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 and r/w. */
  43                 READ_WRITE,
  44                 /** The library is ready, but read-only. */
  45                 READ_ONLY,
  46                 /** The library is invalid (not correctly set up). */
  47                 INVALID,
  48                 /** You are not allowed to access this library. */
  49                 UNAUTHORIZED,
  50                 /** The library is currently out of commission. */
  51                 UNAVAILABLE;
  52
  53                 /**
  54                  * The library is available (you can query it).
  55                  * <p>
  56                  * It does <b>not</b> specify if it is read-only or not.
  57                  *
  58                  * @return TRUE if it is
  59                  */
  60                 public boolean isReady() {
  61                         return (this == READ_WRITE || this == READ_ONLY);
  62                 }
  63
  64                 /**
  65                  * This library can be modified (= you are allowed to modify it).
  66                  *
  67                  * @return TRUE if it is
  68                  */
  69                 public boolean isWritable() {
  70                         return (this == READ_WRITE);
  71                 }
  72         }
  73
  74         /**
  75          * Return a name for this library (the UI may display this).
  76          * <p>
  77          * Must not be NULL.
  78          *
  79          * @return the name, or an empty {@link String} if none
  80          */
  81         public String getLibraryName() {
  82                 return "";
  83         }
  84
  85         /**
  86          * The library status.
  87          *
  88          * @return the current status
  89          */
  90         public Status getStatus() {
  91                 return Status.READ_WRITE;
  92         }
  93
  94         /**
  95          * Retrieve the main {@link File} corresponding to the given {@link Story},
  96          * which can be passed to an external reader or instance.
  97          * <p>
  98          * Do <b>NOT</b> alter this file.
  99          *
 100          * @param luid
 101          *            the Library UID of the story
 102          * @param pg
 103          *            the optional {@link Progress}
 104          *
 105          * @return the corresponding {@link Story}
 106          *
 107          * @throws IOException
 108          *             in case of IOException
 109          */
 110         public abstract File getFile(String luid, Progress pg) throws IOException;
 111
 112         /**
 113          * Return the cover image associated to this story.
 114          *
 115          * @param luid
 116          *            the Library UID of the story
 117          *
 118          * @return the cover image
 119          *
 120          * @throws IOException
 121          *             in case of IOException
 122          */
 123         public abstract Image getCover(String luid) throws IOException;
 124
 125         /**
 126          * Return the cover image associated to this source.
 127          * <p>
 128          * By default, return the custom cover if any, and if not, return the cover
 129          * of the first story with this source.
 130          *
 131          * @param source
 132          *            the source
 133          *
 134          * @return the cover image or NULL
 135          *
 136          * @throws IOException
 137          *             in case of IOException
 138          */
 139         public Image getSourceCover(String source) throws IOException {
 140                 Image custom = getCustomSourceCover(source);
 141                 if (custom != null) {
 142                         return custom;
 143                 }
 144
 145                 List<MetaData> metas = getListBySource(source);
 146                 if (metas.size() > 0) {
 147                         return getCover(metas.get(0).getLuid());
 148                 }
 149
 150                 return null;
 151         }
 152
 153         /**
 154          * Return the cover image associated to this author.
 155          * <p>
 156          * By default, return the custom cover if any, and if not, return the cover
 157          * of the first story with this author.
 158          *
 159          * @param author
 160          *            the author
 161          *
 162          * @return the cover image or NULL
 163          *
 164          * @throws IOException
 165          *             in case of IOException
 166          */
 167         public Image getAuthorCover(String author) throws IOException {
 168                 Image custom = getCustomAuthorCover(author);
 169                 if (custom != null) {
 170                         return custom;
 171                 }
 172
 173                 List<MetaData> metas = getListByAuthor(author);
 174                 if (metas.size() > 0) {
 175                         return getCover(metas.get(0).getLuid());
 176                 }
 177
 178                 return null;
 179         }
 180
 181         /**
 182          * Return the custom cover image associated to this source.
 183          * <p>
 184          * By default, return NULL.
