src/be/nikiroo/fanfix/library/BasicLibrary.java

   1 package be.nikiroo.fanfix.library;
   2
   3 import java.io.File;
   4 import java.io.IOException;
   5 import java.net.URL;
   6 import java.net.UnknownHostException;
   7 import java.util.ArrayList;
   8 import java.util.Collections;
   9 import java.util.List;
  10 import java.util.Map;
  11 import java.util.TreeMap;
  12
  13 import be.nikiroo.fanfix.Instance;
  14 import be.nikiroo.fanfix.data.MetaData;
  15 import be.nikiroo.fanfix.data.Story;
  16 import be.nikiroo.fanfix.output.BasicOutput;
  17 import be.nikiroo.fanfix.output.BasicOutput.OutputType;
  18 import be.nikiroo.fanfix.supported.BasicSupport;
  19 import be.nikiroo.fanfix.supported.SupportType;
  20 import be.nikiroo.utils.Image;
  21 import be.nikiroo.utils.Progress;
  22 import be.nikiroo.utils.StringUtils;
  23
  24 /**
  25  * Manage a library of Stories: import, export, list, modify.
  26  * <p>
  27  * Each {@link Story} object will be associated with a (local to the library)
  28  * unique ID, the LUID, which will be used to identify the {@link Story}.
  29  * <p>
  30  * Most of the {@link BasicLibrary} functions work on a partial (cover
  31  * <b>MAY</b> not be included) {@link MetaData} object.
  32  *
  33  * @author niki
  34  */
  35 abstract public class BasicLibrary {
  36         /**
  37          * A {@link BasicLibrary} status.
  38          *
  39          * @author niki
  40          */
  41         public enum Status {
  42                 /** The library is ready. */
  43                 READY,
  44                 /** The library is invalid (not correctly set up). */
  45                 INVALID,
  46                 /** You are not allowed to access this library. */
  47                 UNAUTORIZED,
  48                 /** The library is currently out of commission. */
  49                 UNAVAILABLE,
  50         }
  51
  52         /**
  53          * Return a name for this library (the UI may display this).
  54          * <p>
  55          * Must not be NULL.
  56          *
  57          * @return the name, or an empty {@link String} if none
  58          */
  59         public String getLibraryName() {
  60                 return "";
  61         }
  62
  63         /**
  64          * The library status.
  65          *
  66          * @return the current status
  67          */
  68         public Status getStatus() {
  69                 return Status.READY;
  70         }
  71
  72         /**
  73          * Retrieve the main {@link File} corresponding to the given {@link Story},
  74          * which can be passed to an external reader or instance.
  75          * <p>
  76          * Do <b>NOT</b> alter this file.
  77          *
  78          * @param luid
  79          *            the Library UID of the story
  80          * @param pg
  81          *            the optional {@link Progress}
  82          *
  83          * @return the corresponding {@link Story}
  84          */
  85         public abstract File getFile(String luid, Progress pg);
  86
  87         /**
  88          * Return the cover image associated to this story.
  89          *
  90          * @param luid
  91          *            the Library UID of the story
  92          *
  93          * @return the cover image
  94          */
  95         public abstract Image getCover(String luid);
  96
  97         /**
  98          * Return the cover image associated to this source.
  99          * <p>
 100          * By default, return the custom cover if any, and if not, return the cover
 101          * of the first story with this source.
 102          *
 103          * @param source
 104          *            the source
 105          *
 106          * @return the cover image or NULL
 107          */
 108         public Image getSourceCover(String source) {
 109                 Image custom = getCustomSourceCover(source);
 110                 if (custom != null) {
 111                         return custom;
 112                 }
 113
 114                 List<MetaData> metas = getListBySource(source);
 115                 if (metas.size() > 0) {
 116                         return getCover(metas.get(0).getLuid());
 117                 }
 118
 119                 return null;
 120         }
 121
 122         /**
 123          * Return the cover image associated to this author.
