Mercurial > hg > digilib-old
annotate servlet/src/digilib/io/ImageFileset.java @ 246:aaf6eace011d
Servlet version 1.19b4
- bug fixes
- new stuff in DocumentBean
| author | robcast |
|---|---|
| date | Wed, 04 Aug 2004 20:42:48 +0200 |
| parents | e40d8b2e3978 |
| children | beed92ee6022 |
| rev | line source |
|---|---|
| 176 | 1 /* ImageFileset -- digilib image file info class. |
| 2 * Digital Image Library servlet components | |
| 3 * Copyright (C) 2003 Robert Casties (robcast@mail.berlios.de) | |
| 4 * | |
| 5 * This program is free software; you can | |
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6 * redistribute it and/or modify it under the terms of the GNU General Public |
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7 * License as published by the Free Software Foundation; either version 2 of |
| 176 | 8 * the License, or (at your option) any later version. |
| 9 * | |
| 10 * Please read license.txt for the full details. A copy of the GPL may be | |
| 11 * found at http://www.gnu.org/copyleft/lgpl.html | |
| 12 * | |
| 13 * You should have received a copy of the GNU General Public License along | |
| 14 * with this program; if not, write to the Free Software Foundation, Inc., | |
| 15 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 159 | 16 */ |
| 176 | 17 |
| 159 | 18 package digilib.io; |
| 19 | |
| 20 import java.io.File; | |
| 21 import java.io.IOException; | |
| 22 import java.util.ArrayList; | |
| 23 import java.util.Iterator; | |
| 24 import java.util.ListIterator; | |
| 25 | |
| 26 import digilib.image.DocuInfo; | |
| 27 import digilib.image.ImageSize; | |
| 28 | |
| 29 /** | |
| 30 * @author casties | |
| 31 */ | |
| 32 public class ImageFileset extends DocuDirent { | |
| 33 | |
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34 /** this is an image file */ |
| 159 | 35 protected static int fileClass = FileOps.CLASS_IMAGE; |
| 36 | |
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37 /** list of files (ImageFile) */ |
| 159 | 38 private ArrayList list = null; |
| 233 | 39 |
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40 /** aspect ratio (width/height) */ |
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41 private double aspect = 0; |
| 233 | 42 |
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43 /** resolution of the biggest image (DPI) */ |
| 159 | 44 private double resX = 0; |
| 233 | 45 |
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46 /** resolution of the biggest image (DPI) */ |
| 159 | 47 private double resY = 0; |
| 48 | |
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49 /** |
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50 * Creator for empty fileset with size for file list. |
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51 * |
| 159 | 52 * |
| 53 * @param initialCapacity | |
| 54 */ | |
| 55 public ImageFileset(int initialCapacity) { | |
| 56 list = new ArrayList(initialCapacity); | |
| 57 } | |
| 58 | |
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59 /** |
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60 * Creator with a file and base directories. |
| 159 | 61 * |
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62 * Reads the file and fills the fileset with corresponding files from the |
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63 * other base directories. First entry in dirs is the parent of this |
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64 * fileset. |
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65 * |
| 159 | 66 * |
| 67 * @see fill | |
| 233 | 68 * |
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69 * @param dirs |
| 233 | 70 * array of base directories |
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71 * @param file |
| 233 | 72 * first file to read |
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73 * @param scalext |
| 233 | 74 * extension for scaled images |
| 159 | 75 */ |
| 76 public ImageFileset(Directory[] dirs, File file, String scalext) { | |
| 77 int nb = dirs.length; | |
| 78 list = new ArrayList(nb); | |
| 79 parent = dirs[0]; | |
| 80 fill(dirs, file, scalext); | |
| 81 } | |
| 82 | |
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83 /** |
| 176 | 84 * Adds an ImageFile to this Fileset. |
| 159 | 85 * |
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86 * The files should be added in the order of higher to lower resolutions. |
