2 * Reactor - EpisodeFilter.java - Copyright © 2013 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.reactor.filters;
20 import static com.google.common.base.Preconditions.checkState;
22 import java.util.LinkedHashMap;
23 import java.util.regex.Matcher;
24 import java.util.regex.Pattern;
26 import net.pterodactylus.reactor.Filter;
27 import net.pterodactylus.reactor.State;
28 import net.pterodactylus.reactor.states.EpisodeState;
29 import net.pterodactylus.reactor.states.EpisodeState.Episode;
30 import net.pterodactylus.reactor.states.FailedState;
31 import net.pterodactylus.reactor.states.TorrentState;
32 import net.pterodactylus.reactor.states.TorrentState.TorrentFile;
35 * {@link Filter} implementation that extracts {@link Episode} information from
36 * the {@link TorrentFile}s contained in a {@link TorrentState}.
38 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
40 public class EpisodeFilter implements Filter {
42 /** The pattern to parse episode information from the filename. */
43 private static Pattern episodePattern = Pattern.compile("S(\\d{2})E(\\d{2})|[^\\d](\\d{1,2})x(\\d{2})[^\\d]");
53 public State filter(State state) {
54 if (!state.success()) {
55 return FailedState.from(state);
57 checkState(state instanceof TorrentState, "state is not a TorrentState but a %s!", state.getClass());
59 TorrentState torrentState = (TorrentState) state;
60 LinkedHashMap<Episode, Episode> episodes = new LinkedHashMap<Episode, Episode>();
61 for (TorrentFile torrentFile : torrentState) {
62 Episode episode = extractEpisode(torrentFile);
63 if (episode == null) {
66 episodes.put(episode, episode);
67 episode = episodes.get(episode);
68 episode.addTorrentFile(torrentFile);
71 return new EpisodeState(episodes.values());
79 * Extracts episode information from the given torrent file.
82 * The torrent file to extract the episode information from
83 * @return The extracted episode information, or {@code null} if no episode
84 * information could be found
86 private static Episode extractEpisode(TorrentFile torrentFile) {
87 Matcher matcher = episodePattern.matcher(torrentFile.name());
88 if (!matcher.find()) {
91 String seasonString = matcher.group(1);
92 String episodeString = matcher.group(2);
93 if ((seasonString == null) && (episodeString == null)) {
94 seasonString = matcher.group(3);
95 episodeString = matcher.group(4);
97 int season = Integer.valueOf(seasonString);
98 int episode = Integer.valueOf(episodeString);
99 return new Episode(season, episode);