 185          *
 186          * @param source
 187          *            the source to look for
 188          *
 189          * @return the custom cover or NULL if none
 190          *
 191          * @throws IOException
 192          *             in case of IOException
 193          */
 194         @SuppressWarnings("unused")
 195         public Image getCustomSourceCover(String source) throws IOException {
 196                 return null;
 197         }
 198
 199         /**
 200          * Return the custom cover image associated to this author.
 201          * <p>
 202          * By default, return NULL.
 203          *
 204          * @param author
 205          *            the author to look for
 206          *
 207          * @return the custom cover or NULL if none
 208          *
 209          * @throws IOException
 210          *             in case of IOException
 211          */
 212         @SuppressWarnings("unused")
 213         public Image getCustomAuthorCover(String author) throws IOException {
 214                 return null;
 215         }
 216
 217         /**
 218          * Set the source cover to the given story cover.
 219          *
 220          * @param source
 221          *            the source to change
 222          * @param luid
 223          *            the story LUID
 224          *
 225          * @throws IOException
 226          *             in case of IOException
 227          */
 228         public abstract void setSourceCover(String source, String luid)
 229                         throws IOException;
 230
 231         /**
 232          * Set the author cover to the given story cover.
 233          *
 234          * @param author
 235          *            the author to change
 236          * @param luid
 237          *            the story LUID
 238          *
 239          * @throws IOException
 240          *             in case of IOException
 241          */
 242         public abstract void setAuthorCover(String author, String luid)
 243                         throws IOException;
 244
 245         /**
 246          * Return the list of stories (represented by their {@link MetaData}, which
 247          * <b>MAY</b> not have the cover included).
 248          *
 249          * @param pg
 250          *            the optional {@link Progress}
 251          *
 252          * @return the list (can be empty but not NULL)
 253          *
 254          * @throws IOException
 255          *             in case of IOException
 256          */
 257         protected abstract List<MetaData> getMetas(Progress pg) throws IOException;
 258
 259         /**
 260          * Invalidate the {@link Story} cache (when the content should be re-read
 261          * because it was changed).
 262          */
 263         protected void invalidateInfo() {
 264                 invalidateInfo(null);
 265         }
 266
 267         /**
 268          * Invalidate the {@link Story} cache (when the content is removed).
 269          * <p>
 270          * All the cache can be deleted if NULL is passed as meta.
 271          *
 272          * @param luid
 273          *            the LUID of the {@link Story} to clear from the cache, or NULL
 274          *            for all stories
 275          */
 276         protected abstract void invalidateInfo(String luid);
 277
 278         /**
 279          * Invalidate the {@link Story} cache (when the content has changed, but we
 280          * already have it) with the new given meta.
 281          *
 282          * @param meta
 283          *            the {@link Story} to clear from the cache
 284          *
 285          * @throws IOException
 286          *             in case of IOException
 287          */
 288         protected abstract void updateInfo(MetaData meta) throws IOException;
 289
 290         /**
 291          * Return the next LUID that can be used.
 292          *
 293          * @return the next luid
 294          */
 295         protected abstract int getNextId();
 296
 297         /**
 298          * Delete the target {@link Story}.
 299          *
 300          * @param luid
 301          *            the LUID of the {@link Story}
 302          *
 303          * @throws IOException
 304          *             in case of I/O error or if the {@link Story} wa not found
 305          */
 306         protected abstract void doDelete(String luid) throws IOException;
 307
 308         /**
 309          * Actually save the story to the back-end.
 310          *
 311          * @param story
 312          *            the {@link Story} to save
 313          * @param pg
 314          *            the optional {@link Progress}
 315          *
 316          * @return the saved {@link Story} (which may have changed, especially
 317          *         regarding the {@link MetaData})
 318          *
 319          * @throws IOException
 320          *             in case of I/O error
 321          */
 322         protected abstract Story doSave(Story story, Progress pg)
 323                         throws IOException;
 324
 325         /**
 326          * Refresh the {@link BasicLibrary}, that is, make sure all metas are
 327          * loaded.
 328          *
 329          * @param pg
 330          *            the optional progress reporter
 331          */
 332         public void refresh(Progress pg) {
 333                 try {
 334                         getMetas(pg);
 335                 } catch (IOException e) {
 336                         // We will let it fail later
 337                 }
 338         }
 339
 340         /**
 341          * List all the known types (sources) of stories.