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87 * The first file is considered the hires "original". |
| 159 | 88 * |
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89 * |
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90 * @param f |
| 233 | 91 * file to add |
| 159 | 92 * @return true (always) |
| 93 */ | |
| 94 public boolean add(ImageFile f) { | |
| 95 f.setParent(this); | |
| 96 return list.add(f); | |
| 97 } | |
| 98 | |
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99 /** |
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100 * The number of image files in this Fileset. |
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101 * |
| 159 | 102 * |
| 103 * @return number of image files | |
| 104 */ | |
| 105 public int size() { | |
| 106 return (list != null) ? list.size() : 0; | |
| 107 } | |
| 108 | |
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109 /** |
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110 * Gets the default File. |
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111 * |
| 159 | 112 */ |
| 113 public File getFile() { | |
| 114 return (list != null) ? ((ImageFile) list.get(0)).getFile() : null; | |
| 115 } | |
| 116 | |
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117 /** |
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118 * Get the ImageFile at the index. |
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119 * |
| 159 | 120 * |
| 121 * @param index | |
| 122 * @return | |
| 123 */ | |
| 124 public ImageFile get(int index) { | |
| 125 return (ImageFile) list.get(index); | |
| 126 } | |
| 127 | |
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128 /** |
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129 * Get the next smaller ImageFile than the given size. |
| 159 | 130 * |
| 233 | 131 * Returns the ImageFile from the set that has a width and height smaller or |
| 132 * equal the given size. Returns null if there isn't any smaller image. | |
| 159 | 133 * Needs DocuInfo instance to checkFile(). |
| 134 * | |
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135 * |
| 159 | 136 * @param size |
| 137 * @param info | |
| 138 * @return | |
| 139 */ | |
| 140 public ImageFile getNextSmaller(ImageSize size, DocuInfo info) { | |
| 141 for (Iterator i = getHiresIterator(); i.hasNext();) { | |
| 142 ImageFile f = (ImageFile) i.next(); | |
| 143 try { | |
| 144 if (!f.isChecked()) { | |
| 145 info.checkFile(f); | |
| 146 } | |
| 147 if (f.getSize().isTotallySmallerThan(size)) { | |
| 148 return f; | |
| 149 } | |
| 150 } catch (IOException e) { | |
| 151 } | |
| 152 } | |
| 153 return null; | |
| 154 } | |
| 155 | |
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156 /** |
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157 * Get the next bigger ImageFile than the given size. |
| 159 | 158 * |
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159 * Returns the ImageFile from the set that has a width or height bigger or |
| 233 | 160 * equal the given size. Returns null if there isn't any bigger image. Needs |
| 161 * DocuInfo instance to checkFile(). | |
| 159 | 162 * |
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163 * |
| 159 | 164 * @param size |
| 165 * @param info | |
| 166 * @return | |
| 167 */ | |
| 168 public ImageFile getNextBigger(ImageSize size, DocuInfo info) { | |
| 169 for (ListIterator i = getLoresIterator(); i.hasPrevious();) { | |
| 170 ImageFile f = (ImageFile) i.previous(); | |
| 171 try { | |
| 172 if (!f.isChecked()) { | |
| 173 info.checkFile(f); | |
| 174 } | |
| 175 if (f.getSize().isBiggerThan(size)) { | |
| 176 return f; | |
| 177 } | |
| 178 } catch (IOException e) { | |
| 179 } | |
| 180 } | |
| 181 return null; | |
| 182 } | |
| 183 | |
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184 /** |
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185 * Returns the biggest ImageFile in the set. |
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186 * |
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187 * |
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188 * @return |
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189 */ |
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190 public ImageFile getBiggest() { |
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191 return this.get(0); |
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192 } |
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193 |
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194 /** |
