Mercurial > hg > digilib-old
annotate servlet/src/digilib/io/ImageFileset.java @ 273:d4c0c4d858a9
Servlet version 1.21b3
- searching in directories got faster (real binarySearch now!)
- cached file lists get disposed
- some code cleaning (Map types instead of HashMap)
author | robcast |
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date | Tue, 12 Oct 2004 16:06:43 +0200 |
parents | beed92ee6022 |
children | c633e97cac12 |
rev | line source |
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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; | |
259 | 23 import java.util.Arrays; |
159 | 24 import java.util.Iterator; |
25 import java.util.ListIterator; | |
259 | 26 import java.util.Map; |
159 | 27 |
28 import digilib.image.DocuInfo; | |
29 import digilib.image.ImageSize; | |
30 | |
31 /** | |
32 * @author casties | |
33 */ | |
34 public class ImageFileset extends DocuDirent { | |
35 | |
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36 /** this is an image file */ |
159 | 37 protected static int fileClass = FileOps.CLASS_IMAGE; |
38 | |
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39 /** list of files (ImageFile) */ |
159 | 40 private ArrayList list = null; |
233 | 41 |
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42 /** aspect ratio (width/height) */ |
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43 private double aspect = 0; |
233 | 44 |
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45 /** resolution of the biggest image (DPI) */ |
159 | 46 private double resX = 0; |
233 | 47 |
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48 /** resolution of the biggest image (DPI) */ |
159 | 49 private double resY = 0; |
50 | |
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51 /** |
259 | 52 * Creator for empty fileset. |
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53 * |
159 | 54 * |
55 * @param initialCapacity | |
56 */ | |
259 | 57 public ImageFileset() { |
58 list = new ArrayList(); | |
159 | 59 } |
60 | |
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61 /** |
259 | 62 * Constructor with a file and hints. |
159 | 63 * |
259 | 64 * The hints are expected to contain 'basedirs' and 'scaledfilext' keys. |
233 | 65 * |
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66 * @param file |
259 | 67 * @param hints |
159 | 68 */ |
259 | 69 public ImageFileset(File file, Map hints) { |
70 Directory[] dirs = (Directory[]) hints.get(FileOps.HINT_BASEDIRS); | |
159 | 71 int nb = dirs.length; |
72 list = new ArrayList(nb); | |
73 parent = dirs[0]; | |
259 | 74 fill(dirs, file, hints); |
159 | 75 } |
259 | 76 |
77 | |
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78 /** |
176 | 79 * Adds an ImageFile to this Fileset. |
159 | 80 * |
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81 * The files should be added in the order of higher to lower resolutions. |
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82 * The first file is considered the hires "original". |
159 | 83 * |
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84 * |
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85 * @param f |
233 | 86 * file to add |
159 | 87 * @return true (always) |
88 */ | |
89 public boolean add(ImageFile f) { | |
90 f.setParent(this); | |
91 return list.add(f); | |
92 } | |
93 | |
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94 /** |
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95 * The number of image files in this Fileset. |
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96 * |
159 | 97 * |
98 * @return number of image files | |
99 */ | |
100 public int size() { | |
101 return (list != null) ? list.size() : 0; | |
102 } | |
103 | |
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104 /** |
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105 * Gets the default File. |
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106 * |
159 | 107 */ |
108 public File getFile() { | |
109 return (list != null) ? ((ImageFile) list.get(0)).getFile() : null; | |
110 } | |
111 | |
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112 /** |
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113 * Get the ImageFile at the index. |
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114 * |
159 | 115 * |
116 * @param index | |
117 * @return | |
118 */ | |
119 public ImageFile get(int index) { | |
120 return (ImageFile) list.get(index); | |
121 } | |
122 | |
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123 /** |
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124 * Get the next smaller ImageFile than the given size. |
159 | 125 * |
233 | 126 * Returns the ImageFile from the set that has a width and height smaller or |
127 * equal the given size. Returns null if there isn't any smaller image. | |
159 | 128 * Needs DocuInfo instance to checkFile(). |
129 * | |
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130 * |
159 | 131 * @param size |
132 * @param info | |
133 * @return | |
134 */ | |
135 public ImageFile getNextSmaller(ImageSize size, DocuInfo info) { | |
136 for (Iterator i = getHiresIterator(); i.hasNext();) { | |
137 ImageFile f = (ImageFile) i.next(); | |
138 try { | |
139 if (!f.isChecked()) { | |
140 info.checkFile(f); | |
141 } | |
142 if (f.getSize().isTotallySmallerThan(size)) { | |
143 return f; | |
144 } | |
145 } catch (IOException e) { | |
146 } | |
147 } | |
148 return null; | |