 124          * <p>
 125          * By default, return the custom cover if any, and if not, return the cover
 126          * of the first story with this author.
 127          *
 128          * @param author
 129          *            the author
 130          *
 131          * @return the cover image or NULL
 132          */
 133         public Image getAuthorCover(String author) {
 134                 Image custom = getCustomAuthorCover(author);
 135                 if (custom != null) {
 136                         return custom;
 137                 }
 138
 139                 List<MetaData> metas = getListByAuthor(author);
 140                 if (metas.size() > 0) {
 141                         return getCover(metas.get(0).getLuid());
 142                 }
 143
 144                 return null;
 145         }
 146
 147         /**
 148          * Return the custom cover image associated to this source.
 149          * <p>
 150          * By default, return NULL.
 151          *
 152          * @param source
 153          *            the source to look for
 154          *
 155          * @return the custom cover or NULL if none
 156          */
 157         public Image getCustomSourceCover(@SuppressWarnings("unused") String source) {
 158                 return null;
 159         }
 160
 161         /**
 162          * Return the custom cover image associated to this author.
 163          * <p>
 164          * By default, return NULL.
 165          *
 166          * @param author
 167          *            the author to look for
 168          *
 169          * @return the custom cover or NULL if none
 170          */
 171         public Image getCustomAuthorCover(@SuppressWarnings("unused") String author) {
 172                 return null;
 173         }
 174
 175         /**
 176          * Set the source cover to the given story cover.
 177          *
 178          * @param source
 179          *            the source to change
 180          * @param luid
 181          *            the story LUID
 182          */
 183         public abstract void setSourceCover(String source, String luid);
 184
 185         /**
 186          * Set the author cover to the given story cover.
 187          *
 188          * @param source
 189          *            the author to change
 190          * @param luid
 191          *            the story LUID
 192          */
 193         public abstract void setAuthorCover(String author, String luid);
 194
 195         /**
 196          * Return the list of stories (represented by their {@link MetaData}, which
 197          * <b>MAY</b> not have the cover included).
 198          *
 199          * @param pg
 200          *            the optional {@link Progress}
 201          *
 202          * @return the list (can be empty but not NULL)
 203          */
 204         protected abstract List<MetaData> getMetas(Progress pg);
 205
 206         /**
 207          * Invalidate the {@link Story} cache (when the content should be re-read
 208          * because it was changed).
 209          */
 210         protected void invalidateInfo() {
 211                 invalidateInfo(null);
 212         }
 213
 214         /**
 215          * Invalidate the {@link Story} cache (when the content is removed).
 216          * <p>
 217          * All the cache can be deleted if NULL is passed as meta.
 218          *
 219          * @param luid
 220          *            the LUID of the {@link Story} to clear from the cache, or NULL
 221          *            for all stories
 222          */
 223         protected abstract void invalidateInfo(String luid);
 224
 225         /**
 226          * Invalidate the {@link Story} cache (when the content has changed, but we
 227          * already have it) with the new given meta.
 228          *
 229          * @param meta
 230          *            the {@link Story} to clear from the cache
 231          */
 232         protected abstract void updateInfo(MetaData meta);
 233
 234         /**
 235          * Return the next LUID that can be used.
 236          *
 237          * @return the next luid
 238          */
 239         protected abstract int getNextId();
 240
 241         /**
 242          * Delete the target {@link Story}.
 243          *
 244          * @param luid
 245          *            the LUID of the {@link Story}
 246          *
 247          * @throws IOException
 248          *             in case of I/O error or if the {@link Story} wa not found
 249          */
 250         protected abstract void doDelete(String luid) throws IOException;
 251
 252         /**
 253          * Actually save the story to the back-end.