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195 * Returns the biggest ImageFile in the set. |
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196 * |
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197 * |
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198 * @return |
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199 */ |
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200 public ImageFile getSmallest() { |
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201 return this.get(this.size() - 1); |
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202 } |
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203 |
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204 /** |
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205 * Get an Iterator for this Fileset starting at the highest resolution |
| 159 | 206 * images. |
| 207 * | |
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208 * |
| 159 | 209 * @return |
| 210 */ | |
| 211 public ListIterator getHiresIterator() { | |
| 212 return list.listIterator(); | |
| 213 } | |
| 214 | |
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215 /** |
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216 * Get an Iterator for this Fileset starting at the lowest resolution |
| 159 | 217 * images. |
| 218 * | |
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219 * The Iterator starts at the last element, so you have to use it backwards |
| 159 | 220 * with hasPrevious() and previous(). |
| 221 * | |
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222 * |
| 159 | 223 * @return |
| 224 */ | |
| 225 public ListIterator getLoresIterator() { | |
| 226 return list.listIterator(list.size()); | |
| 227 } | |
| 228 | |
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229 /** |
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230 * Fill the ImageFileset with files from different base directories. |
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231 * |
| 159 | 232 * |
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233 * @param dirs |
| 233 | 234 * list of base directories |
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235 * @param fl |
| 233 | 236 * file (from first base dir) |
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237 * @param scalext |
| 233 | 238 * first extension to try in other base dirs |
| 159 | 239 */ |
| 240 void fill(Directory[] dirs, File fl, String scalext) { | |
| 241 int nb = dirs.length; | |
| 242 String fn = fl.getName(); | |
| 243 String fnx = fn.substring(0, fn.lastIndexOf('.') + 1); | |
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244 // add the first ImageFile to the ImageFileset |
| 159 | 245 add(new ImageFile(fn, this, parent)); |
| 246 // iterate the remaining base directories | |
| 247 for (int j = 1; j < nb; j++) { | |
| 248 if (dirs[j] == null) { | |
| 249 continue; | |
| 250 } | |
| 251 File f; | |
| 252 if (scalext != null) { | |
| 253 // use the last extension | |
| 254 f = new File(dirs[j].getDir(), fnx + scalext); | |
| 255 } else { | |
| 256 // try the same filename as the original | |
| 257 f = new File(dirs[j].getDir(), fn); | |
| 258 } | |
| 259 // if the file exists, add to the ImageFileset | |
| 260 if (f.canRead()) { | |
| 261 add(new ImageFile(f.getName(), this, dirs[j])); | |
| 262 } else { | |
| 263 // try other file extensions | |
| 264 Iterator exts = FileOps.getImageExtensionIterator(); | |
| 265 while (exts.hasNext()) { | |
| 266 String s = (String) exts.next(); | |
| 267 f = new File(dirs[j].getDir(), fnx + s); | |
| 268 // if the file exists, add to the ImageFileset | |
| 269 if (f.canRead()) { | |
| 270 add(new ImageFile(f.getName(), this, dirs[j])); | |
| 271 scalext = s; | |
| 272 break; | |
| 273 } | |
| 274 } | |
| 275 } | |
| 276 } | |
| 277 } | |
| 278 | |
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279 /** |
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280 * Checks metadata and sets resolution in resX and resY. |
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281 * |
| 159 | 282 */ |
| 283 public void checkMeta() { | |
| 284 if (metaChecked) { | |
| 285 return; | |
| 286 } | |
| 287 if (fileMeta == null) { | |
| 288 // try to read metadata file | |
| 289 readMeta(); | |
| 290 if (fileMeta == null) { | |
| 291 // try directory metadata | |
| 233 | 292 ((DocuDirectory) parent).checkMeta(); |
| 159 | 293 if (((DocuDirectory) parent).getDirMeta() != null) { |