149 } | |
150 | |
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151 /** |
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152 * Get the next bigger ImageFile than the given size. |
159 | 153 * |
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154 * Returns the ImageFile from the set that has a width or height bigger or |
233 | 155 * equal the given size. Returns null if there isn't any bigger image. Needs |
156 * DocuInfo instance to checkFile(). | |
159 | 157 * |
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158 * |
159 | 159 * @param size |
160 * @param info | |
161 * @return | |
162 */ | |
163 public ImageFile getNextBigger(ImageSize size, DocuInfo info) { | |
164 for (ListIterator i = getLoresIterator(); i.hasPrevious();) { | |
165 ImageFile f = (ImageFile) i.previous(); | |
166 try { | |
167 if (!f.isChecked()) { | |
168 info.checkFile(f); | |
169 } | |
170 if (f.getSize().isBiggerThan(size)) { | |
171 return f; | |
172 } | |
173 } catch (IOException e) { | |
174 } | |
175 } | |
176 return null; | |
177 } | |
178 | |
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179 /** |
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180 * Returns the biggest ImageFile in the set. |
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181 * |
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182 * |
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183 * @return |
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184 */ |
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185 public ImageFile getBiggest() { |
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186 return this.get(0); |
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187 } |
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188 |
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189 /** |
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190 * Returns the biggest ImageFile in the set. |
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191 * |
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192 * |
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193 * @return |
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194 */ |
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195 public ImageFile getSmallest() { |
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196 return this.get(this.size() - 1); |
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197 } |
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198 |
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199 /** |
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200 * Get an Iterator for this Fileset starting at the highest resolution |
159 | 201 * images. |
202 * | |
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203 * |
159 | 204 * @return |
205 */ | |
206 public ListIterator getHiresIterator() { | |
207 return list.listIterator(); | |
208 } | |
209 | |
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210 /** |
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211 * Get an Iterator for this Fileset starting at the lowest resolution |
159 | 212 * images. |
213 * | |
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214 * The Iterator starts at the last element, so you have to use it backwards |
159 | 215 * with hasPrevious() and previous(). |
216 * | |
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217 * |
159 | 218 * @return |
219 */ | |
220 public ListIterator getLoresIterator() { | |
221 return list.listIterator(list.size()); | |
222 } | |
223 | |
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224 /** |
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225 * Fill the ImageFileset with files from different base directories. |
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226 * |
159 | 227 * |
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228 * @param dirs |
233 | 229 * list of base directories |
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230 * @param fl |
233 | 231 * file (from first base dir) |
259 | 232 * @param hints |
233 * | |
159 | 234 */ |
259 | 235 void fill(Directory[] dirs, File fl, Map hints) { |
236 String scalext = (String) hints.get(FileOps.HINT_FILEEXT); | |
159 | 237 int nb = dirs.length; |
238 String fn = fl.getName(); | |
259 | 239 String baseFn = FileOps.basename(fn); |
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240 // add the first ImageFile to the ImageFileset |
159 | 241 add(new ImageFile(fn, this, parent)); |
242 // iterate the remaining base directories | |
243 for (int j = 1; j < nb; j++) { | |
244 if (dirs[j] == null) { | |
245 continue; | |
246 } | |
259 | 247 // read the directories |
248 if (dirs[j].getFilenames() == null) { | |
249 dirs[j].readDir(); | |
250 } | |
251 File f = null; | |
252 String[] dirFiles = dirs[j].getFilenames(); | |
159 | 253 if (scalext != null) { |
254 // use the last extension | |
259 | 255 int i = Arrays.binarySearch(dirFiles, baseFn + scalext); |
256 if (i >= 0) { | |
257 f = new File(dirs[j].getDir(), dirFiles[i]); | |
258 } | |
159 | 259 } else { |
260 // try the same filename as the original | |
259 | 261 int i = Arrays.binarySearch(dirFiles, fn); |
262 if (i >= 0) { | |
263 f = new File(dirs[j].getDir(), dirFiles[i]); | |
264 } | |
159 | 265 } |
259 | 266 // if the file doesn't exists, try other file extensions |
267 if (f == null) { | |
159 | 268 // try other file extensions |
