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

   1 /*
   2  * Sone - OptionsPage.java - Copyright © 2010 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 java.util.ArrayList;
  21 import java.util.Collection;
  22 import java.util.Collections;
  23 import java.util.Comparator;
  24 import java.util.HashSet;
  25 import java.util.List;
  26 import java.util.Set;
  27
  28 import net.pterodactylus.sone.data.Post;
  29 import net.pterodactylus.sone.data.Profile;
  30 import net.pterodactylus.sone.data.Profile.Field;
  31 import net.pterodactylus.sone.data.Reply;
  32 import net.pterodactylus.sone.data.Sone;
  33 import net.pterodactylus.util.collection.Converter;
  34 import net.pterodactylus.util.collection.Converters;
  35 import net.pterodactylus.util.collection.Pagination;
  36 import net.pterodactylus.util.filter.Filter;
  37 import net.pterodactylus.util.filter.Filters;
  38 import net.pterodactylus.util.number.Numbers;
  39 import net.pterodactylus.util.template.Template;
  40 import net.pterodactylus.util.template.TemplateContext;
  41 import net.pterodactylus.util.text.StringEscaper;
  42 import net.pterodactylus.util.text.TextException;
  43
  44 /**
  45  * This page lets the user search for posts and replies that contain certain
  46  * words.
  47  *
  48  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  49  */
  50 public class SearchPage extends SoneTemplatePage {
  51
  52         /**
  53          * Creates a new search page.
  54          *
  55          * @param template
  56          *            The template to render
  57          * @param webInterface
  58          *            The Sone web interface
  59          */
  60         public SearchPage(Template template, WebInterface webInterface) {
  61                 super("search.html", template, "Page.Search.Title", webInterface);
  62         }
  63
  64         //
  65         // SONETEMPLATEPAGE METHODS
  66         //
  67
  68         /**
  69          * {@inheritDoc}
  70          */
  71         @Override
  72         protected void processTemplate(Request request, TemplateContext templateContext) throws RedirectException {
  73                 super.processTemplate(request, templateContext);
  74                 String query = request.getHttpRequest().getParam("query").trim();
  75                 if (query.length() == 0) {
  76                         throw new RedirectException("index.html");
  77                 }
  78
  79                 List<Phrase> phrases = parseSearchPhrases(query);
  80
  81                 Set<Sone> sones = webInterface.getCore().getSones();
  82                 Set<Hit<Sone>> soneHits = getHits(sones, phrases, SoneStringGenerator.GENERATOR);
  83
  84                 Set<Post> posts = new HashSet<Post>();
  85                 for (Sone sone : sones) {
  86                         posts.addAll(sone.getPosts());
  87                 }
  88                 @SuppressWarnings("synthetic-access")
  89                 Set<Hit<Post>> postHits = getHits(posts, phrases, new PostStringGenerator());
  90
  91                 /* now filter. */
  92                 soneHits = Filters.filteredSet(soneHits, Hit.POSITIVE_FILTER);
  93                 postHits = Filters.filteredSet(postHits, Hit.POSITIVE_FILTER);
  94
  95                 /* now sort. */
  96                 List<Hit<Sone>> sortedSoneHits = new ArrayList<Hit<Sone>>(soneHits);
  97                 Collections.sort(sortedSoneHits, Hit.DESCENDING_COMPARATOR);
  98                 List<Hit<Post>> sortedPostHits = new ArrayList<Hit<Post>>(postHits);
  99                 Collections.sort(sortedPostHits, Hit.DESCENDING_COMPARATOR);
 100
 101                 /* extract Sones and posts. */
 102                 List<Sone> resultSones = Converters.convertList(sortedSoneHits, new HitConverter<Sone>());
 103                 List<Post> resultPosts = Converters.convertList(sortedPostHits, new HitConverter<Post>());
 104
 105                 /* pagination. */
 106                 Pagination<Sone> sonePagination = new Pagination<Sone>(resultSones, 10).setPage(Numbers.safeParseInteger(request.getHttpRequest().getParam("sonePage"), 0));
 107                 Pagination<Post> postPagination = new Pagination<Post>(resultPosts, 10).setPage(Numbers.safeParseInteger(request.getHttpRequest().getParam("postPage"), 0));
 108
 109                 templateContext.set("sonePagination", sonePagination);
 110                 templateContext.set("soneHits", sonePagination.getItems());
 111                 templateContext.set("postPagination", postPagination);
 112                 templateContext.set("postHits", postPagination.getItems());
 113         }
 114
 115         //
 116         // PRIVATE METHODS
 117         //
 118
 119         /**
 120          * Collects hit information for the given objects. The objects are converted
 121          * to a {@link String} using the given {@link StringGenerator}, and the
 122          * {@link #calculateScore(List, String) calculated score} is stored together
 123          * with the object in a {@link Hit}, and all resulting {@link Hit}s are then
 124          * returned.