 254          *
 255          * @param story
 256          *            the {@link Story} to save
 257          * @param pg
 258          *            the optional {@link Progress}
 259          *
 260          * @return the saved {@link Story} (which may have changed, especially
 261          *         regarding the {@link MetaData})
 262          *
 263          * @throws IOException
 264          *             in case of I/O error
 265          */
 266         protected abstract Story doSave(Story story, Progress pg)
 267                         throws IOException;
 268
 269         /**
 270          * Refresh the {@link BasicLibrary}, that is, make sure all metas are
 271          * loaded.
 272          *
 273          * @param pg
 274          *            the optional progress reporter
 275          */
 276         public void refresh(Progress pg) {
 277                 getMetas(pg);
 278         }
 279
 280         /**
 281          * List all the known types (sources) of stories.
 282          *
 283          * @return the sources
 284          */
 285         public synchronized List<String> getSources() {
 286                 List<String> list = new ArrayList<String>();
 287                 for (MetaData meta : getMetas(null)) {
 288                         String storySource = meta.getSource();
 289                         if (!list.contains(storySource)) {
 290                                 list.add(storySource);
 291                         }
 292                 }
 293
 294                 Collections.sort(list);
 295                 return list;
 296         }
 297
 298         /**
 299          * List all the known types (sources) of stories, grouped by directory
 300          * ("Source_1/a" and "Source_1/b" will be grouped into "Source_1").
 301          * <p>
 302          * Note that an empty item in the list means a non-grouped source (type) --
 303          * e.g., you could have for Source_1:
 304          * <ul>
 305          * <li><tt></tt>: empty, so source is "Source_1"</li>
 306          * <li><tt>a</tt>: empty, so source is "Source_1/a"</li>
 307          * <li><tt>b</tt>: empty, so source is "Source_1/b"</li>
 308          * </ul>
 309          *
 310          * @return the grouped list
 311          */
 312         public synchronized Map<String, List<String>> getSourcesGrouped() {
 313                 Map<String, List<String>> map = new TreeMap<String, List<String>>();
 314                 for (String source : getSources()) {
 315                         String name;
 316                         String subname;
 317
 318                         int pos = source.indexOf('/');
 319                         if (pos > 0 && pos < source.length() - 1) {
 320                                 name = source.substring(0, pos);
 321                                 subname = source.substring(pos + 1);
 322
 323                         } else {
 324                                 name = source;
 325                                 subname = "";
 326                         }
 327
 328                         List<String> list = map.get(name);
 329                         if (list == null) {
 330                                 list = new ArrayList<String>();
 331                                 map.put(name, list);
 332                         }
 333                         list.add(subname);
 334                 }
 335
 336                 return map;
 337         }
 338
 339         /**
 340          * List all the known authors of stories.
 341          *
 342          * @return the authors
 343          */
 344         public synchronized List<String> getAuthors() {
 345                 List<String> list = new ArrayList<String>();
 346                 for (MetaData meta : getMetas(null)) {
 347                         String storyAuthor = meta.getAuthor();
 348                         if (!list.contains(storyAuthor)) {
 349                                 list.add(storyAuthor);
 350                         }
 351                 }
 352
 353                 Collections.sort(list);
 354                 return list;
 355         }
 356
 357         /**
 358          * Return the list of authors, grouped by starting letter(s) if needed.
 359          * <p>
 360          * If the number of author is not too high, only one group with an empty
 361          * name and all the authors will be returned.
 362          * <p>
 363          * If not, the authors will be separated into groups:
 364          * <ul>
 365          * <li><tt>*</tt>: any author whose name doesn't contain letters nor numbers
 366          * </li>
 367          * <li><tt>0-9</tt>: any authors whose name starts with a number</li>
 368          * <li><tt>A-C</tt> (for instance): any author whose name starts with
 369          * <tt>A</tt>, <tt>B</tt> or <tt>C</tt></li>
 370          * </ul>
 371          * Note that the letters used in the groups can vary (except <tt>*</tt> and
 372          * <tt>0-9</tt>, which may only be present or not).
