src/main/java/net/pterodactylus/sone/web/pages/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.pages;
  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.utils.Pagination;
  42 import net.pterodactylus.sone.web.WebInterface;
  43 import net.pterodactylus.sone.web.page.FreenetRequest;
  44 import net.pterodactylus.util.template.Template;
  45 import net.pterodactylus.util.template.TemplateContext;
  46 import net.pterodactylus.util.text.StringEscaper;
  47 import net.pterodactylus.util.text.TextException;
  48
  49 import com.google.common.base.Function;
  50 import com.google.common.base.Optional;
  51 import com.google.common.base.Predicate;
  52 import com.google.common.cache.CacheBuilder;
  53 import com.google.common.cache.CacheLoader;
  54 import com.google.common.cache.LoadingCache;
  55 import com.google.common.collect.Collections2;
  56 import com.google.common.collect.FluentIterable;
  57 import com.google.common.collect.Ordering;
  58
  59 /**
  60  * This page lets the user search for posts and replies that contain certain
  61  * words.
  62  *
  63  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  64  */
  65 public class SearchPage extends SoneTemplatePage {
  66
  67         /** The logger. */
  68         private static final Logger logger = getLogger(SearchPage.class.getName());
  69
  70         /** Short-term cache. */
  71         private final LoadingCache<List<Phrase>, Set<Hit<Post>>> hitCache = CacheBuilder.newBuilder().expireAfterWrite(5, TimeUnit.MINUTES).build(new CacheLoader<List<Phrase>, Set<Hit<Post>>>() {
  72
  73                 @Override
  74                 @SuppressWarnings("synthetic-access")
  75                 public Set<Hit<Post>> load(List<Phrase> phrases) {
  76                         Set<Post> posts = new HashSet<Post>();
  77                         for (Sone sone : webInterface.getCore().getSones()) {
  78                                 posts.addAll(sone.getPosts());
  79                         }
  80                         return getHits(Collections2.filter(posts, Post.FUTURE_POSTS_FILTER), phrases, new PostStringGenerator());
  81                 }
  82         });
  83
  84         /**
  85          * Creates a new search page.
  86          *
  87          * @param template
  88          *            The template to render
  89          * @param webInterface
  90          *            The Sone web interface
  91          */
  92         public SearchPage(Template template, WebInterface webInterface) {
  93                 super("search.html", template, "Page.Search.Title", webInterface);
  94         }
  95
  96         //
  97         // SONETEMPLATEPAGE METHODS
  98         //
  99
 100         /**
 101          * {@inheritDoc}
 102          */
 103         @Override
 104         @SuppressWarnings("synthetic-access")
 105         protected void handleRequest(FreenetRequest request, TemplateContext templateContext) throws RedirectException {
 106                 String query = request.getHttpRequest().getParam("query").trim();
 107                 if (query.length() == 0) {
 108                         throw new RedirectException("index.html");
 109                 }
 110
 111                 List<Phrase> phrases = parseSearchPhrases(query);
 112                 if (phrases.isEmpty()) {
 113                         throw new RedirectException("index.html");
 114                 }
 115
 116                 /* check for a couple of shortcuts. */
 117                 if (phrases.size() == 1) {
 118                         String phrase = phrases.get(0).getPhrase();
 119
 120                         /* is it a Sone ID? */
 121                         redirectIfNotNull(getSoneId(phrase), "viewSone.html?sone=");
 122
 123                         /* is it a post ID? */
 124                         redirectIfNotNull(getPostId(phrase), "viewPost.html?post=");
 125
 126                         /* is it a reply ID? show the post. */
 127                         redirectIfNotNull(getReplyPostId(phrase), "viewPost.html?post=");
 128
 129                         /* is it an album ID? */
