src/main/java/net/pterodactylus/sone/web/SearchPage.java

   1 /*
   2  * Sone - SearchPage.java - Copyright © 2010–2016 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.sone.web;
  19
  20 import static com.google.common.base.Optional.fromNullable;
  21 import static com.google.common.primitives.Ints.tryParse;
  22 import static java.util.logging.Logger.getLogger;
  23
  24 import java.util.ArrayList;
  25 import java.util.Collection;
  26 import java.util.Collections;
  27 import java.util.Comparator;
  28 import java.util.HashSet;
  29 import java.util.List;
  30 import java.util.Set;
  31 import java.util.concurrent.TimeUnit;
  32 import java.util.logging.Level;
  33 import java.util.logging.Logger;
  34
  35 import net.pterodactylus.sone.data.Post;
  36 import net.pterodactylus.sone.data.PostReply;
  37 import net.pterodactylus.sone.data.Profile;
  38 import net.pterodactylus.sone.data.Profile.Field;
  39 import net.pterodactylus.sone.data.Reply;
  40 import net.pterodactylus.sone.data.Sone;
  41 import net.pterodactylus.sone.web.page.FreenetRequest;
  42 import net.pterodactylus.util.collection.Pagination;
  43 import net.pterodactylus.util.template.Template;
  44 import net.pterodactylus.util.template.TemplateContext;
  45 import net.pterodactylus.util.text.StringEscaper;
  46 import net.pterodactylus.util.text.TextException;
  47
  48 import com.google.common.base.Function;
  49 import com.google.common.base.Optional;
  50 import com.google.common.base.Predicate;
  51 import com.google.common.cache.CacheBuilder;
  52 import com.google.common.cache.CacheLoader;
  53 import com.google.common.cache.LoadingCache;
  54 import com.google.common.collect.Collections2;
  55 import com.google.common.collect.FluentIterable;
  56 import com.google.common.collect.Ordering;
  57
  58 /**
  59  * This page lets the user search for posts and replies that contain certain
  60  * words.
  61  *
  62  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  63  */
  64 public class SearchPage extends SoneTemplatePage {
  65
  66         /** The logger. */
  67         private static final Logger logger = getLogger(SearchPage.class.getName());
  68
  69         /** Short-term cache. */
  70         private final LoadingCache<List<Phrase>, Set<Hit<Post>>> hitCache = CacheBuilder.newBuilder().expireAfterWrite(5, TimeUnit.MINUTES).build(new CacheLoader<List<Phrase>, Set<Hit<Post>>>() {
  71
  72                 @Override
  73                 @SuppressWarnings("synthetic-access")
  74                 public Set<Hit<Post>> load(List<Phrase> phrases) {
  75                         Set<Post> posts = new HashSet<Post>();
  76                         for (Sone sone : webInterface.getCore().getSones()) {
  77                                 posts.addAll(sone.getPosts());
  78                         }
  79                         return getHits(Collections2.filter(posts, Post.FUTURE_POSTS_FILTER), phrases, new PostStringGenerator());
  80                 }
  81         });
  82
  83         /**
  84          * Creates a new search page.