259 | 269 for (Iterator exts = FileOps.getImageExtensionIterator(); exts.hasNext();) { |
159 | 270 String s = (String) exts.next(); |
259 | 271 int i = Arrays.binarySearch(dirFiles, baseFn + s); |
272 if (i >= 0) { | |
273 hints.put(FileOps.HINT_FILEEXT, s); | |
274 f = new File(dirs[j].getDir(), dirFiles[i]); | |
159 | 275 break; |
276 } | |
277 } | |
278 } | |
259 | 279 if (f != null) { |
280 add(new ImageFile(f.getName(), this, dirs[j])); | |
281 } | |
159 | 282 } |
283 } | |
284 | |
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285 /** |
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286 * Checks metadata and sets resolution in resX and resY. |
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287 * |
159 | 288 */ |
289 public void checkMeta() { | |
290 if (metaChecked) { | |
291 return; | |
292 } | |
293 if (fileMeta == null) { | |
294 // try to read metadata file | |
295 readMeta(); | |
296 if (fileMeta == null) { | |
297 // try directory metadata | |
233 | 298 ((DocuDirectory) parent).checkMeta(); |
159 | 299 if (((DocuDirectory) parent).getDirMeta() != null) { |
300 fileMeta = ((DocuDirectory) parent).getDirMeta(); | |
301 } else { | |
233 | 302 // try parent directory metadata |
303 DocuDirectory gp = (DocuDirectory) parent.getParent(); | |
304 if (gp != null) { | |
305 gp.checkMeta(); | |
306 if (gp.getDirMeta() != null) { | |
307 fileMeta = gp.getDirMeta(); | |
308 } else { | |
309 // no metadata available | |
310 metaChecked = true; | |
311 return; | |
312 } | |
313 } | |
159 | 314 } |
315 } | |
316 } | |
317 metaChecked = true; | |
318 String s; | |
319 double dpi = 0; | |
320 double dpix = 0; | |
321 double dpiy = 0; | |
322 double sizex = 0; | |
323 double sizey = 0; | |
324 double pixx = 0; | |
325 double pixy = 0; | |
326 // DPI is valid for X and Y | |
327 if (fileMeta.containsKey("original-dpi")) { | |
328 try { | |
329 dpi = Double.parseDouble((String) fileMeta.get("original-dpi")); | |
330 } catch (NumberFormatException e) { | |
331 } | |
332 if (dpi != 0) { | |
333 resX = dpi; | |
334 resY = dpi; | |
335 return; | |
336 } | |
337 } | |
338 // DPI-X and DPI-Y | |
339 if (fileMeta.containsKey("original-dpi-x") | |
233 | 340 && fileMeta.containsKey("original-dpi-y")) { |
159 | 341 try { |
233 | 342 dpix = Double.parseDouble((String) fileMeta |
343 .get("original-dpi-x")); | |
344 dpiy = Double.parseDouble((String) fileMeta | |
345 .get("original-dpi-y")); | |
159 | 346 } catch (NumberFormatException e) { |
347 } | |
348 if ((dpix != 0) && (dpiy != 0)) { | |
349 resX = dpix; | |
350 resY = dpiy; | |
351 return; | |
352 } | |
353 } | |
354 // SIZE-X and SIZE-Y and PIXEL-X and PIXEL-Y | |
355 if (fileMeta.containsKey("original-size-x") | |
233 | 356 && fileMeta.containsKey("original-size-y") |
357 && fileMeta.containsKey("original-pixel-x") | |
358 && fileMeta.containsKey("original-pixel-y")) { | |
159 | 359 try { |
233 | 360 sizex = Double.parseDouble((String) fileMeta |
361 .get("original-size-x")); | |
362 sizey = Double.parseDouble((String) fileMeta | |
363 .get("original-size-y")); | |
364 pixx = Double.parseDouble((String) fileMeta | |
365 .get("original-pixel-x")); | |
366 pixy = Double.parseDouble((String) fileMeta | |
367 .get("original-pixel-y")); | |
159 | 368 } catch (NumberFormatException e) { |
369 } | |
370 if ((sizex != 0) && (sizey != 0) && (pixx != 0) && (pixy != 0)) { | |
371 resX = pixx / (sizex * 100 / 2.54); | |
372 resY = pixy / (sizey * 100 / 2.54); | |
373 return; | |
374 } | |
375 } | |
376 } | |
377 | |
378 /** | |
379 * @return | |
380 */ | |
381 public double getResX() { | |
382 return resX; | |
383 } | |
384 | |
385 /** | |
386 * @return | |
387 */ | |
388 public double getResY() { | |
389 return resY; | |
390 } | |
391 | |
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392 /** |
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393 * Sets the aspect ratio from an ImageSize. |
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394 * |
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395 * |
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396 * @param f |
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397 */ |
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398 public void setAspect(ImageSize s) { |
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399 aspect = s.getAspect(); |
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400 } |
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401 |
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402 /** |
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403 * Returns the aspect ratio. |
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404 * |
233 | 405 * Aspect ratio is (width/height). So it's <1 for portrait and >1 for |
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406 * landscape. |
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407 * |
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408 * |
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409 * @return |
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410 */ |
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411 public double getAspect() { |
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412 return aspect; |
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413 } |
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414 |
233 | 415 } |