2 * Sone - SearchPage.java - Copyright © 2010 David Roden
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.
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.
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/>.
18 package net.pterodactylus.sone.web;
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;
27 import java.util.logging.Level;
28 import java.util.logging.Logger;
30 import net.pterodactylus.sone.data.Post;
31 import net.pterodactylus.sone.data.Profile;
32 import net.pterodactylus.sone.data.Profile.Field;
33 import net.pterodactylus.sone.data.Reply;
34 import net.pterodactylus.sone.data.Sone;
35 import net.pterodactylus.util.collection.Mapper;
36 import net.pterodactylus.util.collection.Mappers;
37 import net.pterodactylus.util.collection.Pagination;
38 import net.pterodactylus.util.filter.Filter;
39 import net.pterodactylus.util.filter.Filters;
40 import net.pterodactylus.util.logging.Logging;
41 import net.pterodactylus.util.number.Numbers;
42 import net.pterodactylus.util.template.Template;
43 import net.pterodactylus.util.template.TemplateContext;
44 import net.pterodactylus.util.text.StringEscaper;
45 import net.pterodactylus.util.text.TextException;
48 * This page lets the user search for posts and replies that contain certain
51 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
53 public class SearchPage extends SoneTemplatePage {
56 private static final Logger logger = Logging.getLogger(SearchPage.class);
59 * Creates a new search page.
62 * The template to render
64 * The Sone web interface
66 public SearchPage(Template template, WebInterface webInterface) {
67 super("search.html", template, "Page.Search.Title", webInterface);
71 // SONETEMPLATEPAGE METHODS
78 protected void processTemplate(Request request, TemplateContext templateContext) throws RedirectException {
79 super.processTemplate(request, templateContext);
80 String query = request.getHttpRequest().getParam("query").trim();
81 if (query.length() == 0) {
82 throw new RedirectException("index.html");
85 List<Phrase> phrases = parseSearchPhrases(query);
86 if (phrases.isEmpty()) {
87 throw new RedirectException("index.html");
90 Set<Sone> sones = webInterface.getCore().getSones();
91 Set<Hit<Sone>> soneHits = getHits(sones, phrases, SoneStringGenerator.COMPLETE_GENERATOR);
93 Set<Post> posts = new HashSet<Post>();
94 for (Sone sone : sones) {
95 posts.addAll(sone.getPosts());
97 @SuppressWarnings("synthetic-access")
98 Set<Hit<Post>> postHits = getHits(Filters.filteredSet(posts, Post.FUTURE_POSTS_FILTER), phrases, new PostStringGenerator());
101 soneHits = Filters.filteredSet(soneHits, Hit.POSITIVE_FILTER);
102 postHits = Filters.filteredSet(postHits, Hit.POSITIVE_FILTER);
105 List<Hit<Sone>> sortedSoneHits = new ArrayList<Hit<Sone>>(soneHits);
106 Collections.sort(sortedSoneHits, Hit.DESCENDING_COMPARATOR);
107 List<Hit<Post>> sortedPostHits = new ArrayList<Hit<Post>>(postHits);
108 Collections.sort(sortedPostHits, Hit.DESCENDING_COMPARATOR);
110 /* extract Sones and posts. */
111 List<Sone> resultSones = Mappers.mappedList(sortedSoneHits, new HitMapper<Sone>());
112 List<Post> resultPosts = Mappers.mappedList(sortedPostHits, new HitMapper<Post>());
115 Pagination<Sone> sonePagination = new Pagination<Sone>(resultSones, webInterface.getCore().getPreferences().getPostsPerPage()).setPage(Numbers.safeParseInteger(request.getHttpRequest().getParam("sonePage"), 0));
116 Pagination<Post> postPagination = new Pagination<Post>(resultPosts, webInterface.getCore().getPreferences().getPostsPerPage()).setPage(Numbers.safeParseInteger(request.getHttpRequest().getParam("postPage"), 0));
118 templateContext.set("sonePagination", sonePagination);
119 templateContext.set("soneHits", sonePagination.getItems());
120 templateContext.set("postPagination", postPagination);
121 templateContext.set("postHits", postPagination.getItems());
129 * Collects hit information for the given objects. The objects are converted
130 * to a {@link String} using the given {@link StringGenerator}, and the
131 * {@link #calculateScore(List, String) calculated score} is stored together
132 * with the object in a {@link Hit}, and all resulting {@link Hit}s are then
136 * The type of the objects
138 * The objects to search over
140 * The phrases to search for
141 * @param stringGenerator
142 * The string generator for the objects
143 * @return The hits for the given phrases
145 private <T> Set<Hit<T>> getHits(Collection<T> objects, List<Phrase> phrases, StringGenerator<T> stringGenerator) {
146 Set<Hit<T>> hits = new HashSet<Hit<T>>();
147 for (T object : objects) {
148 String objectString = stringGenerator.generateString(object);
149 double score = calculateScore(phrases, objectString);
150 hits.add(new Hit<T>(object, score));
156 * Parses the given query into search phrases. The query is split on
157 * whitespace while allowing to group words using single or double quotes.