 342          *
 343          * @return the sources
 344          *
 345          * @throws IOException
 346          *             in case of IOException
 347          */
 348         public synchronized List<String> getSources() throws IOException {
 349                 List<String> list = new ArrayList<String>();
 350                 for (MetaData meta : getMetas(null)) {
 351                         String storySource = meta.getSource();
 352                         if (!list.contains(storySource)) {
 353                                 list.add(storySource);
 354                         }
 355                 }
 356
 357                 Collections.sort(list);
 358                 return list;
 359         }
 360
 361         /**
 362          * List all the known types (sources) of stories, grouped by directory
 363          * ("Source_1/a" and "Source_1/b" will be grouped into "Source_1").
 364          * <p>
 365          * Note that an empty item in the list means a non-grouped source (type) --
 366          * e.g., you could have for Source_1:
 367          * <ul>
 368          * <li><tt></tt>: empty, so source is "Source_1"</li>
 369          * <li><tt>a</tt>: empty, so source is "Source_1/a"</li>
 370          * <li><tt>b</tt>: empty, so source is "Source_1/b"</li>
 371          * </ul>
 372          *
 373          * @return the grouped list
 374          *
 375          * @throws IOException
 376          *             in case of IOException
 377          */
 378         public synchronized Map<String, List<String>> getSourcesGrouped()
 379                         throws IOException {
 380                 Map<String, List<String>> map = new TreeMap<String, List<String>>();
 381                 for (String source : getSources()) {
 382                         String name;
 383                         String subname;
 384
 385                         int pos = source.indexOf('/');
 386                         if (pos > 0 && pos < source.length() - 1) {
 387                                 name = source.substring(0, pos);
 388                                 subname = source.substring(pos + 1);
 389
 390                         } else {
 391                                 name = source;
 392                                 subname = "";
 393                         }
 394
 395                         List<String> list = map.get(name);
 396                         if (list == null) {
 397                                 list = new ArrayList<String>();
 398                                 map.put(name, list);
 399                         }
 400                         list.add(subname);
 401                 }
 402
 403                 return map;
 404         }
 405
 406         /**
 407          * List all the known authors of stories.
 408          *
 409          * @return the authors
 410          *
 411          * @throws IOException
 412          *             in case of IOException
 413          */
 414         public synchronized List<String> getAuthors() throws IOException {
 415                 List<String> list = new ArrayList<String>();
 416                 for (MetaData meta : getMetas(null)) {
 417                         String storyAuthor = meta.getAuthor();
 418                         if (!list.contains(storyAuthor)) {
 419                                 list.add(storyAuthor);
 420                         }
 421                 }
 422
 423                 Collections.sort(list);
 424                 return list;
 425         }
 426
 427         /**
 428          * Return the list of authors, grouped by starting letter(s) if needed.
 429          * <p>
 430          * If the number of author is not too high, only one group with an empty
 431          * name and all the authors will be returned.
 432          * <p>
 433          * If not, the authors will be separated into groups:
 434          * <ul>
 435          * <li><tt>*</tt>: any author whose name doesn't contain letters nor numbers
 436          * </li>
 437          * <li><tt>0-9</tt>: any authors whose name starts with a number</li>
 438          * <li><tt>A-C</tt> (for instance): any author whose name starts with
 439          * <tt>A</tt>, <tt>B</tt> or <tt>C</tt></li>
 440          * </ul>
 441          * Note that the letters used in the groups can vary (except <tt>*</tt> and
 442          * <tt>0-9</tt>, which may only be present or not).