  85          *
  86          * @param template
  87          *            The template to render
  88          * @param webInterface
  89          *            The Sone web interface
  90          */
  91         public SearchPage(Template template, WebInterface webInterface) {
  92                 super("search.html", template, "Page.Search.Title", webInterface);
  93         }
  94
  95         //
  96         // SONETEMPLATEPAGE METHODS
  97         //
  98
  99         /**
 100          * {@inheritDoc}
 101          */
 102         @Override
 103         @SuppressWarnings("synthetic-access")
 104         protected void handleRequest(FreenetRequest request, TemplateContext templateContext) throws RedirectException {
 105                 String query = request.getHttpRequest().getParam("query").trim();
 106                 if (query.length() == 0) {
 107                         throw new RedirectException("index.html");
 108                 }
 109
 110                 List<Phrase> phrases = parseSearchPhrases(query);
 111                 if (phrases.isEmpty()) {
 112                         throw new RedirectException("index.html");
 113                 }
 114
 115                 /* check for a couple of shortcuts. */
 116                 if (phrases.size() == 1) {
 117                         String phrase = phrases.get(0).getPhrase();
 118
 119                         /* is it a Sone ID? */
 120                         redirectIfNotNull(getSoneId(phrase), "viewSone.html?sone=");
 121
 122                         /* is it a post ID? */
 123                         redirectIfNotNull(getPostId(phrase), "viewPost.html?post=");
 124
 125                         /* is it a reply ID? show the post. */
 126                         redirectIfNotNull(getReplyPostId(phrase), "viewPost.html?post=");
 127
 128                         /* is it an album ID? */
 129                         redirectIfNotNull(getAlbumId(phrase), "imageBrowser.html?album=");
 130
 131                         /* is it an image ID? */
 132                         redirectIfNotNull(getImageId(phrase), "imageBrowser.html?image=");
 133                 }
 134
 135                 Collection<Sone> sones = webInterface.getCore().getSones();
 136                 Collection<Hit<Sone>> soneHits = getHits(sones, phrases, SoneStringGenerator.COMPLETE_GENERATOR);
 137
 138                 Collection<Hit<Post>> postHits = hitCache.getUnchecked(phrases);
 139
 140                 /* now filter. */
 141                 soneHits = Collections2.filter(soneHits, Hit.POSITIVE_FILTER);
 142                 postHits = Collections2.filter(postHits, Hit.POSITIVE_FILTER);
 143
 144                 /* now sort. */
 145                 List<Hit<Sone>> sortedSoneHits = Ordering.from(Hit.DESCENDING_COMPARATOR).sortedCopy(soneHits);
 146                 List<Hit<Post>> sortedPostHits = Ordering.from(Hit.DESCENDING_COMPARATOR).sortedCopy(postHits);
 147
 148                 /* extract Sones and posts. */
 149                 List<Sone> resultSones = FluentIterable.from(sortedSoneHits).transform(new HitMapper<Sone>()).toList();
 150                 List<Post> resultPosts = FluentIterable.from(sortedPostHits).transform(new HitMapper<Post>()).toList();
 151
 152                 /* pagination. */
 153                 Pagination<Sone> sonePagination = new Pagination<Sone>(resultSones, webInterface.getCore().getPreferences().getPostsPerPage()).setPage(fromNullable(tryParse(request.getHttpRequest().getParam("sonePage"))).or(0));
 154                 Pagination<Post> postPagination = new Pagination<Post>(resultPosts, webInterface.getCore().getPreferences().getPostsPerPage()).setPage(fromNullable(tryParse(request.getHttpRequest().getParam("postPage"))).or(0));
 155
 156                 templateContext.set("sonePagination", sonePagination);
 157                 templateContext.set("soneHits", sonePagination.getItems());
 158                 templateContext.set("postPagination", postPagination);
 159                 templateContext.set("postHits", postPagination.getItems());
 160         }
 161
 162         //
 163         // PRIVATE METHODS
 164         //
 165
 166         /**
 167          * Collects hit information for the given objects. The objects are converted
 168          * to a {@link String} using the given {@link StringGenerator}, and the
 169          * {@link #calculateScore(List, String) calculated score} is stored together
 170          * with the object in a {@link Hit}, and all resulting {@link Hit}s are then
 171          * returned.
 172          *
 173          * @param <T>
 174          *            The type of the objects
 175          * @param objects
 176          *            The objects to search over
 177          * @param phrases
 178          *            The phrases to search for
 179          * @param stringGenerator
 180          *            The string generator for the objects
 181          * @return The hits for the given phrases
 182          */
 183         private static <T> Set<Hit<T>> getHits(Collection<T> objects, List<Phrase> phrases, StringGenerator<T> stringGenerator) {
 184                 Set<Hit<T>> hits = new HashSet<Hit<T>>();
 185                 for (T object : objects) {
 186                         String objectString = stringGenerator.generateString(object);
 187                         double score = calculateScore(phrases, objectString);
 188                         hits.add(new Hit<T>(object, score));
 189                 }
 190                 return hits;
 191         }
 192
 193         /**
 194          * Parses the given query into search phrases. The query is split on
 195          * whitespace while allowing to group words using single or double quotes.