 125          *
 126          * @param <T>
 127          *            The type of the objects
 128          * @param objects
 129          *            The objects to search over
 130          * @param phrases
 131          *            The phrases to search for
 132          * @param stringGenerator
 133          *            The string generator for the objects
 134          * @return The hits for the given phrases
 135          */
 136         private <T> Set<Hit<T>> getHits(Collection<T> objects, List<Phrase> phrases, StringGenerator<T> stringGenerator) {
 137                 Set<Hit<T>> hits = new HashSet<Hit<T>>();
 138                 for (T object : objects) {
 139                         String objectString = stringGenerator.generateString(object);
 140                         int score = calculateScore(phrases, objectString);
 141                         hits.add(new Hit<T>(object, score));
 142                 }
 143                 return hits;
 144         }
 145
 146         /**
 147          * Parses the given query into search phrases. The query is split on
 148          * whitespace while allowing to group words using single or double quotes.
 149          * Isolated phrases starting with a “+” are
 150          * {@link Phrase.Optionality#REQUIRED}, phrases with a “-” are
 151          * {@link Phrase.Optionality#FORBIDDEN}.
 152          *
 153          * @param query
 154          *            The query to parse
 155          * @return The parsed phrases
 156          */
 157         private List<Phrase> parseSearchPhrases(String query) {
 158                 List<String> parsedPhrases = null;
 159                 try {
 160                         parsedPhrases = StringEscaper.parseLine(query);
 161                 } catch (TextException te1) {
 162                         /* invalid query. */
 163                         return Collections.emptyList();
 164                 }
 165
 166                 List<Phrase> phrases = new ArrayList<Phrase>();
 167                 for (String phrase : parsedPhrases) {
 168                         if (phrase.startsWith("+")) {
 169                                 phrases.add(new Phrase(phrase.substring(1), Phrase.Optionality.REQUIRED));
 170                         } else if (phrase.startsWith("-")) {
 171                                 phrases.add(new Phrase(phrase.substring(1), Phrase.Optionality.FORBIDDEN));
 172                         }
 173                         phrases.add(new Phrase(phrase, Phrase.Optionality.OPTIONAL));
 174                 }
 175                 return phrases;
 176         }
 177
 178         /**
 179          * Calculates the score for the given expression when using the given
 180          * phrases.
 181          *
 182          * @param phrases
 183          *            The phrases to search for
 184          * @param expression
 185          *            The expression to search
 186          * @return The score of the expression
 187          */
 188         private int calculateScore(List<Phrase> phrases, String expression) {
 189                 int optionalHits = 0;
 190                 int requiredHits = 0;
 191                 int forbiddenHits = 0;
 192                 int requiredPhrases = 0;
 193                 for (Phrase phrase : phrases) {
 194                         if (phrase.getOptionality() == Phrase.Optionality.REQUIRED) {
 195                                 ++requiredPhrases;
 196                         }
 197                         boolean matches = expression.toLowerCase().contains(phrase.getPhrase().toLowerCase());
 198                         if (!matches) {
 199                                 continue;
 200                         }
 201                         if (phrase.getOptionality() == Phrase.Optionality.REQUIRED) {
 202                                 ++requiredHits;
 203                         }
 204                         if (phrase.getOptionality() == Phrase.Optionality.OPTIONAL) {
 205                                 ++optionalHits;
 206                         }
 207                         if (phrase.getOptionality() == Phrase.Optionality.FORBIDDEN) {
 208                                 ++forbiddenHits;
 209                         }
 210                 }
 211                 return requiredHits * 3 + optionalHits + (requiredHits - requiredPhrases) * 5 - (forbiddenHits * 2);
 212         }
 213
 214         /**
 215          * Converts a given object into a {@link String}.
 216          *
 217          * @param <T>
 218          *            The type of the objects
 219          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 220          */
 221         private static interface StringGenerator<T> {
 222
 223                 /**
 224                  * Generates a {@link String} for the given object.
 225                  *
 226                  * @param object
 227                  *            The object to generate the {@link String} for
 228                  * @return The generated {@link String}
 229                  */
 230                 public String generateString(T object);
 231
 232         }
 233
 234         /**
 235          * Generates a {@link String} from a {@link Sone}, concatenating the name of
 236          * the Sone and all {@link Profile} {@link Field} values.
 237          *
 238          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 239          */
 240         private static class SoneStringGenerator implements StringGenerator<Sone> {
 241
 242                 /** A static instance of the Sone string generator. */
 243                 public static final SoneStringGenerator GENERATOR = new SoneStringGenerator();
 244
 245                 /**
 246                  * {@inheritDoc}
 247                  */
 248                 @Override
 249                 public String generateString(Sone sone) {
 250                         StringBuilder soneString = new StringBuilder();
 251                         soneString.append(sone.getName());
 252                         Profile soneProfile = sone.getProfile();
 253                         if (soneProfile.getFirstName() != null) {
 254                                 soneString.append(' ').append(soneProfile.getFirstName());
 255                         }
 256                         if (soneProfile.getMiddleName() != null) {
 257                                 soneString.append(' ').append(soneProfile.getMiddleName());
 258                         }
 259                         if (soneProfile.getLastName() != null) {
 260                                 soneString.append(' ').append(soneProfile.getLastName());
 261                         }
 262                         for (Field field : soneProfile.getFields()) {
 263                                 soneString.append(' ').append(field.getValue());
 264                         }
 265                         return soneString.toString();
 266                 }
 267
 268         }
 269
 270         /**
 271          * Generates a {@link String} from a {@link Post}, concatenating the text of
 272          * the post, the text of all {@link Reply}s, and the name of all
 273          * {@link Sone}s that have replied.