 130                         redirectIfNotNull(getAlbumId(phrase), "imageBrowser.html?album=");
 131
 132                         /* is it an image ID? */
 133                         redirectIfNotNull(getImageId(phrase), "imageBrowser.html?image=");
 134                 }
 135
 136                 Collection<Sone> sones = webInterface.getCore().getSones();
 137                 Collection<Hit<Sone>> soneHits = getHits(sones, phrases, SoneStringGenerator.COMPLETE_GENERATOR);
 138
 139                 Collection<Hit<Post>> postHits = hitCache.getUnchecked(phrases);
 140
 141                 /* now filter. */
 142                 soneHits = Collections2.filter(soneHits, Hit.POSITIVE_FILTER);
 143                 postHits = Collections2.filter(postHits, Hit.POSITIVE_FILTER);
 144
 145                 /* now sort. */
 146                 List<Hit<Sone>> sortedSoneHits = Ordering.from(Hit.DESCENDING_COMPARATOR).sortedCopy(soneHits);
 147                 List<Hit<Post>> sortedPostHits = Ordering.from(Hit.DESCENDING_COMPARATOR).sortedCopy(postHits);
 148
 149                 /* extract Sones and posts. */
 150                 List<Sone> resultSones = FluentIterable.from(sortedSoneHits).transform(new HitMapper<Sone>()).toList();
 151                 List<Post> resultPosts = FluentIterable.from(sortedPostHits).transform(new HitMapper<Post>()).toList();
 152
 153                 /* pagination. */
 154                 Pagination<Sone> sonePagination = new Pagination<Sone>(resultSones, webInterface.getCore().getPreferences().getPostsPerPage());
 155                 sonePagination.setPage(fromNullable(tryParse(request.getHttpRequest().getParam("sonePage"))).or(0));
 156                 Pagination<Post> postPagination = new Pagination<Post>(resultPosts, webInterface.getCore().getPreferences().getPostsPerPage());
 157                 postPagination.setPage(fromNullable(tryParse(request.getHttpRequest().getParam("postPage"))).or(0));
 158
 159                 templateContext.set("sonePagination", sonePagination);
 160                 templateContext.set("soneHits", sonePagination.getItems());
 161                 templateContext.set("postPagination", postPagination);
 162                 templateContext.set("postHits", postPagination.getItems());
 163         }
 164
 165         //
 166         // PRIVATE METHODS
 167         //
 168
 169         /**
 170          * Collects hit information for the given objects. The objects are converted
 171          * to a {@link String} using the given {@link StringGenerator}, and the
 172          * {@link #calculateScore(List, String) calculated score} is stored together
 173          * with the object in a {@link Hit}, and all resulting {@link Hit}s are then
 174          * returned.
 175          *
 176          * @param <T>
 177          *            The type of the objects
 178          * @param objects
 179          *            The objects to search over
 180          * @param phrases
 181          *            The phrases to search for
 182          * @param stringGenerator
 183          *            The string generator for the objects
 184          * @return The hits for the given phrases
 185          */
 186         private static <T> Set<Hit<T>> getHits(Collection<T> objects, List<Phrase> phrases, StringGenerator<T> stringGenerator) {
 187                 Set<Hit<T>> hits = new HashSet<Hit<T>>();
 188                 for (T object : objects) {
 189                         String objectString = stringGenerator.generateString(object);
 190                         double score = calculateScore(phrases, objectString);
 191                         hits.add(new Hit<T>(object, score));
 192                 }
 193                 return hits;
 194         }
 195
 196         /**
 197          * Parses the given query into search phrases. The query is split on
 198          * whitespace while allowing to group words using single or double quotes.
 199          * Isolated phrases starting with a “+” are
 200          * {@link Phrase.Optionality#REQUIRED}, phrases with a “-” are
 201          * {@link Phrase.Optionality#FORBIDDEN}.