| 294 fileMeta = ((DocuDirectory) parent).getDirMeta(); | |
| 295 } else { | |
| 233 | 296 // try parent directory metadata |
| 297 DocuDirectory gp = (DocuDirectory) parent.getParent(); | |
| 298 if (gp != null) { | |
| 299 gp.checkMeta(); | |
| 300 if (gp.getDirMeta() != null) { | |
| 301 fileMeta = gp.getDirMeta(); | |
| 302 } else { | |
| 303 // no metadata available | |
| 304 metaChecked = true; | |
| 305 return; | |
| 306 } | |
| 307 } | |
| 159 | 308 } |
| 309 } | |
| 310 } | |
| 311 metaChecked = true; | |
| 312 String s; | |
| 313 double dpi = 0; | |
| 314 double dpix = 0; | |
| 315 double dpiy = 0; | |
| 316 double sizex = 0; | |
| 317 double sizey = 0; | |
| 318 double pixx = 0; | |
| 319 double pixy = 0; | |
| 320 // DPI is valid for X and Y | |
| 321 if (fileMeta.containsKey("original-dpi")) { | |
| 322 try { | |
| 323 dpi = Double.parseDouble((String) fileMeta.get("original-dpi")); | |
| 324 } catch (NumberFormatException e) { | |
| 325 } | |
| 326 if (dpi != 0) { | |
| 327 resX = dpi; | |
| 328 resY = dpi; | |
| 329 return; | |
| 330 } | |
| 331 } | |
| 332 // DPI-X and DPI-Y | |
| 333 if (fileMeta.containsKey("original-dpi-x") | |
| 233 | 334 && fileMeta.containsKey("original-dpi-y")) { |
| 159 | 335 try { |
| 233 | 336 dpix = Double.parseDouble((String) fileMeta |
| 337 .get("original-dpi-x")); | |
| 338 dpiy = Double.parseDouble((String) fileMeta | |
| 339 .get("original-dpi-y")); | |
| 159 | 340 } catch (NumberFormatException e) { |
| 341 } | |
| 342 if ((dpix != 0) && (dpiy != 0)) { | |
| 343 resX = dpix; | |
| 344 resY = dpiy; | |
| 345 return; | |
| 346 } | |
| 347 } | |
| 348 // SIZE-X and SIZE-Y and PIXEL-X and PIXEL-Y | |
| 349 if (fileMeta.containsKey("original-size-x") | |
| 233 | 350 && fileMeta.containsKey("original-size-y") |
| 351 && fileMeta.containsKey("original-pixel-x") | |
| 352 && fileMeta.containsKey("original-pixel-y")) { | |
| 159 | 353 try { |
| 233 | 354 sizex = Double.parseDouble((String) fileMeta |
| 355 .get("original-size-x")); | |
| 356 sizey = Double.parseDouble((String) fileMeta | |
| 357 .get("original-size-y")); | |
| 358 pixx = Double.parseDouble((String) fileMeta | |
| 359 .get("original-pixel-x")); | |
| 360 pixy = Double.parseDouble((String) fileMeta | |
| 361 .get("original-pixel-y")); | |
| 159 | 362 } catch (NumberFormatException e) { |
| 363 } | |
| 364 if ((sizex != 0) && (sizey != 0) && (pixx != 0) && (pixy != 0)) { | |
| 365 resX = pixx / (sizex * 100 / 2.54); | |
| 366 resY = pixy / (sizey * 100 / 2.54); | |
| 367 return; | |
| 368 } | |
| 369 } | |
| 370 } | |
| 371 | |
| 372 /** | |
| 373 * @return | |
| 374 */ | |
| 375 public double getResX() { | |
| 376 return resX; | |
| 377 } | |
| 378 | |
| 379 /** | |
| 380 * @return | |
| 381 */ | |
| 382 public double getResY() { | |
| 383 return resY; | |
| 384 } | |
| 385 | |
|
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386 /** |
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387 * Sets the aspect ratio from an ImageSize. |
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388 * |
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389 * |
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390 * @param f |
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391 */ |
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392 public void setAspect(ImageSize s) { |
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393 aspect = s.getAspect(); |
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394 } |
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395 |
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396 /** |
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397 * Returns the aspect ratio. |
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398 * |
| 233 | 399 * Aspect ratio is (width/height). So it's <1 for portrait and >1 for |
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400 * landscape. |
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401 * |
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402 * |
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403 * @return |
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404 */ |
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405 public double getAspect() { |
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406 return aspect; |
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407 } |
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408 |
| 233 | 409 } |