Mercurial > hg > digilib-old
annotate servlet/src/digilib/io/DocuDirectory.java @ 482:f0fb0d781548
added script that adds css "fixed" attribute for IE
| author | hertzhaft |
|---|---|
| date | Fri, 04 May 2007 18:56:51 +0200 |
| parents | 1b2f8a9762ab |
| children | e758a49258e8 |
| rev | line source |
|---|---|
| 86 | 1 /* DocuDirectory -- Directory of DocuFilesets. |
| 2 | |
| 270 | 3 Digital Image Library servlet components |
| 86 | 4 |
| 270 | 5 Copyright (C) 2003 Robert Casties (robcast@mail.berlios.de) |
| 86 | 6 |
| 270 | 7 This program is free software; you can redistribute it and/or modify it |
| 8 under the terms of the GNU General Public License as published by the | |
| 9 Free Software Foundation; either version 2 of the License, or (at your | |
| 10 option) any later version. | |
| 11 | |
| 12 Please read license.txt for the full details. A copy of the GPL | |
| 13 may be found at http://www.gnu.org/copyleft/lgpl.html | |
| 86 | 14 |
| 270 | 15 You should have received a copy of the GNU General Public License |
| 16 along with this program; if not, write to the Free Software | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 86 | 18 |
| 19 * Created on 25.02.2003 | |
| 20 */ | |
| 21 | |
| 22 package digilib.io; | |
| 23 | |
| 24 import java.io.File; | |
| 130 | 25 import java.io.IOException; |
| 91 | 26 import java.util.ArrayList; |
| 270 | 27 import java.util.Collections; |
| 91 | 28 import java.util.Iterator; |
| 159 | 29 import java.util.List; |
| 259 | 30 import java.util.Map; |
| 86 | 31 |
| 130 | 32 import org.xml.sax.SAXException; |
| 33 | |
| 86 | 34 /** |
| 35 * @author casties | |
| 36 */ | |
| 149 | 37 public class DocuDirectory extends Directory { |
| 86 | 38 |
| 270 | 39 /** list of files (DocuDirent) */ |
| 159 | 40 private ArrayList[] list = null; |
| 270 | 41 |
| 42 /** directory object is valid (exists on disk) */ | |
| 86 | 43 private boolean isValid = false; |
| 270 | 44 |
| 45 /** reference of the parent DocuDirCache */ | |
| 151 | 46 private DocuDirCache cache = null; |
| 270 | 47 |
| 48 /** directory name (digilib canonical form) */ | |
| 86 | 49 private String dirName = null; |
| 270 | 50 |
| 51 /** directory metadata */ | |
| 52 private Map dirMeta = null; | |
| 53 | |
| 54 /** state of metadata is valid */ | |
| 233 | 55 private boolean metaChecked = false; |
| 270 | 56 |
| 57 /** unresolved file metadata */ | |
| 58 private Map unresolvedFileMeta = null; | |
| 59 | |
| 60 /** time of last access of this object (not the filesystem) */ | |
| 86 | 61 private long objectATime = 0; |
| 270 | 62 |
| 63 /** time directory was last modified on the file system */ | |
| 86 | 64 private long dirMTime = 0; |
| 65 | |
| 270 | 66 /** |
| 67 * Constructor with digilib directory path and a parent DocuDirCache. | |
| 86 | 68 * |
| 270 | 69 * Directory names at the given path are appended to the base directories |
| 70 * from the cache. The directory is checked on disk and isValid is set. | |
| 86 | 71 * |
| 72 * @see readDir | |
| 270 | 73 * |
| 74 * @param path | |
| 75 * digilib directory path name | |
| 76 * @param cache | |
| 77 * parent DocuDirCache | |
| 86 | 78 */ |
| 151 | 79 public DocuDirectory(String path, DocuDirCache cache) { |
| 80 this.dirName = path; | |