 202          *
 203          * @param query
 204          *            The query to parse
 205          * @return The parsed phrases
 206          */
 207         private static List<Phrase> parseSearchPhrases(String query) {
 208                 List<String> parsedPhrases;
 209                 try {
 210                         parsedPhrases = StringEscaper.parseLine(query);
 211                 } catch (TextException te1) {
 212                         /* invalid query. */
 213                         return Collections.emptyList();
 214                 }
 215
 216                 List<Phrase> phrases = new ArrayList<Phrase>();
 217                 for (String phrase : parsedPhrases) {
 218                         if (phrase.startsWith("+")) {
 219                                 if (phrase.length() > 1) {
 220                                         phrases.add(new Phrase(phrase.substring(1), Phrase.Optionality.REQUIRED));
 221                                 } else {
 222                                         phrases.add(new Phrase("+", Phrase.Optionality.OPTIONAL));
 223                                 }
 224                         } else if (phrase.startsWith("-")) {
 225                                 if (phrase.length() > 1) {
 226                                         phrases.add(new Phrase(phrase.substring(1), Phrase.Optionality.FORBIDDEN));
 227                                 } else {
 228                                         phrases.add(new Phrase("-", Phrase.Optionality.OPTIONAL));
 229                                 }
 230                         } else {
 231                                 phrases.add(new Phrase(phrase, Phrase.Optionality.OPTIONAL));
 232                         }
 233                 }
 234                 return phrases;
 235         }
 236
 237         /**
 238          * Calculates the score for the given expression when using the given
 239          * phrases.
 240          *
 241          * @param phrases
 242          *            The phrases to search for
 243          * @param expression
 244          *            The expression to search
 245          * @return The score of the expression
 246          */
 247         private static double calculateScore(List<Phrase> phrases, String expression) {
 248                 logger.log(Level.FINEST, String.format("Calculating Score for “%s”…", expression));
 249                 double optionalHits = 0;
 250                 double requiredHits = 0;
 251                 int forbiddenHits = 0;
 252                 int requiredPhrases = 0;
 253                 for (Phrase phrase : phrases) {
 254                         String phraseString = phrase.getPhrase().toLowerCase();
 255                         if (phrase.getOptionality() == Phrase.Optionality.REQUIRED) {
 256                                 ++requiredPhrases;
 257                         }
 258                         int matches = 0;
 259                         int index = 0;
 260                         double score = 0;
 261                         while (index < expression.length()) {
 262                                 int position = expression.toLowerCase().indexOf(phraseString, index);
 263                                 if (position == -1) {
 264                                         break;
 265                                 }
 266                                 score += Math.pow(1 - position / (double) expression.length(), 2);
 267                                 index = position + phraseString.length();
 268                                 logger.log(Level.FINEST, String.format("Got hit at position %d.", position));
 269                                 ++matches;
 270                         }
 271                         logger.log(Level.FINEST, String.format("Score: %f", score));
 272                         if (matches == 0) {
 273                                 continue;
 274                         }
 275                         if (phrase.getOptionality() == Phrase.Optionality.REQUIRED) {
 276                                 requiredHits += score;
 277                         }
 278                         if (phrase.getOptionality() == Phrase.Optionality.OPTIONAL) {
 279                                 optionalHits += score;
 280                         }
 281                         if (phrase.getOptionality() == Phrase.Optionality.FORBIDDEN) {
 282                                 forbiddenHits += matches;
 283                         }
 284                 }
 285                 return requiredHits * 3 + optionalHits + (requiredHits - requiredPhrases) * 5 - (forbiddenHits * 2);
 286         }
 287
 288         /**
 289          * Throws a
 290          * {@link net.pterodactylus.sone.web.page.FreenetTemplatePage.RedirectException}
 291          * if the given object is not {@code null}, appending the object to the
 292          * given target URL.
 293          *
 294          * @param object
 295          *            The object on which to redirect
 296          * @param target
 297          *            The target of the redirect
 298          * @throws RedirectException
 299          *             if {@code object} is not {@code null}
 300          */
 301         private static void redirectIfNotNull(String object, String target) throws RedirectException {
 302                 if (object != null) {
 303                         throw new RedirectException(target + object);
 304                 }
 305         }
 306
 307         /**
 308          * If the given phrase contains a Sone ID (optionally prefixed by
 309          * “sone://”), returns said Sone ID, otherwise return {@code null}.