 274          *
 275          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 276          */
 277         private class PostStringGenerator implements StringGenerator<Post> {
 278
 279                 /**
 280                  * {@inheritDoc}
 281                  */
 282                 @Override
 283                 public String generateString(Post post) {
 284                         StringBuilder postString = new StringBuilder();
 285                         postString.append(post.getText());
 286                         if (post.getRecipient() != null) {
 287                                 postString.append(' ').append(SoneStringGenerator.GENERATOR.generateString(post.getRecipient()));
 288                         }
 289                         for (Reply reply : webInterface.getCore().getReplies(post)) {
 290                                 postString.append(' ').append(SoneStringGenerator.GENERATOR.generateString(reply.getSone()));
 291                                 postString.append(' ').append(reply.getText());
 292                         }
 293                         return postString.toString();
 294                 }
 295
 296         }
 297
 298         /**
 299          * A search phrase.
 300          *
 301          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 302          */
 303         private static class Phrase {
 304
 305                 /**
 306                  * The optionality of a search phrase.
 307                  *
 308                  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’
 309                  *         Roden</a>
 310                  */
 311                 public enum Optionality {
 312
 313                         /** The phrase is optional. */
 314                         OPTIONAL,
 315
 316                         /** The phrase is required. */
 317                         REQUIRED,
 318
 319                         /** The phrase is forbidden. */
 320                         FORBIDDEN
 321
 322                 }
 323
 324                 /** The phrase to search for. */
 325                 private final String phrase;
 326
 327                 /** The optionality of the phrase. */
 328                 private final Optionality optionality;
 329
 330                 /**
 331                  * Creates a new phrase.
 332                  *
 333                  * @param phrase
 334                  *            The phrase to search for
 335                  * @param optionality
 336                  *            The optionality of the phrase
 337                  */
 338                 public Phrase(String phrase, Optionality optionality) {
 339                         this.optionality = optionality;
 340                         this.phrase = phrase;
 341                 }
 342
 343                 /**
 344                  * Returns the phrase to search for.
 345                  *
 346                  * @return The phrase to search for
 347                  */
 348                 public String getPhrase() {
 349                         return phrase;
 350                 }
 351
 352                 /**
 353                  * Returns the optionality of the phrase.
 354                  *
 355                  * @return The optionality of the phrase
 356                  */
 357                 public Optionality getOptionality() {
 358                         return optionality;
 359                 }
 360
 361         }
 362
 363         /**
 364          * A hit consists of a searched object and the score it got for the phrases
 365          * of the search.
 366          *
 367          * @see SearchPage#calculateScore(List, String)
 368          * @param <T>
 369          *            The type of the searched object
 370          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 371          */
 372         private static class Hit<T> {
 373
 374                 /** Filter for {@link Hit}s with a score of more than 0. */
 375                 public static final Filter<Hit<?>> POSITIVE_FILTER = new Filter<Hit<?>>() {
 376
 377                         @Override
 378                         public boolean filterObject(Hit<?> hit) {
 379                                 return hit.getScore() > 0;
 380                         }
 381
 382                 };
 383
 384                 /** Comparator that sorts {@link Hit}s descending by score. */
 385                 public static final Comparator<Hit<?>> DESCENDING_COMPARATOR = new Comparator<Hit<?>>() {
 386
 387                         @Override
 388                         public int compare(Hit<?> leftHit, Hit<?> rightHit) {
 389                                 return rightHit.getScore() - leftHit.getScore();
 390                         }
 391
 392                 };
 393
 394                 /** The object that was searched. */
 395                 private final T object;
 396
 397                 /** The score of the object. */
 398                 private final int score;
 399
 400                 /**
 401                  * Creates a new hit.
 402                  *
 403                  * @param object
 404                  *            The object that was searched
 405                  * @param score
 406                  *            The score of the object
 407                  */
 408                 public Hit(T object, int score) {
 409                         this.object = object;
 410                         this.score = score;
 411                 }
 412
 413                 /**
 414                  * Returns the object that was searched.
 415                  *
 416                  * @return The object that was searched
 417                  */
 418                 public T getObject() {
 419                         return object;
 420                 }
 421
 422                 /**
 423                  * Returns the score of the object.
 424                  *
 425                  * @return The score of the object
 426                  */
 427                 public int getScore() {
 428                         return score;
 429                 }
 430
 431         }
 432
 433         /**
 434          * Extracts the object from a {@link Hit}.
 435          *
 436          * @param <T>
 437          *            The type of the object to extract
 438          * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
 439          */
 440         public static class HitConverter<T> implements Converter<Hit<T>, T> {
 441
 442                 /**
 443                  * {@inheritDoc}
 444                  */
 445                 @Override
 446                 public T convert(Hit<T> input) {
 447                         return input.getObject();
 448                 }
 449
 450         }
 451
 452 }