| 81 this.cache = cache; | |
| 159 | 82 initDir(); |
| 83 checkDir(); | |
| 86 | 84 } |
| 85 | |
| 270 | 86 /** |
| 87 * Sets and checks the dir object. | |
| 88 * | |
| 91 | 89 */ |
| 159 | 90 protected void initDir() { |
| 91 String baseDirName = cache.getBaseDirNames()[0]; | |
| 92 // clear directory first | |
| 93 list = new ArrayList[FileOps.NUM_CLASSES]; | |
| 94 isValid = false; | |
| 95 dirMTime = 0; | |
| 96 // the first directory has to exist | |
| 97 dir = new File(baseDirName, dirName); | |
| 98 } | |
| 156 | 99 |
| 270 | 100 /** |
| 101 * number of DocuFiles in this directory. | |
| 102 * | |
| 151 | 103 */ |
| 270 | 104 public int size() { |
| 105 return ((list != null) && (list[0] != null)) ? list[0].size() : 0; | |
| 151 | 106 } |
| 91 | 107 |
| 270 | 108 /** |
| 109 * number of files of this class in this directory. | |
| 151 | 110 * |
| 270 | 111 * @param fc |
| 112 * fileClass | |
| 151 | 113 */ |
| 270 | 114 public int size(int fc) { |
| 115 return ((list != null) && (list[fc] != null)) ? list[fc].size() : 0; | |
| 91 | 116 } |
| 117 | |
| 270 | 118 /** |
| 119 * Returns the ImageFile at the index. | |
| 151 | 120 * |
| 121 * @param index | |
| 122 * @return | |
| 123 */ | |
| 159 | 124 public ImageFileset get(int index) { |
| 220 | 125 if ((list == null) || (list[0] == null) || (index >= list[0].size())) { |
| 122 | 126 return null; |
| 151 | 127 } |
| 159 | 128 return (ImageFileset) list[0].get(index); |
| 129 } | |
| 130 | |
| 270 | 131 /** |
| 132 * Returns the file of the class at the index. | |
| 159 | 133 * |
| 134 * @param index | |
| 270 | 135 * @param fc |
| 136 * fileClass | |
| 159 | 137 * @return |
| 138 */ | |
| 139 public DocuDirent get(int index, int fc) { | |
| 140 if ((list == null) || (list[fc] == null) || (index >= list[fc].size())) { | |
| 141 return null; | |
| 142 } | |
| 143 return (DocuDirent) list[fc].get(index); | |
| 144 } | |
| 145 | |
| 270 | 146 /** |
| 147 * Checks if the directory exists on the filesystem. | |
| 159 | 148 * |
| 149 * Sets isValid. | |
| 150 * | |
| 151 * @return | |
| 152 */ | |
| 153 public boolean checkDir() { | |
| 154 if (dir == null) { | |
| 155 initDir(); | |
| 156 } | |
| 157 isValid = dir.isDirectory(); | |
| 158 return isValid; | |
| 91 | 159 } |
| 160 | |
| 270 | 161 /** |
| 162 * Read the filesystem directory and fill this object. | |
| 86 | 163 * |
| 130 | 164 * Clears the List and (re)reads all files. |
| 86 | 165 * |
| 166 * @return boolean the directory exists | |
| 167 */ | |
| 282 | 168 public synchronized boolean readDir() { |
| 159 | 169 // check directory first |
| 170 checkDir(); | |
| 171 if (!isValid) { | |
| 172 return false; | |
| 173 } | |
| 270 | 174 // first file extension to try for scaled directories |
| 175 String scalext = null; | |
| 259 | 176 // read all filenames |
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177 logger.debug("reading directory " + dir.getPath()); |
| 259 | 178 /* |
| 270 | 179 * using ReadableFileFilter is safer (we won't get directories with file |
| 180 * extensions) but slower. | |
| 259 | 181 */ |
| 182 File[] allFiles = null; | |
| 183 if (cache.safeDirIndex) { | |
| 184 allFiles = dir.listFiles(new FileOps.ReadableFileFilter()); | |
| 185 } else { | |