 310          *
 311          * @param phrase
 312          *            The phrase that maybe is a Sone ID
 313          * @return The Sone ID, or {@code null}
 314          */
 315         private String getSoneId(String phrase) {
 316                 String soneId = phrase.startsWith("sone://") ? phrase.substring(7) : phrase;
 317                 return (webInterface.getCore().getSone(soneId).isPresent()) ? soneId : null;
 318         }
 319
 320         /**
 321          * If the given phrase contains a post ID (optionally prefixed by
 322          * “post://”), returns said post ID, otherwise return {@code null}.
 323          *
 324          * @param phrase
 325          *            The phrase that maybe is a post ID
 326          * @return The post ID, or {@code null}
 327          */
 328         private String getPostId(String phrase) {
 329                 String postId = phrase.startsWith("post://") ? phrase.substring(7) : phrase;
 330                 return (webInterface.getCore().getPost(postId).isPresent()) ? postId : null;
 331         }
 332
 333         /**
 334          * If the given phrase contains a reply ID (optionally prefixed by
 335          * “reply://”), returns the ID of the post the reply belongs to, otherwise
 336          * return {@code null}.
 337          *
 338          * @param phrase
 339          *            The phrase that maybe is a reply ID
 340          * @return The reply’s post ID, or {@code null}
 341          */
 342         private String getReplyPostId(String phrase) {
 343                 String replyId = phrase.startsWith("reply://") ? phrase.substring(8) : phrase;
 344                 Optional<PostReply> postReply = webInterface.getCore().getPostReply(replyId);
 345                 if (!postReply.isPresent()) {
 346                         return null;
 347                 }
 348                 return postReply.get().getPostId();
 349         }
 350
 351         /**
 352          * If the given phrase contains an album ID (optionally prefixed by
 353          * “album://”), returns said album ID, otherwise return {@code null}.
 354          *
 355          * @param phrase
 356          *            The phrase that maybe is an album ID
 357          * @return The album ID, or {@code null}
 358          */
 359         private String getAlbumId(String phrase) {
 360                 String albumId = phrase.startsWith("album://") ? phrase.substring(8) : phrase;
 361                 return (webInterface.getCore().getAlbum(albumId) != null) ? albumId : null;
 362         }
 363
 364         /**
 365          * If the given phrase contains an image ID (optionally prefixed by
 366          * “image://”), returns said image ID, otherwise return {@code null}.
 367          *
 368          * @param phrase
 369          *            The phrase that maybe is an image ID
 370          * @return The image ID, or {@code null}
 371          */
 372         private String getImageId(String phrase) {
 373                 String imageId = phrase.startsWith("image://") ? phrase.substring(8) : phrase;
 374                 return (webInterface.getCore().getImage(imageId, false) != null) ? imageId : null;
 375         }
 376
 377         /**
 378          * Converts a given object into a {@link String}.
 379          *
 380          * @param <T>
 381          *            The type of the objects
 382          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 383          */
 384         private static interface StringGenerator<T> {
 385
 386                 /**
 387                  * Generates a {@link String} for the given object.
 388                  *
 389                  * @param object
 390                  *            The object to generate the {@link String} for
 391                  * @return The generated {@link String}
 392                  */
 393                 public String generateString(T object);
 394
 395         }
 396
 397         /**
 398          * Generates a {@link String} from a {@link Sone}, concatenating the name of
 399          * the Sone and all {@link Profile} {@link Field} values.