 196          * Isolated phrases starting with a “+” are
 197          * {@link Phrase.Optionality#REQUIRED}, phrases with a “-” are
 198          * {@link Phrase.Optionality#FORBIDDEN}.
 199          *
 200          * @param query
 201          *            The query to parse
 202          * @return The parsed phrases
 203          */
 204         private static List<Phrase> parseSearchPhrases(String query) {
 205                 List<String> parsedPhrases;
 206                 try {
 207                         parsedPhrases = StringEscaper.parseLine(query);
 208                 } catch (TextException te1) {
 209                         /* invalid query. */
 210                         return Collections.emptyList();
 211                 }
 212
 213                 List<Phrase> phrases = new ArrayList<Phrase>();
 214                 for (String phrase : parsedPhrases) {
 215                         if (phrase.startsWith("+")) {
 216                                 if (phrase.length() > 1) {
 217                                         phrases.add(new Phrase(phrase.substring(1), Phrase.Optionality.REQUIRED));
 218                                 } else {
 219                                         phrases.add(new Phrase("+", Phrase.Optionality.OPTIONAL));
 220                                 }
 221                         } else if (phrase.startsWith("-")) {
 222                                 if (phrase.length() > 1) {
 223                                         phrases.add(new Phrase(phrase.substring(1), Phrase.Optionality.FORBIDDEN));
 224                                 } else {
 225                                         phrases.add(new Phrase("-", Phrase.Optionality.OPTIONAL));
 226                                 }
 227                         } else {
 228                                 phrases.add(new Phrase(phrase, Phrase.Optionality.OPTIONAL));
 229                         }
 230                 }
 231                 return phrases;
 232         }
 233
 234         /**
 235          * Calculates the score for the given expression when using the given
 236          * phrases.
 237          *
 238          * @param phrases
 239          *            The phrases to search for
 240          * @param expression
 241          *            The expression to search
 242          * @return The score of the expression
 243          */
 244         private static double calculateScore(List<Phrase> phrases, String expression) {
 245                 logger.log(Level.FINEST, String.format("Calculating Score for “%s”…", expression));
 246                 double optionalHits = 0;
 247                 double requiredHits = 0;
 248                 int forbiddenHits = 0;
 249                 int requiredPhrases = 0;
 250                 for (Phrase phrase : phrases) {
 251                         String phraseString = phrase.getPhrase().toLowerCase();
 252                         if (phrase.getOptionality() == Phrase.Optionality.REQUIRED) {
 253                                 ++requiredPhrases;
 254                         }
 255                         int matches = 0;
 256                         int index = 0;
 257                         double score = 0;
 258                         while (index < expression.length()) {
 259                                 int position = expression.toLowerCase().indexOf(phraseString, index);
 260                                 if (position == -1) {
 261                                         break;
 262                                 }
 263                                 score += Math.pow(1 - position / (double) expression.length(), 2);
 264                                 index = position + phraseString.length();
 265                                 logger.log(Level.FINEST, String.format("Got hit at position %d.", position));
 266                                 ++matches;
 267                         }
 268                         logger.log(Level.FINEST, String.format("Score: %f", score));
 269                         if (matches == 0) {
 270                                 continue;
 271                         }
 272                         if (phrase.getOptionality() == Phrase.Optionality.REQUIRED) {
 273                                 requiredHits += score;
 274                         }
 275                         if (phrase.getOptionality() == Phrase.Optionality.OPTIONAL) {
 276                                 optionalHits += score;
 277                         }
 278                         if (phrase.getOptionality() == Phrase.Optionality.FORBIDDEN) {
 279                                 forbiddenHits += matches;
 280                         }
 281                 }
 282                 return requiredHits * 3 + optionalHits + (requiredHits - requiredPhrases) * 5 - (forbiddenHits * 2);
 283         }
 284
 285         /**
 286          * Throws a
 287          * {@link net.pterodactylus.sone.web.page.FreenetTemplatePage.RedirectException}
 288          * if the given object is not {@code null}, appending the object to the
 289          * given target URL.