| 186 allFiles = dir.listFiles(); | |
| 187 } | |
|
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188 //logger.debug(" done"); |
| 259 | 189 if (allFiles == null) { |
| 190 // not a directory | |
| 191 return false; | |
| 192 } | |
| 270 | 193 // list of base dirs from the parent cache |
| 194 String[] baseDirNames = cache.getBaseDirNames(); | |
| 195 // number of base dirs | |
| 196 int nb = baseDirNames.length; | |
| 197 // array of base dirs | |
| 198 Directory[] dirs = new Directory[nb]; | |
| 199 // first entry is this directory | |
| 200 dirs[0] = this; | |
| 201 // fill array with the remaining directories | |
| 202 for (int j = 1; j < nb; j++) { | |
| 203 File d = new File(baseDirNames[j], dirName); | |
| 204 if (d.isDirectory()) { | |
| 205 dirs[j] = new Directory(d); | |
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206 logger.debug(" reading scaled directory " + d.getPath()); |
| 270 | 207 dirs[j].readDir(); |
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208 //logger.debug(" done"); |
| 270 | 209 } |
| 210 } | |
| 211 | |
| 159 | 212 // go through all file classes |
| 270 | 213 for (int classIdx = 0; classIdx < FileOps.NUM_CLASSES; classIdx++) { |
| 214 int fileClass = cache.getFileClasses()[classIdx]; | |
| 215 //logger.debug("filtering directory "+dir.getPath()+" for class | |
| 216 // "+fc); | |
| 217 File[] fileList = FileOps.listFiles(allFiles, FileOps | |
| 218 .filterForClass(fileClass)); | |
| 219 //logger.debug(" done"); | |
| 159 | 220 // number of files in the directory |
| 270 | 221 int numFiles = fileList.length; |
| 222 if (numFiles > 0) { | |
| 91 | 223 // create new list |
| 270 | 224 list[fileClass] = new ArrayList(numFiles); |
| 86 | 225 // sort the file names alphabetically and iterate the list |
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226 // Arrays.sort(fileList); // not needed <hertzhaft> |
| 259 | 227 Map hints = FileOps.newHints(FileOps.HINT_BASEDIRS, dirs); |
| 228 hints.put(FileOps.HINT_FILEEXT, scalext); | |
| 270 | 229 for (int i = 0; i < numFiles; i++) { |
| 230 DocuDirent f = FileOps.fileForClass(fileClass, fileList[i], | |
| 231 hints); | |
| 159 | 232 // add the file to our list |
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233 // logger.debug(f.getName()); |
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234 |
| 270 | 235 list[fileClass].add(f); |
| 159 | 236 f.setParent(this); |
| 86 | 237 } |
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238 // we sort the ArrayList, not the Array, for binarySearch to work |
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239 Collections.sort(list[fileClass]); |
| 86 | 240 } |
| 241 } | |
| 270 | 242 // clear the scaled directories |
| 243 for (int j = 1; j < nb; j++) { | |
| 244 if (dirs[j] != null) { | |
| 245 dirs[j].clearFilenames(); | |
| 246 } | |
| 247 } | |
| 248 // update number of cached files if this was the first time | |
| 249 if (dirMTime == 0) { | |
| 250 cache.numFiles += size(); | |
| 251 } | |
| 159 | 252 dirMTime = dir.lastModified(); |
| 253 // read metadata as well | |
| 254 readMeta(); | |
| 86 | 255 return isValid; |
| 256 } | |
| 257 | |
| 270 | 258 /** |
| 259 * Check to see if the directory has been modified and reread if necessary. | |