 443          *
 444          * @return the authors' names, grouped by letter(s)
 445          *
 446          * @throws IOException
 447          *             in case of IOException
 448          */
 449         public Map<String, List<String>> getAuthorsGrouped() throws IOException {
 450                 int MAX = 20;
 451
 452                 Map<String, List<String>> groups = new TreeMap<String, List<String>>();
 453                 List<String> authors = getAuthors();
 454
 455                 // If all authors fit the max, just report them as is
 456                 if (authors.size() <= MAX) {
 457                         groups.put("", authors);
 458                         return groups;
 459                 }
 460
 461                 // Create groups A to Z, which can be empty here
 462                 for (char car = 'A'; car <= 'Z'; car++) {
 463                         groups.put(Character.toString(car), getAuthorsGroup(authors, car));
 464                 }
 465
 466                 // Collapse them
 467                 List<String> keys = new ArrayList<String>(groups.keySet());
 468                 for (int i = 0; i + 1 < keys.size(); i++) {
 469                         String keyNow = keys.get(i);
 470                         String keyNext = keys.get(i + 1);
 471
 472                         List<String> now = groups.get(keyNow);
 473                         List<String> next = groups.get(keyNext);
 474
 475                         int currentTotal = now.size() + next.size();
 476                         if (currentTotal <= MAX) {
 477                                 String key = keyNow.charAt(0) + "-"
 478                                                 + keyNext.charAt(keyNext.length() - 1);
 479
 480                                 List<String> all = new ArrayList<String>();
 481                                 all.addAll(now);
 482                                 all.addAll(next);
 483
 484                                 groups.remove(keyNow);
 485                                 groups.remove(keyNext);
 486                                 groups.put(key, all);
 487
 488                                 keys.set(i, key); // set the new key instead of key(i)
 489                                 keys.remove(i + 1); // remove the next, consumed key
 490                                 i--; // restart at key(i)
 491                         }
 492                 }
 493
 494                 // Add "special" groups
 495                 groups.put("*", getAuthorsGroup(authors, '*'));
 496                 groups.put("0-9", getAuthorsGroup(authors, '0'));
 497
 498                 // Prune empty groups
 499                 keys = new ArrayList<String>(groups.keySet());
 500                 for (String key : keys) {
 501                         if (groups.get(key).isEmpty()) {
 502                                 groups.remove(key);
 503                         }
 504                 }
 505
 506                 return groups;
 507         }
 508
 509         /**
 510          * Get all the authors that start with the given character:
 511          * <ul>
 512          * <li><tt>*</tt>: any author whose name doesn't contain letters nor numbers
 513          * </li>
 514          * <li><tt>0</tt>: any authors whose name starts with a number</li>
 515          * <li><tt>A</tt> (any capital latin letter): any author whose name starts
 516          * with <tt>A</tt></li>
 517          * </ul>
 518          *
 519          * @param authors
 520          *            the full list of authors
 521          * @param car
 522          *            the starting character, <tt>*</tt>, <tt>0</tt> or a capital
 523          *            letter
 524          *
 525          * @return the authors that fulfil the starting letter
 526          */
 527         private List<String> getAuthorsGroup(List<String> authors, char car) {
 528                 List<String> accepted = new ArrayList<String>();
 529                 for (String author : authors) {
 530                         char first = '*';
 531                         for (int i = 0; first == '*' && i < author.length(); i++) {
 532                                 String san = StringUtils.sanitize(author, true, true);
 533                                 char c = san.charAt(i);
 534                                 if (c >= '0' && c <= '9') {
 535                                         first = '0';
 536                                 } else if (c >= 'a' && c <= 'z') {
 537                                         first = (char) (c - 'a' + 'A');
 538                                 } else if (c >= 'A' && c <= 'Z') {
 539                                         first = c;
 540                                 }
 541                         }
 542
 543                         if (first == car) {
 544                                 accepted.add(author);
 545                         }
 546                 }
 547
 548                 return accepted;
 549         }
 550
 551         /**
 552          * List all the stories in the {@link BasicLibrary}.
 553          * <p>
 554          * Cover images <b>MAYBE</b> not included.
 555          *
 556          * @return the stories
 557          *
 558          * @throws IOException
 559          *             in case of IOException
 560          */
 561         public synchronized List<MetaData> getList() throws IOException {
 562                 return getMetas(null);
 563         }
 564
 565         /**
 566          * List all the stories of the given source type in the {@link BasicLibrary}
 567          * , or all the stories if NULL is passed as a type.
 568          * <p>
 569          * Cover images not included.