 290          *
 291          * @param object
 292          *            The object on which to redirect
 293          * @param target
 294          *            The target of the redirect
 295          * @throws RedirectException
 296          *             if {@code object} is not {@code null}
 297          */
 298         private static void redirectIfNotNull(String object, String target) throws RedirectException {
 299                 if (object != null) {
 300                         throw new RedirectException(target + object);
 301                 }
 302         }
 303
 304         /**
 305          * If the given phrase contains a Sone ID (optionally prefixed by
 306          * “sone://”), returns said Sone ID, otherwise return {@code null}.
 307          *
 308          * @param phrase
 309          *            The phrase that maybe is a Sone ID
 310          * @return The Sone ID, or {@code null}
 311          */
 312         private String getSoneId(String phrase) {
 313                 String soneId = phrase.startsWith("sone://") ? phrase.substring(7) : phrase;
 314                 return (webInterface.getCore().getSone(soneId).isPresent()) ? soneId : null;
 315         }
 316
 317         /**
 318          * If the given phrase contains a post ID (optionally prefixed by
 319          * “post://”), returns said post ID, otherwise return {@code null}.
 320          *
 321          * @param phrase
 322          *            The phrase that maybe is a post ID
 323          * @return The post ID, or {@code null}
 324          */
 325         private String getPostId(String phrase) {
 326                 String postId = phrase.startsWith("post://") ? phrase.substring(7) : phrase;
 327                 return (webInterface.getCore().getPost(postId).isPresent()) ? postId : null;
 328         }
 329
 330         /**
 331          * If the given phrase contains a reply ID (optionally prefixed by
 332          * “reply://”), returns the ID of the post the reply belongs to, otherwise
 333          * return {@code null}.
 334          *
 335          * @param phrase
 336          *            The phrase that maybe is a reply ID
 337          * @return The reply’s post ID, or {@code null}
 338          */
 339         private String getReplyPostId(String phrase) {
 340                 String replyId = phrase.startsWith("reply://") ? phrase.substring(8) : phrase;
 341                 Optional<PostReply> postReply = webInterface.getCore().getPostReply(replyId);
 342                 if (!postReply.isPresent()) {
 343                         return null;
 344                 }
 345                 return postReply.get().getPostId();
 346         }
 347
 348         /**
 349          * If the given phrase contains an album ID (optionally prefixed by
 350          * “album://”), returns said album ID, otherwise return {@code null}.
 351          *
 352          * @param phrase
 353          *            The phrase that maybe is an album ID
 354          * @return The album ID, or {@code null}
 355          */
 356         private String getAlbumId(String phrase) {
 357                 String albumId = phrase.startsWith("album://") ? phrase.substring(8) : phrase;
 358                 return (webInterface.getCore().getAlbum(albumId) != null) ? albumId : null;
 359         }
 360
 361         /**
 362          * If the given phrase contains an image ID (optionally prefixed by
 363          * “image://”), returns said image ID, otherwise return {@code null}.
 364          *
 365          * @param phrase
 366          *            The phrase that maybe is an image ID
 367          * @return The image ID, or {@code null}
 368          */
 369         private String getImageId(String phrase) {
 370                 String imageId = phrase.startsWith("image://") ? phrase.substring(8) : phrase;
 371                 return (webInterface.getCore().getImage(imageId, false) != null) ? imageId : null;
 372         }
 373
 374         /**
 375          * Converts a given object into a {@link String}.
 376          *
 377          * @param <T>
 378          *            The type of the objects
 379          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 380          */
 381         private static interface StringGenerator<T> {
 382
 383                 /**
 384                  * Generates a {@link String} for the given object.
 385                  *
 386                  * @param object
 387                  *            The object to generate the {@link String} for
 388                  * @return The generated {@link String}
 389                  */
 390                 public String generateString(T object);
 391
 392         }
 393
 394         /**
 395          * Generates a {@link String} from a {@link Sone}, concatenating the name of
 396          * the Sone and all {@link Profile} {@link Field} values.