 373          *
 374          * @return the authors' names, grouped by letter(s)
 375          */
 376         public Map<String, List<String>> getAuthorsGrouped() {
 377                 int MAX = 20;
 378
 379                 Map<String, List<String>> groups = new TreeMap<String, List<String>>();
 380                 List<String> authors = getAuthors();
 381
 382                 // If all authors fit the max, just report them as is
 383                 if (authors.size() <= MAX) {
 384                         groups.put("", authors);
 385                         return groups;
 386                 }
 387
 388                 // Create groups A to Z, which can be empty here
 389                 for (char car = 'A'; car <= 'Z'; car++) {
 390                         groups.put(Character.toString(car), getAuthorsGroup(authors, car));
 391                 }
 392
 393                 // Collapse them
 394                 List<String> keys = new ArrayList<String>(groups.keySet());
 395                 for (int i = 0; i + 1 < keys.size(); i++) {
 396                         String keyNow = keys.get(i);
 397                         String keyNext = keys.get(i + 1);
 398
 399                         List<String> now = groups.get(keyNow);
 400                         List<String> next = groups.get(keyNext);
 401
 402                         int currentTotal = now.size() + next.size();
 403                         if (currentTotal <= MAX) {
 404                                 String key = keyNow.charAt(0) + "-"
 405                                                 + keyNext.charAt(keyNext.length() - 1);
 406
 407                                 List<String> all = new ArrayList<String>();
 408                                 all.addAll(now);
 409                                 all.addAll(next);
 410
 411                                 groups.remove(keyNow);
 412                                 groups.remove(keyNext);
 413                                 groups.put(key, all);
 414
 415                                 keys.set(i, key); // set the new key instead of key(i)
 416                                 keys.remove(i + 1); // remove the next, consumed key
 417                                 i--; // restart at key(i)
 418                         }
 419                 }
 420
 421                 // Add "special" groups
 422                 groups.put("*", getAuthorsGroup(authors, '*'));
 423                 groups.put("0-9", getAuthorsGroup(authors, '0'));
 424
 425                 // Prune empty groups
 426                 keys = new ArrayList<String>(groups.keySet());
 427                 for (String key : keys) {
 428                         if (groups.get(key).isEmpty()) {
 429                                 groups.remove(key);
 430                         }
 431                 }
 432
 433                 return groups;
 434         }
 435
 436         /**
 437          * Get all the authors that start with the given character:
 438          * <ul>
 439          * <li><tt>*</tt>: any author whose name doesn't contain letters nor numbers
 440          * </li>
 441          * <li><tt>0</tt>: any authors whose name starts with a number</li>
 442          * <li><tt>A</tt> (any capital latin letter): any author whose name starts
 443          * with <tt>A</tt></li>
 444          * </ul>
 445          *
 446          * @param authors
 447          *            the full list of authors
 448          * @param car
 449          *            the starting character, <tt>*</tt>, <tt>0</tt> or a capital
 450          *            letter
 451          * @return the authors that fulfill the starting letter
 452          */
 453         private List<String> getAuthorsGroup(List<String> authors, char car) {
 454                 List<String> accepted = new ArrayList<String>();
 455                 for (String author : authors) {
 456                         char first = '*';
 457                         for (int i = 0; first == '*' && i < author.length(); i++) {
 458                                 String san = StringUtils.sanitize(author, true, true);
 459                                 char c = san.charAt(i);
 460                                 if (c >= '0' && c <= '9') {
 461                                         first = '0';
 462                                 } else if (c >= 'a' && c <= 'z') {
 463                                         first = (char) (c - 'a' + 'A');
 464                                 } else if (c >= 'A' && c <= 'Z') {
 465                                         first = c;
 466                                 }
 467                         }
 468
 469                         if (first == car) {
 470                                 accepted.add(author);
 471                         }
 472                 }
 473
 474                 return accepted;
 475         }
 476
 477         /**
 478          * List all the stories in the {@link BasicLibrary}.