 570          *
 571          * @param type
 572          *            the type of story to retrieve, or NULL for all
 573          *
 574          * @return the stories
 575          *
 576          * @throws IOException
 577          *             in case of IOException
 578          */
 579         public synchronized List<MetaData> getListBySource(String type)
 580                         throws IOException {
 581                 List<MetaData> list = new ArrayList<MetaData>();
 582                 for (MetaData meta : getMetas(null)) {
 583                         String storyType = meta.getSource();
 584                         if (type == null || type.equalsIgnoreCase(storyType)) {
 585                                 list.add(meta);
 586                         }
 587                 }
 588
 589                 Collections.sort(list);
 590                 return list;
 591         }
 592
 593         /**
 594          * List all the stories of the given author in the {@link BasicLibrary}, or
 595          * all the stories if NULL is passed as an author.
 596          * <p>
 597          * Cover images not included.
 598          *
 599          * @param author
 600          *            the author of the stories to retrieve, or NULL for all
 601          *
 602          * @return the stories
 603          *
 604          * @throws IOException
 605          *             in case of IOException
 606          */
 607         public synchronized List<MetaData> getListByAuthor(String author)
 608                         throws IOException {
 609                 List<MetaData> list = new ArrayList<MetaData>();
 610                 for (MetaData meta : getMetas(null)) {
 611                         String storyAuthor = meta.getAuthor();
 612                         if (author == null || author.equalsIgnoreCase(storyAuthor)) {
 613                                 list.add(meta);
 614                         }
 615                 }
 616
 617                 Collections.sort(list);
 618                 return list;
 619         }
 620
 621         /**
 622          * Retrieve a {@link MetaData} corresponding to the given {@link Story},
 623          * cover image <b>MAY</b> not be included.
 624          *
 625          * @param luid
 626          *            the Library UID of the story
 627          *
 628          * @return the corresponding {@link Story}
 629          *
 630          * @throws IOException
 631          *             in case of IOException
 632          */
 633         public synchronized MetaData getInfo(String luid) throws IOException {
 634                 if (luid != null) {
 635                         for (MetaData meta : getMetas(null)) {
 636                                 if (luid.equals(meta.getLuid())) {
 637                                         return meta;
 638                                 }
 639                         }
 640                 }
 641
 642                 return null;
 643         }
 644
 645         /**
 646          * Retrieve a specific {@link Story}.
 647          *
 648          * @param luid
 649          *            the Library UID of the story
 650          * @param pg
 651          *            the optional progress reporter
 652          *
 653          * @return the corresponding {@link Story} or NULL if not found
 654          *
 655          * @throws IOException
 656          *             in case of IOException
 657          */
 658         public synchronized Story getStory(String luid, Progress pg)
 659                         throws IOException {
 660                 Progress pgMetas = new Progress();
 661                 Progress pgStory = new Progress();
 662                 if (pg != null) {
 663                         pg.setMinMax(0, 100);
 664                         pg.addProgress(pgMetas, 10);
 665                         pg.addProgress(pgStory, 90);
 666                 }
 667
 668                 MetaData meta = null;
 669                 for (MetaData oneMeta : getMetas(pgMetas)) {
 670                         if (oneMeta.getLuid().equals(luid)) {
 671                                 meta = oneMeta;
 672                                 break;
 673                         }
 674                 }
 675
 676                 pgMetas.done();
 677
 678                 Story story = getStory(luid, meta, pgStory);
 679                 pgStory.done();
 680
 681                 return story;
 682         }
 683
 684         /**
 685          * Retrieve a specific {@link Story}.