 400          *
 401          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 402          */
 403         private static class SoneStringGenerator implements StringGenerator<Sone> {
 404
 405                 /** A static instance of a complete Sone string generator. */
 406                 public static final SoneStringGenerator COMPLETE_GENERATOR = new SoneStringGenerator(true);
 407
 408                 /**
 409                  * A static instance of a Sone string generator that will only use the
 410                  * name of the Sone.
 411                  */
 412                 public static final SoneStringGenerator NAME_GENERATOR = new SoneStringGenerator(false);
 413
 414                 /** Whether to generate a string from all data of a Sone. */
 415                 private final boolean complete;
 416
 417                 /**
 418                  * Creates a new Sone string generator.
 419                  *
 420                  * @param complete
 421                  *            {@code true} to use the profile’s fields, {@code false} to
 422                  *            not to use the profile‘s fields
 423                  */
 424                 private SoneStringGenerator(boolean complete) {
 425                         this.complete = complete;
 426                 }
 427
 428                 /**
 429                  * {@inheritDoc}
 430                  */
 431                 @Override
 432                 public String generateString(Sone sone) {
 433                         StringBuilder soneString = new StringBuilder();
 434                         soneString.append(sone.getName());
 435                         Profile soneProfile = sone.getProfile();
 436                         if (soneProfile.getFirstName() != null) {
 437                                 soneString.append(' ').append(soneProfile.getFirstName());
 438                         }
 439                         if (soneProfile.getMiddleName() != null) {
 440                                 soneString.append(' ').append(soneProfile.getMiddleName());
 441                         }
 442                         if (soneProfile.getLastName() != null) {
 443                                 soneString.append(' ').append(soneProfile.getLastName());
 444                         }
 445                         if (complete) {
 446                                 for (Field field : soneProfile.getFields()) {
 447                                         soneString.append(' ').append(field.getValue());
 448                                 }
 449                         }
 450                         return soneString.toString();
 451                 }
 452
 453         }
 454
 455         /**
 456          * Generates a {@link String} from a {@link Post}, concatenating the text of
 457          * the post, the text of all {@link Reply}s, and the name of all
 458          * {@link Sone}s that have replied.
 459          *
 460          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 461          */
 462         private class PostStringGenerator implements StringGenerator<Post> {
 463
 464                 /**
 465                  * {@inheritDoc}
 466                  */
 467                 @Override
 468                 public String generateString(Post post) {
 469                         StringBuilder postString = new StringBuilder();
 470                         postString.append(post.getText());
 471                         if (post.getRecipient().isPresent()) {
 472                                 postString.append(' ').append(SoneStringGenerator.NAME_GENERATOR.generateString(post.getRecipient().get()));
 473                         }
 474                         for (PostReply reply : Collections2.filter(webInterface.getCore().getReplies(post.getId()), Reply.FUTURE_REPLY_FILTER)) {
 475                                 postString.append(' ').append(SoneStringGenerator.NAME_GENERATOR.generateString(reply.getSone()));
 476                                 postString.append(' ').append(reply.getText());
 477                         }
 478                         return postString.toString();
 479                 }
 480
 481         }
 482
 483         /**
 484          * A search phrase.
 485          *
 486          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 487          */
 488         private static class Phrase {
 489
 490                 /**
 491                  * The optionality of a search phrase.
 492                  *
 493                  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’
 494                  *         Roden</a>
 495                  */
 496                 public enum Optionality {
 497
 498                         /** The phrase is optional. */
 499                         OPTIONAL,
 500
 501                         /** The phrase is required. */
 502                         REQUIRED,
 503
 504                         /** The phrase is forbidden. */
 505                         FORBIDDEN
 506
 507                 }
 508
 509                 /** The phrase to search for. */
 510                 private final String phrase;
 511
 512                 /** The optionality of the phrase. */
 513                 private final Optionality optionality;
 514
 515                 /**
 516                  * Creates a new phrase.