 479          * <p>
 480          * Cover images <b>MAYBE</b> not included.
 481          *
 482          * @return the stories
 483          */
 484         public synchronized List<MetaData> getList() {
 485                 return getMetas(null);
 486         }
 487
 488         /**
 489          * List all the stories of the given source type in the {@link BasicLibrary}
 490          * , or all the stories if NULL is passed as a type.
 491          * <p>
 492          * Cover images not included.
 493          *
 494          * @param type
 495          *            the type of story to retrieve, or NULL for all
 496          *
 497          * @return the stories
 498          */
 499         public synchronized List<MetaData> getListBySource(String type) {
 500                 List<MetaData> list = new ArrayList<MetaData>();
 501                 for (MetaData meta : getMetas(null)) {
 502                         String storyType = meta.getSource();
 503                         if (type == null || type.equalsIgnoreCase(storyType)) {
 504                                 list.add(meta);
 505                         }
 506                 }
 507
 508                 Collections.sort(list);
 509                 return list;
 510         }
 511
 512         /**
 513          * List all the stories of the given author in the {@link BasicLibrary}, or
 514          * all the stories if NULL is passed as an author.
 515          * <p>
 516          * Cover images not included.
 517          *
 518          * @param author
 519          *            the author of the stories to retrieve, or NULL for all
 520          *
 521          * @return the stories
 522          */
 523         public synchronized List<MetaData> getListByAuthor(String author) {
 524                 List<MetaData> list = new ArrayList<MetaData>();
 525                 for (MetaData meta : getMetas(null)) {
 526                         String storyAuthor = meta.getAuthor();
 527                         if (author == null || author.equalsIgnoreCase(storyAuthor)) {
 528                                 list.add(meta);
 529                         }
 530                 }
 531
 532                 Collections.sort(list);
 533                 return list;
 534         }
 535
 536         /**
 537          * Retrieve a {@link MetaData} corresponding to the given {@link Story},
 538          * cover image <b>MAY</b> not be included.
 539          *
 540          * @param luid
 541          *            the Library UID of the story
 542          *
 543          * @return the corresponding {@link Story}
 544          */
 545         public synchronized MetaData getInfo(String luid) {
 546                 if (luid != null) {
 547                         for (MetaData meta : getMetas(null)) {
 548                                 if (luid.equals(meta.getLuid())) {
 549                                         return meta;
 550                                 }
 551                         }
 552                 }
 553
 554                 return null;
 555         }
 556
 557         /**
 558          * Retrieve a specific {@link Story}.
 559          *
 560          * @param luid
 561          *            the Library UID of the story
 562          * @param pg
 563          *            the optional progress reporter
 564          *
 565          * @return the corresponding {@link Story} or NULL if not found
 566          */
 567         public synchronized Story getStory(String luid, Progress pg) {
 568                 if (pg == null) {
 569                         pg = new Progress();
 570                 }
 571
 572                 Progress pgGet = new Progress();
 573                 Progress pgProcess = new Progress();
 574
 575                 pg.setMinMax(0, 2);
 576                 pg.addProgress(pgGet, 1);
 577                 pg.addProgress(pgProcess, 1);
 578
 579                 Story story = null;
 580                 for (MetaData meta : getMetas(null)) {
 581                         if (meta.getLuid().equals(luid)) {
 582                                 File file = getFile(luid, pgGet);
 583                                 pgGet.done();
 584                                 try {
 585                                         SupportType type = SupportType.valueOfAllOkUC(meta
 586                                                         .getType());
 587                                         URL url = file.toURI().toURL();
 588                                         if (type != null) {
 589                                                 story = BasicSupport.getSupport(type, url) //
 590                                                                 .process(pgProcess);
 591
 592                                                 // Because we do not want to clear the meta cache:
 593                                                 meta.setCover(story.getMeta().getCover());
 594                                                 meta.setResume(story.getMeta().getResume());
 595                                                 story.setMeta(meta);
 596                                                 //
 597                                         } else {
 598                                                 throw new IOException("Unknown type: " + meta.getType());
 599                                         }
 600                                 } catch (IOException e) {
 601                                         // We should not have not-supported files in the
 602                                         // library
 603                                         Instance.getTraceHandler().error(
 604                                                         new IOException("Cannot load file from library: "
 605                                                                         + file, e));
 606                                 } finally {
 607                                         pgProcess.done();
 608                                         pg.done();
 609                                 }
 610
 611                                 break;
 612                         }
 613                 }
 614
 615                 return story;
 616         }
 617
 618         /**
 619          * Import the {@link Story} at the given {@link URL} into the
 620          * {@link BasicLibrary}.