| 86 | 260 * |
| 261 * @return boolean the directory is valid | |
| 262 */ | |
| 263 public boolean refresh() { | |
| 264 if (isValid) { | |
| 265 if (dir.lastModified() > dirMTime) { | |
| 266 // on-disk modification time is more recent | |
| 267 readDir(); | |
| 268 } | |
| 269 touch(); | |
| 270 } | |
| 271 return isValid; | |
| 272 } | |
| 273 | |
| 270 | 274 /** |
| 275 * Read directory metadata. | |
| 276 * | |
| 86 | 277 */ |
| 278 public void readMeta() { | |
| 279 // check for directory metadata... | |
| 130 | 280 File mf = new File(dir, "index.meta"); |
| 281 if (mf.canRead()) { | |
| 282 XMLMetaLoader ml = new XMLMetaLoader(); | |
| 283 try { | |
| 284 // read directory meta file | |
| 270 | 285 Map fileMeta = ml.loadURL(mf.getAbsolutePath()); |
| 130 | 286 if (fileMeta == null) { |
| 287 return; | |
| 288 } | |
| 289 // meta for the directory itself is in the "" bin | |
| 270 | 290 dirMeta = (Map) fileMeta.remove(""); |
| 151 | 291 // read meta for files in this directory |
| 292 readFileMeta(fileMeta, null); | |
| 293 // is there meta for other files left? | |
| 130 | 294 if (fileMeta.size() > 0) { |
| 151 | 295 unresolvedFileMeta = fileMeta; |
| 130 | 296 } |
| 297 } catch (SAXException e) { | |
| 282 | 298 logger.warn("error parsing index.meta", e); |
| 130 | 299 } catch (IOException e) { |
| 282 | 300 logger.warn("error reading index.meta", e); |
| 130 | 301 } |
| 151 | 302 } |
| 303 readParentMeta(); | |
| 233 | 304 metaChecked = true; |
| 151 | 305 } |
| 130 | 306 |
| 270 | 307 /** |
| 308 * Read metadata from all known parent directories. | |
| 309 * | |
| 151 | 310 */ |
| 311 public void readParentMeta() { | |
| 312 // check the parent directories for additional file meta | |
| 313 Directory dd = parent; | |
| 156 | 314 String path = dir.getName(); |
| 151 | 315 while (dd != null) { |
| 156 | 316 if (((DocuDirectory) dd).hasUnresolvedFileMeta()) { |
| 317 readFileMeta(((DocuDirectory) dd).unresolvedFileMeta, path); | |
| 151 | 318 } |
| 319 // prepend parent dir path | |
| 320 path = dd.dir.getName() + "/" + path; | |
| 321 // become next parent | |
| 322 dd = dd.parent; | |
| 323 } | |
| 324 } | |
| 325 | |
| 270 | 326 /** |
| 327 * Read metadata for the files in this directory. | |
| 151 | 328 * |
| 270 | 329 * Takes a Map with meta-information, adding the relative path before the |
| 330 * lookup. | |
| 151 | 331 * |
| 332 * @param fileMeta | |
| 333 * @param relPath | |
| 270 | 334 * @param fc |
| 335 * fileClass | |
| 151 | 336 */ |
| 270 | 337 protected void readFileMeta(Map fileMeta, String relPath) { |
| 151 | 338 if (list == null) { |
| 339 // there are no files | |
| 340 return; | |
| 341 } | |
| 342 String path = (relPath != null) ? (relPath + "/") : ""; | |
| 159 | 343 // go through all file classes |
| 344 for (int nc = 0; nc < list.length; nc++) { | |
| 345 int fc = cache.getFileClasses()[nc]; | |
| 346 if (list[fc] == null) { | |
| 347 continue; | |
| 348 } | |
| 349 // iterate through the list of files in this directory | |
| 350 for (Iterator i = list[fc].iterator(); i.hasNext();) { | |
| 351 DocuDirent f = (DocuDirent) i.next(); | |
| 352 // prepend path to the filename | |
| 353 String fn = path + f.getName(); | |
| 354 // look up meta for this file and remove from dir | |