 397          *
 398          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 399          */
 400         private static class SoneStringGenerator implements StringGenerator<Sone> {
 401
 402                 /** A static instance of a complete Sone string generator. */
 403                 public static final SoneStringGenerator COMPLETE_GENERATOR = new SoneStringGenerator(true);
 404
 405                 /**
 406                  * A static instance of a Sone string generator that will only use the
 407                  * name of the Sone.
 408                  */
 409                 public static final SoneStringGenerator NAME_GENERATOR = new SoneStringGenerator(false);
 410
 411                 /** Whether to generate a string from all data of a Sone. */
 412                 private final boolean complete;
 413
 414                 /**
 415                  * Creates a new Sone string generator.
 416                  *
 417                  * @param complete
 418                  *            {@code true} to use the profile’s fields, {@code false} to
 419                  *            not to use the profile‘s fields
 420                  */
 421                 private SoneStringGenerator(boolean complete) {
 422                         this.complete = complete;
 423                 }
 424
 425                 /**
 426                  * {@inheritDoc}
 427                  */
 428                 @Override
 429                 public String generateString(Sone sone) {
 430                         StringBuilder soneString = new StringBuilder();
 431                         soneString.append(sone.getName());
 432                         Profile soneProfile = sone.getProfile();
 433                         if (soneProfile.getFirstName() != null) {
 434                                 soneString.append(' ').append(soneProfile.getFirstName());
 435                         }
 436                         if (soneProfile.getMiddleName() != null) {
 437                                 soneString.append(' ').append(soneProfile.getMiddleName());
 438                         }
 439                         if (soneProfile.getLastName() != null) {
 440                                 soneString.append(' ').append(soneProfile.getLastName());
 441                         }
 442                         if (complete) {
 443                                 for (Field field : soneProfile.getFields()) {
 444                                         soneString.append(' ').append(field.getValue());
 445                                 }
 446                         }
 447                         return soneString.toString();
 448                 }
 449
 450         }
 451
 452         /**
 453          * Generates a {@link String} from a {@link Post}, concatenating the text of
 454          * the post, the text of all {@link Reply}s, and the name of all
 455          * {@link Sone}s that have replied.
 456          *
 457          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 458          */
 459         private class PostStringGenerator implements StringGenerator<Post> {
 460
 461                 /**
 462                  * {@inheritDoc}
 463                  */
 464                 @Override
 465                 public String generateString(Post post) {
 466                         StringBuilder postString = new StringBuilder();
 467                         postString.append(post.getText());
 468                         if (post.getRecipient().isPresent()) {
 469                                 postString.append(' ').append(SoneStringGenerator.NAME_GENERATOR.generateString(post.getRecipient().get()));
 470                         }
 471                         for (PostReply reply : Collections2.filter(webInterface.getCore().getReplies(post.getId()), Reply.FUTURE_REPLY_FILTER)) {
 472                                 postString.append(' ').append(SoneStringGenerator.NAME_GENERATOR.generateString(reply.getSone()));
 473                                 postString.append(' ').append(reply.getText());
 474                         }
 475                         return postString.toString();
 476                 }
 477
 478         }
 479
 480         /**
 481          * A search phrase.
 482          *
 483          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 484          */
 485         private static class Phrase {
 486
 487                 /**
 488                  * The optionality of a search phrase.
 489                  *
 490                  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’
 491                  *         Roden</a>
 492                  */
 493                 public enum Optionality {
 494
 495                         /** The phrase is optional. */
 496                         OPTIONAL,
 497
 498                         /** The phrase is required. */
 499                         REQUIRED,
 500
 501                         /** The phrase is forbidden. */
 502                         FORBIDDEN
 503
 504                 }
 505
 506                 /** The phrase to search for. */
 507                 private final String phrase;
 508
 509                 /** The optionality of the phrase. */
 510                 private final Optionality optionality;
 511
 512                 /**
 513                  * Creates a new phrase.