 621          *
 622          * @param url
 623          *            the {@link URL} to import
 624          * @param pg
 625          *            the optional progress reporter
 626          *
 627          * @return the imported {@link Story}
 628          *
 629          * @throws UnknownHostException
 630          *             if the host is not supported
 631          * @throws IOException
 632          *             in case of I/O error
 633          */
 634         public Story imprt(URL url, Progress pg) throws IOException {
 635                 if (pg == null)
 636                         pg = new Progress();
 637
 638                 pg.setMinMax(0, 1000);
 639                 Progress pgProcess = new Progress();
 640                 Progress pgSave = new Progress();
 641                 pg.addProgress(pgProcess, 800);
 642                 pg.addProgress(pgSave, 200);
 643
 644                 BasicSupport support = BasicSupport.getSupport(url);
 645                 if (support == null) {
 646                         throw new UnknownHostException("" + url);
 647                 }
 648
 649                 Story story = save(support.process(pgProcess), pgSave);
 650                 pg.done();
 651
 652                 return story;
 653         }
 654
 655         /**
 656          * Import the story from one library to another, and keep the same LUID.
 657          *
 658          * @param other
 659          *            the other library to import from
 660          * @param luid
 661          *            the Library UID
 662          * @param pg
 663          *            the optional progress reporter
 664          *
 665          * @throws IOException
 666          *             in case of I/O error
 667          */
 668         public void imprt(BasicLibrary other, String luid, Progress pg)
 669                         throws IOException {
 670                 Progress pgGetStory = new Progress();
 671                 Progress pgSave = new Progress();
 672                 if (pg == null) {
 673                         pg = new Progress();
 674                 }
 675
 676                 pg.setMinMax(0, 2);
 677                 pg.addProgress(pgGetStory, 1);
 678                 pg.addProgress(pgSave, 1);
 679
 680                 Story story = other.getStory(luid, pgGetStory);
 681                 if (story != null) {
 682                         story = this.save(story, luid, pgSave);
 683                         pg.done();
 684                 } else {
 685                         pg.done();
 686                         throw new IOException("Cannot find story in Library: " + luid);
 687                 }
 688         }
 689
 690         /**
 691          * Export the {@link Story} to the given target in the given format.
 692          *
 693          * @param luid
 694          *            the {@link Story} ID
 695          * @param type
 696          *            the {@link OutputType} to transform it to
 697          * @param target
 698          *            the target to save to
 699          * @param pg
 700          *            the optional progress reporter
 701          *
 702          * @return the saved resource (the main saved {@link File})
 703          *
 704          * @throws IOException
 705          *             in case of I/O error
 706          */
 707         public File export(String luid, OutputType type, String target, Progress pg)
 708                         throws IOException {
 709                 Progress pgGetStory = new Progress();
 710                 Progress pgOut = new Progress();
 711                 if (pg != null) {
 712                         pg.setMax(2);
 713                         pg.addProgress(pgGetStory, 1);
 714                         pg.addProgress(pgOut, 1);
 715                 }
 716
 717                 BasicOutput out = BasicOutput.getOutput(type, false, false);
 718                 if (out == null) {
 719                         throw new IOException("Output type not supported: " + type);
 720                 }
 721
 722                 Story story = getStory(luid, pgGetStory);
 723                 if (story == null) {
 724                         throw new IOException("Cannot find story to export: " + luid);
 725                 }
 726
 727                 return out.process(story, target, pgOut);
 728         }
 729
 730         /**
 731          * Save a {@link Story} to the {@link BasicLibrary}.
