } OutputStream out = null; try { out = FileUtils.openOutputStream(logConfigFile); IOUtils.copy(in, out); } finally { try { if (in != null) in.close(); } finally { if (out != null) out.close(); } } } PropertyConfigurator.configureAndWatch(logConfigFile.getAbsolutePath(), 10 * 1000); mLog.info("Logging initialized"); } public static boolean classExists(String qualifiedClassname) { try { Class.forName(qualifiedClassname); } catch (ClassNotFoundException e) { return false; } return true; } }