| 270 | 355 Map meta = (Map) fileMeta.remove(fn); |
| 159 | 356 if (meta != null) { |
| 357 // store meta in file | |
| 358 f.setFileMeta(meta); | |
| 359 } | |
| 360 } | |
| 361 } | |
| 362 } | |
| 363 | |
| 270 | 364 protected void notifyChildMeta(Map childmeta) { |
| 159 | 365 List children = cache.getChildren(this.dirName, true); |
| 366 if (children.size() > 0) { | |
| 367 for (Iterator i = children.iterator(); i.hasNext();) { | |
| 368 // TODO: finish this! | |
| 369 //((DocuDirectory) i.next()).readFileMeta() | |
| 151 | 370 } |
| 130 | 371 } |
| 86 | 372 } |
| 373 | |
| 270 | 374 /** |
| 375 * Update access time. | |
| 86 | 376 * |
| 377 * @return long time of last access. | |
| 378 */ | |
| 379 public long touch() { | |
| 380 long t = objectATime; | |
| 381 objectATime = System.currentTimeMillis(); | |
| 382 return t; | |
| 383 } | |
| 384 | |
| 270 | 385 /** |
| 386 * Searches for the file with the name <code>fn</code>. | |
| 86 | 387 * |
| 270 | 388 * Searches the directory for the file with the name <code>fn</code> and |
| 389 * returns its index. Returns -1 if the file cannot be found. | |
| 390 * | |
| 391 * @param fn | |
| 392 * filename | |
| 393 * @param fc | |
| 394 * file class | |
| 86 | 395 * @return int index of file <code>fn</code> |
| 396 */ | |
| 397 public int indexOf(String fn) { | |
| 159 | 398 int fc = FileOps.classForFilename(fn); |
| 399 return indexOf(fn, fc); | |
| 400 } | |
| 270 | 401 |
| 402 /** | |
| 403 * Searches for the file with the name <code>fn</code> and class fc. | |
| 159 | 404 * |
| 270 | 405 * Searches the directory for the file with the name <code>fn</code> and |
| 406 * returns its index. Returns -1 if the file cannot be found. | |
| 407 * | |
| 408 * @param fn | |
| 409 * filename | |
| 159 | 410 * @return int index of file <code>fn</code> |
| 411 */ | |
| 412 public int indexOf(String fn, int fc) { | |
| 176 | 413 if (!isRead()) { |
| 414 // read directory now | |
| 415 if (!readDir()) { | |
| 416 return -1; | |
| 417 } | |
| 418 } | |
| 288 | 419 List fileList = list[fc]; |
| 246 | 420 // empty directory? |
| 288 | 421 if (fileList == null) { |
| 246 | 422 return -1; |
| 423 } | |
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424 |
| 270 | 425 // search for exact match |
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426 // OBS: fileList needs to be sorted first (see )! <hertzhaft> |
| 288 | 427 int idx = Collections.binarySearch(fileList, fn); |
| 270 | 428 if (idx >= 0) { |
| 429 return idx; | |
| 430 } else { | |
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431 logger.debug(fn + " not found by binarysearch"); |
| 270 | 432 // try closest matches without extension |
| 282 | 433 idx = -idx - 1; |
| 288 | 434 if ((idx < fileList.size()) |
| 341 | 435 && isBaseInList(fileList, idx, fn)) { |
| 282 | 436 // idx matches |
| 437 return idx; | |
| 438 } else if ((idx > 0) | |
| 341 | 439 && isBaseInList(fileList, idx-1, fn)) { |
| 282 | 440 // idx-1 matches |
| 270 | 441 return idx - 1; |
| 288 | 442 } else if ((idx + 1 < fileList.size()) |
| 341 | 443 && isBaseInList(fileList, idx+1, fn)) { |
| 282 | 444 // idx+1 matches |
| 270 | 445 return idx + 1; |
| 86 | 446 } |
| 270 | 447 |
| 86 | 448 } |