 686          *
 687          * @param luid
 688          *            the meta of the story
 689          * @param pg
 690          *            the optional progress reporter
 691          *
 692          * @return the corresponding {@link Story} or NULL if not found
 693          *
 694          * @throws IOException
 695          *             in case of IOException
 696          */
 697         public synchronized Story getStory(String luid,
 698                         @SuppressWarnings("javadoc") MetaData meta, Progress pg)
 699                         throws IOException {
 700
 701                 if (pg == null) {
 702                         pg = new Progress();
 703                 }
 704
 705                 Progress pgGet = new Progress();
 706                 Progress pgProcess = new Progress();
 707
 708                 pg.setMinMax(0, 2);
 709                 pg.addProgress(pgGet, 1);
 710                 pg.addProgress(pgProcess, 1);
 711
 712                 Story story = null;
 713                 File file = getFile(luid, pgGet);
 714                 pgGet.done();
 715                 try {
 716                         SupportType type = SupportType.valueOfAllOkUC(meta.getType());
 717                         URL url = file.toURI().toURL();
 718                         if (type != null) {
 719                                 story = BasicSupport.getSupport(type, url) //
 720                                                 .process(pgProcess);
 721
 722                                 // Because we do not want to clear the meta cache:
 723                                 meta.setCover(story.getMeta().getCover());
 724                                 meta.setResume(story.getMeta().getResume());
 725                                 story.setMeta(meta);
 726                                 //
 727                         } else {
 728                                 throw new IOException("Unknown type: " + meta.getType());
 729                         }
 730                 } catch (IOException e) {
 731                         // We should not have not-supported files in the
 732                         // library
 733                         Instance.getInstance().getTraceHandler().error(new IOException(
 734                                         String.format("Cannot load file of type '%s' from library: %s", meta.getType(), file), e));
 735                 } finally {
 736                         pgProcess.done();
 737                         pg.done();
 738                 }
 739
 740                 return story;
 741         }
 742
 743         /**
 744          * Import the {@link Story} at the given {@link URL} into the
 745          * {@link BasicLibrary}.
 746          *
 747          * @param url
 748          *            the {@link URL} to import
 749          * @param pg
 750          *            the optional progress reporter
 751          *
 752          * @return the imported Story {@link MetaData}
 753          *
 754          * @throws UnknownHostException
 755          *             if the host is not supported
 756          * @throws IOException
 757          *             in case of I/O error
 758          */
 759         public MetaData imprt(URL url, Progress pg) throws IOException {
 760                 if (pg == null)
 761                         pg = new Progress();
 762
 763                 pg.setMinMax(0, 1000);
 764                 Progress pgProcess = new Progress();
 765                 Progress pgSave = new Progress();
 766                 pg.addProgress(pgProcess, 800);
 767                 pg.addProgress(pgSave, 200);
 768
 769                 BasicSupport support = BasicSupport.getSupport(url);
 770                 if (support == null) {
 771                         throw new UnknownHostException("" + url);
 772                 }
 773
 774                 Story story = save(support.process(pgProcess), pgSave);
 775                 pg.done();
 776
 777                 return story.getMeta();
 778         }
 779
 780         /**
 781          * Import the story from one library to another, and keep the same LUID.
 782          *
 783          * @param other
 784          *            the other library to import from
 785          * @param luid
 786          *            the Library UID
 787          * @param pg
 788          *            the optional progress reporter
 789          *
 790          * @throws IOException
 791          *             in case of I/O error
 792          */
 793         public void imprt(BasicLibrary other, String luid, Progress pg)
 794                         throws IOException {
 795                 Progress pgGetStory = new Progress();
 796                 Progress pgSave = new Progress();
 797                 if (pg == null) {
 798                         pg = new Progress();
 799                 }
 800
 801                 pg.setMinMax(0, 2);
 802                 pg.addProgress(pgGetStory, 1);
 803                 pg.addProgress(pgSave, 1);
 804
 805                 Story story = other.getStory(luid, pgGetStory);
 806                 if (story != null) {
 807                         story = this.save(story, luid, pgSave);
 808                         pg.done();
 809                 } else {
 810                         pg.done();
 811                         throw new IOException("Cannot find story in Library: " + luid);
 812                 }
 813         }
 814
 815         /**
 816          * Export the {@link Story} to the given target in the given format.