158 * Isolated phrases starting with a “+” are
159 * {@link Phrase.Optionality#REQUIRED}, phrases with a “-” are
160 * {@link Phrase.Optionality#FORBIDDEN}.
164 * @return The parsed phrases
166 private List<Phrase> parseSearchPhrases(String query) {
167 List<String> parsedPhrases = null;
169 parsedPhrases = StringEscaper.parseLine(query);
170 } catch (TextException te1) {
172 return Collections.emptyList();
175 List<Phrase> phrases = new ArrayList<Phrase>();
176 for (String phrase : parsedPhrases) {
177 if (phrase.startsWith("+")) {
178 if (phrase.length() > 1) {
179 phrases.add(new Phrase(phrase.substring(1), Phrase.Optionality.REQUIRED));
181 phrases.add(new Phrase("+", Phrase.Optionality.OPTIONAL));
183 } else if (phrase.startsWith("-")) {
184 if (phrase.length() > 1) {
185 phrases.add(new Phrase(phrase.substring(1), Phrase.Optionality.FORBIDDEN));
187 phrases.add(new Phrase("-", Phrase.Optionality.OPTIONAL));
190 phrases.add(new Phrase(phrase, Phrase.Optionality.OPTIONAL));
197 * Calculates the score for the given expression when using the given
201 * The phrases to search for
203 * The expression to search
204 * @return The score of the expression
206 private double calculateScore(List<Phrase> phrases, String expression) {
207 logger.log(Level.FINEST, "Calculating Score for “%s”…", expression);
208 double optionalHits = 0;
209 double requiredHits = 0;
210 int forbiddenHits = 0;
211 int requiredPhrases = 0;
212 for (Phrase phrase : phrases) {
213 String phraseString = phrase.getPhrase().toLowerCase();
214 if (phrase.getOptionality() == Phrase.Optionality.REQUIRED) {
220 while (index < expression.length()) {
221 int position = expression.toLowerCase().indexOf(phraseString, index);
222 if (position == -1) {
225 score += Math.pow(1 - position / (double) expression.length(), 2);
226 index = position + phraseString.length();
227 logger.log(Level.FINEST, "Got hit at position %d.", position);
230 logger.log(Level.FINEST, "Score: %f", score);
234 if (phrase.getOptionality() == Phrase.Optionality.REQUIRED) {
235 requiredHits += score;
237 if (phrase.getOptionality() == Phrase.Optionality.OPTIONAL) {
238 optionalHits += score;
240 if (phrase.getOptionality() == Phrase.Optionality.FORBIDDEN) {
241 forbiddenHits += matches;
244 return requiredHits * 3 + optionalHits + (requiredHits - requiredPhrases) * 5 - (forbiddenHits * 2);
248 * Converts a given object into a {@link String}.
251 * The type of the objects
252 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
254 private static interface StringGenerator<T> {
257 * Generates a {@link String} for the given object.
260 * The object to generate the {@link String} for
261 * @return The generated {@link String}
263 public String generateString(T object);
268 * Generates a {@link String} from a {@link Sone}, concatenating the name of
269 * the Sone and all {@link Profile} {@link Field} values.
271 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
273 private static class SoneStringGenerator implements StringGenerator<Sone> {
275 /** A static instance of a complete Sone string generator. */
276 public static final SoneStringGenerator COMPLETE_GENERATOR = new SoneStringGenerator(true);
279 * A static instance of a Sone string generator that will only use the
282 public static final SoneStringGenerator NAME_GENERATOR = new SoneStringGenerator(false);
284 /** Whether to generate a string from all data of a Sone. */
285 private final boolean complete;
288 * Creates a new Sone string generator.