| 449 return -1; | |
| 450 } | |
| 451 | |
| 341 | 452 private boolean isBaseInList(List fl, int idx, String fn) { |
| 453 String dfn = FileOps.basename(((DocuDirent) fl.get(idx)) | |
| 454 .getName()); | |
| 455 return (dfn.equals(fn)||dfn.equals(FileOps.basename(fn))); | |
| 456 } | |
| 457 | |
| 458 | |
| 270 | 459 /** |
| 460 * Finds the DocuDirent with the name <code>fn</code>. | |
| 86 | 461 * |
| 270 | 462 * Searches the directory for the DocuDirent with the name <code>fn</code> |
| 463 * and returns it. Returns null if the file cannot be found. | |
| 464 * | |
| 465 * @param fn | |
| 466 * filename | |
| 187 | 467 * @return DocuDirent |
| 86 | 468 */ |
| 187 | 469 public DocuDirent find(String fn) { |
| 159 | 470 int fc = FileOps.classForFilename(fn); |
| 471 int i = indexOf(fn, fc); | |
| 86 | 472 if (i >= 0) { |
| 187 | 473 return (DocuDirent) list[0].get(i); |
| 159 | 474 } |
| 475 return null; | |
| 476 } | |
| 477 | |
| 270 | 478 /** |
| 479 * Finds the DocuDirent with the name <code>fn</code> and class | |
| 480 * <code>fc</code>. | |
| 159 | 481 * |
| 270 | 482 * Searches the directory for the DocuDirent with the name <code>fn</code> |
| 483 * and returns it. Returns null if the file cannot be found. | |
| 484 * | |
| 485 * @param fn | |
| 486 * filename | |
| 187 | 487 * @return DocuDirent |
| 159 | 488 */ |
| 187 | 489 public DocuDirent find(String fn, int fc) { |
| 159 | 490 int i = indexOf(fn, fc); |
| 491 if (i >= 0) { | |
| 187 | 492 return (DocuDirent) list[fc].get(i); |
| 86 | 493 } |
| 494 return null; | |
| 495 } | |
| 496 | |
| 497 /** | |
| 270 | 498 * Returns the digilib canonical name. |
| 499 * | |
| 500 * @return | |
| 86 | 501 */ |
| 502 public String getDirName() { | |
| 503 return dirName; | |
| 504 } | |
| 505 | |
| 270 | 506 /** |
| 507 * The directory is valid (exists on disk). | |
| 159 | 508 * |
| 86 | 509 * @return boolean |
| 510 */ | |
| 511 public boolean isValid() { | |
| 512 return isValid; | |
| 513 } | |
| 514 | |
| 270 | 515 /** |
| 516 * The directory has been read from disk. | |
| 159 | 517 * |
| 518 * @return | |
| 519 */ | |
| 520 public boolean isRead() { | |
| 521 return (dirMTime != 0); | |
| 522 } | |
| 523 | |
| 86 | 524 /** |
| 525 * @return long | |
| 526 */ | |
| 527 public long getAccessTime() { | |
| 528 return objectATime; | |
| 529 } | |
| 530 | |
| 531 /** | |
| 532 * @return Hashtable | |
| 533 */ | |
| 270 | 534 public Map getDirMeta() { |
| 86 | 535 return dirMeta; |
| 536 } | |
| 270 | 537 |
| 233 | 538 /** |
| 539 * Checks metadata | |
| 540 * | |
| 541 */ | |
| 542 public void checkMeta() { | |
| 543 if (metaChecked) { | |
| 544 return; | |
| 545 } else { | |
| 546 readMeta(); | |
| 547 } | |
| 548 } | |
| 86 | 549 |
| 550 /** | |
| 551 * @return long | |
| 552 */ | |
| 553 public long getDirMTime() { | |
| 554 return dirMTime; | |
| 555 } | |
| 556 | |
| 557 /** | |
| 558 * Sets the dirMeta. | |
| 270 | 559 * |
| 560 * @param dirMeta | |
| 561 * The dirMeta to set | |
| 86 | 562 */ |
| 270 | 563 public void setDirMeta(Map dirMeta) { |
| 86 | 564 this.dirMeta = dirMeta; |
| 565 } | |
| 566 | |
| 151 | 567 public boolean hasUnresolvedFileMeta() { |
| 568 return (this.unresolvedFileMeta != null); | |
| 569 } | |
| 570 | |
| 86 | 571 } |