 514                  *
 515                  * @param phrase
 516                  *            The phrase to search for
 517                  * @param optionality
 518                  *            The optionality of the phrase
 519                  */
 520                 public Phrase(String phrase, Optionality optionality) {
 521                         this.optionality = optionality;
 522                         this.phrase = phrase;
 523                 }
 524
 525                 /**
 526                  * Returns the phrase to search for.
 527                  *
 528                  * @return The phrase to search for
 529                  */
 530                 public String getPhrase() {
 531                         return phrase;
 532                 }
 533
 534                 /**
 535                  * Returns the optionality of the phrase.
 536                  *
 537                  * @return The optionality of the phrase
 538                  */
 539                 public Optionality getOptionality() {
 540                         return optionality;
 541                 }
 542
 543                 //
 544                 // OBJECT METHODS
 545                 //
 546
 547                 /**
 548                  * {@inheritDoc}
 549                  */
 550                 @Override
 551                 public int hashCode() {
 552                         return phrase.hashCode() ^ ((optionality == Optionality.FORBIDDEN) ? (0xaaaaaaaa) : ((optionality == Optionality.REQUIRED) ? 0x55555555 : 0));
 553                 }
 554
 555                 /**
 556                  * {@inheritDoc}
 557                  */
 558                 @Override
 559                 public boolean equals(Object object) {
 560                         if (!(object instanceof Phrase)) {
 561                                 return false;
 562                         }
 563                         Phrase phrase = (Phrase) object;
 564                         return (this.optionality == phrase.optionality) && this.phrase.equals(phrase.phrase);
 565                 }
 566
 567         }
 568
 569         /**
 570          * A hit consists of a searched object and the score it got for the phrases
 571          * of the search.
 572          *
 573          * @see SearchPage#calculateScore(List, String)
 574          * @param <T>
 575          *            The type of the searched object
 576          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 577          */
 578         private static class Hit<T> {
 579
 580                 /** Filter for {@link Hit}s with a score of more than 0. */
 581                 public static final Predicate<Hit<?>> POSITIVE_FILTER = new Predicate<Hit<?>>() {
 582
 583                         @Override
 584                         public boolean apply(Hit<?> hit) {
 585                                 return (hit != null) && (hit.getScore() > 0);
 586                         }
 587
 588                 };
 589
 590                 /** Comparator that sorts {@link Hit}s descending by score. */
 591                 public static final Comparator<Hit<?>> DESCENDING_COMPARATOR = new Comparator<Hit<?>>() {
 592
 593                         @Override
 594                         public int compare(Hit<?> leftHit, Hit<?> rightHit) {
 595                                 return Double.compare(rightHit.getScore(), leftHit.getScore());
 596                         }
 597
 598                 };
 599
 600                 /** The object that was searched. */
 601                 private final T object;
 602
 603                 /** The score of the object. */
 604                 private final double score;
 605
 606                 /**
 607                  * Creates a new hit.
 608                  *
 609                  * @param object
 610                  *            The object that was searched
 611                  * @param score
 612                  *            The score of the object
 613                  */
 614                 public Hit(T object, double score) {
 615                         this.object = object;
 616                         this.score = score;
 617                 }
 618
 619                 /**
 620                  * Returns the object that was searched.
 621                  *
 622                  * @return The object that was searched
 623                  */
 624                 public T getObject() {
 625                         return object;
 626                 }
 627
 628                 /**
 629                  * Returns the score of the object.
 630                  *
 631                  * @return The score of the object
 632                  */
 633                 public double getScore() {
 634                         return score;
 635                 }
 636
 637         }
 638
 639         /**
 640          * Extracts the object from a {@link Hit}.
 641          *
 642          * @param <T>
 643          *            The type of the object to extract
 644          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 645          */
 646         private static class HitMapper<T> implements Function<Hit<T>, T> {
 647
 648                 /**
 649                  * {@inheritDoc}
 650                  */
 651                 @Override
 652                 public T apply(Hit<T> input) {
 653                         return input.getObject();
 654                 }
 655
 656         }
 657
 658 }