 517                  *
 518                  * @param phrase
 519                  *            The phrase to search for
 520                  * @param optionality
 521                  *            The optionality of the phrase
 522                  */
 523                 public Phrase(String phrase, Optionality optionality) {
 524                         this.optionality = optionality;
 525                         this.phrase = phrase;
 526                 }
 527
 528                 /**
 529                  * Returns the phrase to search for.
 530                  *
 531                  * @return The phrase to search for
 532                  */
 533                 public String getPhrase() {
 534                         return phrase;
 535                 }
 536
 537                 /**
 538                  * Returns the optionality of the phrase.
 539                  *
 540                  * @return The optionality of the phrase
 541                  */
 542                 public Optionality getOptionality() {
 543                         return optionality;
 544                 }
 545
 546                 //
 547                 // OBJECT METHODS
 548                 //
 549
 550                 /**
 551                  * {@inheritDoc}
 552                  */
 553                 @Override
 554                 public int hashCode() {
 555                         return phrase.hashCode() ^ ((optionality == Optionality.FORBIDDEN) ? (0xaaaaaaaa) : ((optionality == Optionality.REQUIRED) ? 0x55555555 : 0));
 556                 }
 557
 558                 /**
 559                  * {@inheritDoc}
 560                  */
 561                 @Override
 562                 public boolean equals(Object object) {
 563                         if (!(object instanceof Phrase)) {
 564                                 return false;
 565                         }
 566                         Phrase phrase = (Phrase) object;
 567                         return (this.optionality == phrase.optionality) && this.phrase.equals(phrase.phrase);
 568                 }
 569
 570         }
 571
 572         /**
 573          * A hit consists of a searched object and the score it got for the phrases
 574          * of the search.
 575          *
 576          * @see SearchPage#calculateScore(List, String)
 577          * @param <T>
 578          *            The type of the searched object
 579          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 580          */
 581         private static class Hit<T> {
 582
 583                 /** Filter for {@link Hit}s with a score of more than 0. */
 584                 public static final Predicate<Hit<?>> POSITIVE_FILTER = new Predicate<Hit<?>>() {
 585
 586                         @Override
 587                         public boolean apply(Hit<?> hit) {
 588                                 return (hit != null) && (hit.getScore() > 0);
 589                         }
 590
 591                 };
 592
 593                 /** Comparator that sorts {@link Hit}s descending by score. */
 594                 public static final Comparator<Hit<?>> DESCENDING_COMPARATOR = new Comparator<Hit<?>>() {
 595
 596                         @Override
 597                         public int compare(Hit<?> leftHit, Hit<?> rightHit) {
 598                                 return Double.compare(rightHit.getScore(), leftHit.getScore());
 599                         }
 600
 601                 };
 602
 603                 /** The object that was searched. */
 604                 private final T object;
 605
 606                 /** The score of the object. */
 607                 private final double score;
 608
 609                 /**
 610                  * Creates a new hit.
 611                  *
 612                  * @param object
 613                  *            The object that was searched
 614                  * @param score
 615                  *            The score of the object
 616                  */
 617                 public Hit(T object, double score) {
 618                         this.object = object;
 619                         this.score = score;
 620                 }
 621
 622                 /**
 623                  * Returns the object that was searched.
 624                  *
 625                  * @return The object that was searched
 626                  */
 627                 public T getObject() {
 628                         return object;
 629                 }
 630
 631                 /**
 632                  * Returns the score of the object.
 633                  *
 634                  * @return The score of the object
 635                  */
 636                 public double getScore() {
 637                         return score;
 638                 }
 639
 640         }
 641
 642         /**
 643          * Extracts the object from a {@link Hit}.
 644          *
 645          * @param <T>
 646          *            The type of the object to extract
 647          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 648          */
 649         private static class HitMapper<T> implements Function<Hit<T>, T> {
 650
 651                 /**
 652                  * {@inheritDoc}
 653                  */
 654                 @Override
 655                 public T apply(Hit<T> input) {
 656                         return input.getObject();
 657                 }
 658
 659         }
 660
 661 }