 817          *
 818          * @param luid
 819          *            the {@link Story} ID
 820          * @param type
 821          *            the {@link OutputType} to transform it to
 822          * @param target
 823          *            the target to save to
 824          * @param pg
 825          *            the optional progress reporter
 826          *
 827          * @return the saved resource (the main saved {@link File})
 828          *
 829          * @throws IOException
 830          *             in case of I/O error
 831          */
 832         public File export(String luid, OutputType type, String target, Progress pg)
 833                         throws IOException {
 834                 Progress pgGetStory = new Progress();
 835                 Progress pgOut = new Progress();
 836                 if (pg != null) {
 837                         pg.setMax(2);
 838                         pg.addProgress(pgGetStory, 1);
 839                         pg.addProgress(pgOut, 1);
 840                 }
 841
 842                 BasicOutput out = BasicOutput.getOutput(type, false, false);
 843                 if (out == null) {
 844                         throw new IOException("Output type not supported: " + type);
 845                 }
 846
 847                 Story story = getStory(luid, pgGetStory);
 848                 if (story == null) {
 849                         throw new IOException("Cannot find story to export: " + luid);
 850                 }
 851
 852                 return out.process(story, target, pgOut);
 853         }
 854
 855         /**
 856          * Save a {@link Story} to the {@link BasicLibrary}.
 857          *
 858          * @param story
 859          *            the {@link Story} to save
 860          * @param pg
 861          *            the optional progress reporter
 862          *
 863          * @return the same {@link Story}, whose LUID may have changed
 864          *
 865          * @throws IOException
 866          *             in case of I/O error
 867          */
 868         public Story save(Story story, Progress pg) throws IOException {
 869                 return save(story, null, pg);
 870         }
 871
 872         /**
 873          * Save a {@link Story} to the {@link BasicLibrary} -- the LUID <b>must</b>
 874          * be correct, or NULL to get the next free one.
 875          * <p>
 876          * Will override any previous {@link Story} with the same LUID.
 877          *
 878          * @param story
 879          *            the {@link Story} to save
 880          * @param luid
 881          *            the <b>correct</b> LUID or NULL to get the next free one
 882          * @param pg
 883          *            the optional progress reporter
 884          *
 885          * @return the same {@link Story}, whose LUID may have changed
 886          *
 887          * @throws IOException
 888          *             in case of I/O error
 889          */
 890         public synchronized Story save(Story story, String luid, Progress pg)
 891                         throws IOException {
 892
 893                 Instance.getInstance().getTraceHandler().trace(this.getClass().getSimpleName() + ": saving story " + luid);
 894
 895                 // Do not change the original metadata, but change the original story
 896                 MetaData meta = story.getMeta().clone();
 897                 story.setMeta(meta);
 898
 899                 if (luid == null || luid.isEmpty()) {
 900                         meta.setLuid(String.format("%03d", getNextId()));
 901                 } else {
 902                         meta.setLuid(luid);
 903                 }
 904
 905                 if (luid != null && getInfo(luid) != null) {
 906                         delete(luid);
 907                 }
 908
 909                 story = doSave(story, pg);
 910
 911                 updateInfo(story.getMeta());
 912
 913                 Instance.getInstance().getTraceHandler()
 914                                 .trace(this.getClass().getSimpleName() + ": story saved (" + luid + ")");
 915
 916                 return story;
 917         }
 918
 919         /**
 920          * Delete the given {@link Story} from this {@link BasicLibrary}.
 921          *
 922          * @param luid
 923          *            the LUID of the target {@link Story}
 924          *
 925          * @throws IOException
 926          *             in case of I/O error
 927          */
 928         public synchronized void delete(String luid) throws IOException {
 929                 Instance.getInstance().getTraceHandler().trace(this.getClass().getSimpleName() + ": deleting story " + luid);
 930
 931                 doDelete(luid);
 932                 invalidateInfo(luid);
 933
 934                 Instance.getInstance().getTraceHandler()
 935                                 .trace(this.getClass().getSimpleName() + ": story deleted (" + luid
 936                                                 + ")");
 937         }
 938
 939         /**
 940          * Change the type (source) of the given {@link Story}.
 941          *
 942          * @param luid
 943          *            the {@link Story} LUID
 944          * @param newSource
 945          *            the new source
 946          * @param pg
 947          *            the optional progress reporter
 948          *
 949          * @throws IOException
 950          *             in case of I/O error or if the {@link Story} was not found
 951          */
 952         public synchronized void changeSource(String luid, String newSource,
 953                         Progress pg) throws IOException {
 954                 MetaData meta = getInfo(luid);
 955                 if (meta == null) {
 956                         throw new IOException("Story not found: " + luid);
 957                 }
 958
 959                 changeSTA(luid, newSource, meta.getTitle(), meta.getAuthor(), pg);
 960         }
 961
 962         /**
 963          * Change the title (name) of the given {@link Story}.
