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281
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1 /* ImageOps -- convenience methods for images
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2
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3 Digital Image Library servlet components
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4
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5 Copyright (C) 2004 Robert Casties (robcast@mail.berlios.de)
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6
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7 This program is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2 of the License, or (at your
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10 option) any later version.
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11
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12 Please read license.txt for the full details. A copy of the GPL
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13 may be found at http://www.gnu.org/copyleft/lgpl.html
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 * Created on 13.10.2004
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20 */
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21 package digilib.image;
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22
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23 import java.io.File;
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24 import java.io.IOException;
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25 import java.io.RandomAccessFile;
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26 import java.util.Iterator;
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27
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28 import javax.imageio.ImageIO;
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29 import javax.imageio.ImageReader;
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30 import javax.imageio.stream.ImageInputStream;
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31
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32 import org.apache.log4j.Logger;
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33 import org.marcoschmidt.image.ImageInfo;
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34
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35 import digilib.io.FileOpException;
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36 import digilib.io.FileOps;
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37 import digilib.io.ImageFile;
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38 import digilib.io.ImageFileset;
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39
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40 /**
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41 * convenience methods for images
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42 *
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43 * @author casties
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44 */
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45 public class ImageOps {
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46
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47 private static Logger logger = Logger.getLogger(ImageOps.class);
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48
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49 /** Check image size and type and store in ImageFile f */
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50 public static boolean checkFile(ImageFile imgf) throws IOException {
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51 // fileset to store the information
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52 ImageFileset imgfs = imgf.getParent();
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53 File f = imgf.getFile();
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54 if (f == null) {
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55 throw new IOException("File not found!");
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56 }
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57 RandomAccessFile raf = new RandomAccessFile(f, "r");
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58 // set up ImageInfo object
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59 ImageInfo iif = new ImageInfo();
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60 iif.setInput(raf);
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61 iif.setCollectComments(false);
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62 iif.setDetermineImageNumber(false);
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63 logger.debug("identifying (ImageInfo) " + f);
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64 // try with ImageInfo first
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65 if (iif.check()) {
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66 ImageSize d = new ImageSize(iif.getWidth(), iif.getHeight());
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67 imgf.setSize(d);
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68 imgf.setMimetype(iif.getMimeType());
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69 //logger.debug(" format:"+iif.getFormatName());
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70 if (imgfs != null) {
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71 imgfs.setAspect(d);
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72 }
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73 raf.close();
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74 iif = null;
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75 } else {
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76 iif = null;
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77 logger.debug("identifying (ImageIO) " + f);
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78 /*
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79 * else use ImageReader
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80 */
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81 ImageInputStream istream = ImageIO.createImageInputStream(raf);
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82 Iterator readers = ImageIO.getImageReaders(istream);
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83 if ((readers == null) || (!readers.hasNext())) {
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84 throw new FileOpException("ERROR: unknown image file format!");
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85 }
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86 ImageReader reader = (ImageReader) readers.next();
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87 /* are there more readers? */
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88 logger.debug("ImageIO: this reader: " + reader.getClass());
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89 while (readers.hasNext()) {
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90 logger.debug("ImageIO: next reader: "
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91 + readers.next().getClass());
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92 }
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93 reader.setInput(istream);
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94 ImageSize d = new ImageSize(reader.getWidth(0), reader.getHeight(0));
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95 imgf.setSize(d);
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96 //String t = reader.getFormatName();
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97 String t = FileOps.mimeForFile(f);
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98 imgf.setMimetype(t);
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99 //logger.debug(" format:"+t);
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100 if (imgfs != null) {
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101 imgfs.setAspect(d);
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102 }
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103 // dispose the reader to free resources
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104 reader.dispose();
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105 raf.close();
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106 reader = null;
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107 }
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108 logger.debug("image size: " + imgf.getSize());
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109 return true;
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110 }
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111
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112 }
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