 732          *
 733          * @param story
 734          *            the {@link Story} to save
 735          * @param pg
 736          *            the optional progress reporter
 737          *
 738          * @return the same {@link Story}, whose LUID may have changed
 739          *
 740          * @throws IOException
 741          *             in case of I/O error
 742          */
 743         public Story save(Story story, Progress pg) throws IOException {
 744                 return save(story, null, pg);
 745         }
 746
 747         /**
 748          * Save a {@link Story} to the {@link BasicLibrary} -- the LUID <b>must</b>
 749          * be correct, or NULL to get the next free one.
 750          * <p>
 751          * Will override any previous {@link Story} with the same LUID.
 752          *
 753          * @param story
 754          *            the {@link Story} to save
 755          * @param luid
 756          *            the <b>correct</b> LUID or NULL to get the next free one
 757          * @param pg
 758          *            the optional progress reporter
 759          *
 760          * @return the same {@link Story}, whose LUID may have changed
 761          *
 762          * @throws IOException
 763          *             in case of I/O error
 764          */
 765         public synchronized Story save(Story story, String luid, Progress pg)
 766                         throws IOException {
 767
 768                 Instance.getTraceHandler().trace(
 769                                 this.getClass().getSimpleName() + ": saving story " + luid);
 770
 771                 // Do not change the original metadata, but change the original story
 772                 MetaData meta = story.getMeta().clone();
 773                 story.setMeta(meta);
 774
 775                 if (luid == null || luid.isEmpty()) {
 776                         meta.setLuid(String.format("%03d", getNextId()));
 777                 } else {
 778                         meta.setLuid(luid);
 779                 }
 780
 781                 if (luid != null && getInfo(luid) != null) {
 782                         delete(luid);
 783                 }
 784
 785                 story = doSave(story, pg);
 786
 787                 updateInfo(story.getMeta());
 788
 789                 Instance.getTraceHandler().trace(
 790                                 this.getClass().getSimpleName() + ": story saved (" + luid
 791                                                 + ")");
 792
 793                 return story;
 794         }
 795
 796         /**
 797          * Delete the given {@link Story} from this {@link BasicLibrary}.
 798          *
 799          * @param luid
 800          *            the LUID of the target {@link Story}
 801          *
 802          * @throws IOException
 803          *             in case of I/O error
 804          */
 805         public synchronized void delete(String luid) throws IOException {
 806                 Instance.getTraceHandler().trace(
 807                                 this.getClass().getSimpleName() + ": deleting story " + luid);
 808
 809                 doDelete(luid);
 810                 invalidateInfo(luid);
 811
 812                 Instance.getTraceHandler().trace(
 813                                 this.getClass().getSimpleName() + ": story deleted (" + luid
 814                                                 + ")");
 815         }
 816
 817         /**
 818          * Change the type (source) of the given {@link Story}.
 819          *
 820          * @param luid
 821          *            the {@link Story} LUID
 822          * @param newSource
 823          *            the new source
 824          * @param pg
 825          *            the optional progress reporter
 826          *
 827          * @throws IOException
 828          *             in case of I/O error or if the {@link Story} was not found
 829          */
 830         public synchronized void changeSource(String luid, String newSource,
 831                         Progress pg) throws IOException {
 832                 MetaData meta = getInfo(luid);
 833                 if (meta == null) {
 834                         throw new IOException("Story not found: " + luid);
 835                 }
 836
 837                 changeSTA(luid, newSource, meta.getTitle(), meta.getAuthor(), pg);
 838         }
 839
 840         /**
 841          * Change the title (name) of the given {@link Story}.