 964          *
 965          * @param luid
 966          *            the {@link Story} LUID
 967          * @param newTitle
 968          *            the new title
 969          * @param pg
 970          *            the optional progress reporter
 971          *
 972          * @throws IOException
 973          *             in case of I/O error or if the {@link Story} was not found
 974          */
 975         public synchronized void changeTitle(String luid, String newTitle,
 976                         Progress pg) throws IOException {
 977                 MetaData meta = getInfo(luid);
 978                 if (meta == null) {
 979                         throw new IOException("Story not found: " + luid);
 980                 }
 981
 982                 changeSTA(luid, meta.getSource(), newTitle, meta.getAuthor(), pg);
 983         }
 984
 985         /**
 986          * Change the author of the given {@link Story}.
 987          *
 988          * @param luid
 989          *            the {@link Story} LUID
 990          * @param newAuthor
 991          *            the new author
 992          * @param pg
 993          *            the optional progress reporter
 994          *
 995          * @throws IOException
 996          *             in case of I/O error or if the {@link Story} was not found
 997          */
 998         public synchronized void changeAuthor(String luid, String newAuthor,
 999                         Progress pg) throws IOException {
1000                 MetaData meta = getInfo(luid);
1001                 if (meta == null) {
1002                         throw new IOException("Story not found: " + luid);
1003                 }
1004
1005                 changeSTA(luid, meta.getSource(), meta.getTitle(), newAuthor, pg);
1006         }
1007
1008         /**
1009          * Change the Source, Title and Author of the {@link Story} in one single
1010          * go.
1011          *
1012          * @param luid
1013          *            the {@link Story} LUID
1014          * @param newSource
1015          *            the new source
1016          * @param newTitle
1017          *            the new title
1018          * @param newAuthor
1019          *            the new author
1020          * @param pg
1021          *            the optional progress reporter
1022          *
1023          * @throws IOException
1024          *             in case of I/O error or if the {@link Story} was not found
1025          */
1026         protected synchronized void changeSTA(String luid, String newSource,
1027                         String newTitle, String newAuthor, Progress pg) throws IOException {
1028                 MetaData meta = getInfo(luid);
1029                 if (meta == null) {
1030                         throw new IOException("Story not found: " + luid);
1031                 }
1032
1033                 meta.setSource(newSource);
1034                 meta.setTitle(newTitle);
1035                 meta.setAuthor(newAuthor);
1036                 saveMeta(meta, pg);
1037
1038                 invalidateInfo(luid);
1039         }
1040
1041         /**
1042          * Save back the current state of the {@link MetaData} (LUID <b>MUST NOT</b>
1043          * change) for this {@link Story}.
1044          * <p>
1045          * By default, delete the old {@link Story} then recreate a new
1046          * {@link Story}.
1047          * <p>
1048          * Note that this behaviour can lead to data loss in case of problems!
1049          *
1050          * @param meta
1051          *            the new {@link MetaData} (LUID <b>MUST NOT</b> change)
1052          * @param pg
1053          *            the optional {@link Progress}
1054          *
1055          * @throws IOException
1056          *             in case of I/O error or if the {@link Story} was not found
1057          */
1058         protected synchronized void saveMeta(MetaData meta, Progress pg)
1059                         throws IOException {
1060                 if (pg == null) {
1061                         pg = new Progress();
1062                 }
1063
1064                 Progress pgGet = new Progress();
1065                 Progress pgSet = new Progress();
1066                 pg.addProgress(pgGet, 50);
1067                 pg.addProgress(pgSet, 50);
1068
1069                 Story story = getStory(meta.getLuid(), pgGet);
1070                 if (story == null) {
1071                         throw new IOException("Story not found: " + meta.getLuid());
1072                 }
1073
1074                 // TODO: this is not safe!
1075                 delete(meta.getLuid());
1076                 story.setMeta(meta);
1077                 save(story, meta.getLuid(), pgSet);
1078
1079                 pg.done();
1080         }
1081 }