291 * {@code true} to use the profile’s fields, {@code false} to
292 * not to use the profile‘s fields
294 private SoneStringGenerator(boolean complete) {
295 this.complete = complete;
302 public String generateString(Sone sone) {
303 StringBuilder soneString = new StringBuilder();
304 soneString.append(sone.getName());
305 Profile soneProfile = sone.getProfile();
306 if (soneProfile.getFirstName() != null) {
307 soneString.append(' ').append(soneProfile.getFirstName());
309 if (soneProfile.getMiddleName() != null) {
310 soneString.append(' ').append(soneProfile.getMiddleName());
312 if (soneProfile.getLastName() != null) {
313 soneString.append(' ').append(soneProfile.getLastName());
316 for (Field field : soneProfile.getFields()) {
317 soneString.append(' ').append(field.getValue());
320 return soneString.toString();
326 * Generates a {@link String} from a {@link Post}, concatenating the text of
327 * the post, the text of all {@link Reply}s, and the name of all
328 * {@link Sone}s that have replied.
330 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
332 private class PostStringGenerator implements StringGenerator<Post> {
338 public String generateString(Post post) {
339 StringBuilder postString = new StringBuilder();
340 postString.append(post.getText());
341 if (post.getRecipient() != null) {
342 postString.append(' ').append(SoneStringGenerator.NAME_GENERATOR.generateString(post.getRecipient()));
344 for (Reply reply : Filters.filteredList(webInterface.getCore().getReplies(post), Reply.FUTURE_REPLIES_FILTER)) {
345 postString.append(' ').append(SoneStringGenerator.NAME_GENERATOR.generateString(reply.getSone()));
346 postString.append(' ').append(reply.getText());
348 return postString.toString();
356 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
358 private static class Phrase {
361 * The optionality of a search phrase.
363 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’
366 public enum Optionality {
368 /** The phrase is optional. */
371 /** The phrase is required. */
374 /** The phrase is forbidden. */
379 /** The phrase to search for. */
380 private final String phrase;
382 /** The optionality of the phrase. */
383 private final Optionality optionality;
386 * Creates a new phrase.
389 * The phrase to search for
391 * The optionality of the phrase
393 public Phrase(String phrase, Optionality optionality) {
394 this.optionality = optionality;
395 this.phrase = phrase;
399 * Returns the phrase to search for.
401 * @return The phrase to search for
403 public String getPhrase() {
408 * Returns the optionality of the phrase.
410 * @return The optionality of the phrase
412 public Optionality getOptionality() {
424 public int hashCode() {
425 return phrase.hashCode() ^ ((optionality == Optionality.FORBIDDEN) ? (0xaaaaaaaa) : ((optionality == Optionality.REQUIRED) ? 0x55555555 : 0));
432 public boolean equals(Object object) {
433 if (!(object instanceof Phrase)) {
436 Phrase phrase = (Phrase) object;
437 return (this.optionality == phrase.optionality) && this.phrase.equals(phrase.phrase);
443 * A hit consists of a searched object and the score it got for the phrases
446 * @see SearchPage#calculateScore(List, String)
448 * The type of the searched object
449 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
451 private static class Hit<T> {
453 /** Filter for {@link Hit}s with a score of more than 0. */
454 public static final Filter<Hit<?>> POSITIVE_FILTER = new Filter<Hit<?>>() {
457 public boolean filterObject(Hit<?> hit) {
458 return hit.getScore() > 0;
463 /** Comparator that sorts {@link Hit}s descending by score. */
464 public static final Comparator<Hit<?>> DESCENDING_COMPARATOR = new Comparator<Hit<?>>() {
467 public int compare(Hit<?> leftHit, Hit<?> rightHit) {
468 return (rightHit.getScore() < leftHit.getScore()) ? -1 : ((rightHit.getScore() > leftHit.getScore()) ? 1 : 0);
473 /** The object that was searched. */
474 private final T object;
476 /** The score of the object. */
477 private final double score;
483 * The object that was searched
485 * The score of the object
487 public Hit(T object, double score) {
488 this.object = object;
493 * Returns the object that was searched.
495 * @return The object that was searched
497 public T getObject() {
502 * Returns the score of the object.
504 * @return The score of the object
506 public double getScore() {
513 * Extracts the object from a {@link Hit}.
516 * The type of the object to extract
517 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
519 public static class HitMapper<T> implements Mapper<Hit<T>, T> {
525 public T map(Hit<T> input) {
526 return input.getObject();