 842          *
 843          * @param luid
 844          *            the {@link Story} LUID
 845          * @param newTitle
 846          *            the new title
 847          * @param pg
 848          *            the optional progress reporter
 849          *
 850          * @throws IOException
 851          *             in case of I/O error or if the {@link Story} was not found
 852          */
 853         public synchronized void changeTitle(String luid, String newTitle,
 854                         Progress pg) throws IOException {
 855                 MetaData meta = getInfo(luid);
 856                 if (meta == null) {
 857                         throw new IOException("Story not found: " + luid);
 858                 }
 859
 860                 changeSTA(luid, meta.getSource(), newTitle, meta.getAuthor(), pg);
 861         }
 862
 863         /**
 864          * Change the author of the given {@link Story}.
 865          *
 866          * @param luid
 867          *            the {@link Story} LUID
 868          * @param newAuthor
 869          *            the new author
 870          * @param pg
 871          *            the optional progress reporter
 872          *
 873          * @throws IOException
 874          *             in case of I/O error or if the {@link Story} was not found
 875          */
 876         public synchronized void changeAuthor(String luid, String newAuthor,
 877                         Progress pg) throws IOException {
 878                 MetaData meta = getInfo(luid);
 879                 if (meta == null) {
 880                         throw new IOException("Story not found: " + luid);
 881                 }
 882
 883                 changeSTA(luid, meta.getSource(), meta.getTitle(), newAuthor, pg);
 884         }
 885
 886         /**
 887          * Change the Source, Title and Author of the {@link Story} in one single
 888          * go.
 889          *
 890          * @param luid
 891          *            the {@link Story} LUID
 892          * @param newSource
 893          *            the new source
 894          * @param newTitle
 895          *            the new title
 896          * @param newAuthor
 897          *            the new author
 898          * @param pg
 899          *            the optional progress reporter
 900          *
 901          * @throws IOException
 902          *             in case of I/O error or if the {@link Story} was not found
 903          */
 904         protected synchronized void changeSTA(String luid, String newSource,
 905                         String newTitle, String newAuthor, Progress pg) throws IOException {
 906                 MetaData meta = getInfo(luid);
 907                 if (meta == null) {
 908                         throw new IOException("Story not found: " + luid);
 909                 }
 910
 911                 meta.setSource(newSource);
 912                 meta.setTitle(newTitle);
 913                 meta.setAuthor(newAuthor);
 914                 saveMeta(meta, pg);
 915         }
 916
 917         /**
 918          * Save back the current state of the {@link MetaData} (LUID <b>MUST NOT</b>
 919          * change) for this {@link Story}.
 920          * <p>
 921          * By default, delete the old {@link Story} then recreate a new
 922          * {@link Story}.
 923          * <p>
 924          * Note that this behaviour can lead to data loss in case of problems!
 925          *
 926          * @param meta
 927          *            the new {@link MetaData} (LUID <b>MUST NOT</b> change)
 928          * @param pg
 929          *            the optional {@link Progress}
 930          *
 931          * @throws IOException
 932          *             in case of I/O error or if the {@link Story} was not found
 933          */
 934         protected synchronized void saveMeta(MetaData meta, Progress pg)
 935                         throws IOException {
 936                 if (pg == null) {
 937                         pg = new Progress();
 938                 }
 939
 940                 Progress pgGet = new Progress();
 941                 Progress pgSet = new Progress();
 942                 pg.addProgress(pgGet, 50);
 943                 pg.addProgress(pgSet, 50);
 944
 945                 Story story = getStory(meta.getLuid(), pgGet);
 946                 if (story == null) {
 947                         throw new IOException("Story not found: " + meta.getLuid());
 948                 }
 949
 950                 // TODO: this is not safe!
 951                 delete(meta.getLuid());
 952                 story.setMeta(meta);
 953                 save(story, meta.getLuid(), pgSet);
 954
 955                 pg.done();
 956         }
 957 }