2 * Rhynodge - 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.rhynodge.filters;
20 import static com.google.common.base.Optional.absent;
21 import static com.google.common.base.Preconditions.checkState;
22 import static java.util.Arrays.asList;
24 import java.util.HashMap;
26 import java.util.Collection;
27 import java.util.regex.Matcher;
28 import java.util.regex.Pattern;
30 import net.pterodactylus.rhynodge.Filter;
31 import net.pterodactylus.rhynodge.State;
32 import net.pterodactylus.rhynodge.states.EpisodeState;
33 import net.pterodactylus.rhynodge.states.EpisodeState.Episode;
34 import net.pterodactylus.rhynodge.states.FailedState;
35 import net.pterodactylus.rhynodge.states.TorrentState;
36 import net.pterodactylus.rhynodge.states.TorrentState.TorrentFile;
38 import com.google.common.base.Optional;
41 * {@link Filter} implementation that extracts {@link Episode} information from
42 * the {@link TorrentFile}s contained in a {@link TorrentState}.
44 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
46 public class EpisodeFilter implements Filter {
48 /** The pattern to parse episode information from the filename. */
49 private static final Collection<Pattern> episodePatterns = asList(Pattern.compile("[Ss](\\d{2})[Ee](\\d{2})"), Pattern.compile("[^\\d](\\d{1,2})x(\\d{2})[^\\d]"));
59 public State filter(State state) {
60 if (!state.success()) {
61 return FailedState.from(state);
63 checkState(state instanceof TorrentState, "state is not a TorrentState but a %s!", state.getClass());
65 TorrentState torrentState = (TorrentState) state;
66 Map<Episode, Episode> episodes = new HashMap<Episode, Episode>();
67 for (TorrentFile torrentFile : torrentState) {
68 Optional<Episode> episode = extractEpisode(torrentFile);
69 if (!episode.isPresent()) {
72 if (!episodes.containsKey(episode.get())) {
73 episodes.put(episode.get(), episode.get());
75 episodes.get(episode.get()).addTorrentFile(torrentFile);
78 return new EpisodeState(episodes.values());
86 * Extracts episode information from the given torrent file.
89 * The torrent file to extract the episode information from
90 * @return The extracted episode information, or {@link Optional#absent()} if
91 * no episode information could be found
93 private static Optional<Episode> extractEpisode(TorrentFile torrentFile) {
94 for (Pattern episodePattern : episodePatterns) {
95 Matcher matcher = episodePattern.matcher(torrentFile.name());
96 if (!matcher.find() || matcher.groupCount() < 2) {
99 String seasonString = matcher.group(1);
100 String episodeString = matcher.group(2);
101 int season = Integer.valueOf(seasonString);
102 int episode = Integer.valueOf(episodeString);
103 return Optional.of(new Episode(season, episode));