src/main/java/net/pterodactylus/rhynodge/filters/EpisodeFilter.java

   1 /*
   2  * Rhynodge - EpisodeFilter.java - Copyright © 2013 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.rhynodge.filters;
  19
  20 import static com.google.common.base.Preconditions.checkState;
  21 import static java.util.Arrays.asList;
  22
  23 import java.util.HashMap;
  24 import java.util.Map;
  25 import java.util.Collection;
  26 import java.util.regex.Matcher;
  27 import java.util.regex.Pattern;
  28
  29 import net.pterodactylus.rhynodge.Filter;
  30 import net.pterodactylus.rhynodge.State;
  31 import net.pterodactylus.rhynodge.states.EpisodeState;
  32 import net.pterodactylus.rhynodge.states.EpisodeState.Episode;
  33 import net.pterodactylus.rhynodge.states.FailedState;
  34 import net.pterodactylus.rhynodge.states.TorrentState;
  35 import net.pterodactylus.rhynodge.states.TorrentState.TorrentFile;
  36
  37 /**
  38  * {@link Filter} implementation that extracts {@link Episode} information from
  39  * the {@link TorrentFile}s contained in a {@link TorrentState}.
  40  *
  41  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  42  */
  43 public class EpisodeFilter implements Filter {
  44
  45         /** The pattern to parse episode information from the filename. */
  46         private static final Collection<Pattern> episodePatterns = asList(Pattern.compile("S(\\d{2})E(\\d{2})"), Pattern.compile("[^\\d](\\d{1,2})x(\\d{2})[^\\d]"));
  47
  48         //
  49         // FILTER METHODS
  50         //
  51
  52         /**
  53          * {@inheritDoc}
  54          */
  55         @Override
  56         public State filter(State state) {
  57                 if (!state.success()) {
  58                         return FailedState.from(state);
  59                 }
  60                 checkState(state instanceof TorrentState, "state is not a TorrentState but a %s!", state.getClass());
  61
  62                 TorrentState torrentState = (TorrentState) state;
  63                 Map<Episode, Episode> episodes = new HashMap<Episode, Episode>();
  64                 for (TorrentFile torrentFile : torrentState) {
  65                         Episode episode = extractEpisode(torrentFile);
  66                         if (episode == null) {
  67                                 continue;
  68                         }
  69                         if (!episodes.containsKey(episode)) {
  70                                 episodes.put(episode, episode);
  71                         }
  72                         episode = episodes.get(episode);
  73                         episode.addTorrentFile(torrentFile);
  74                 }
  75
  76                 return new EpisodeState(episodes.values());
  77         }
  78
  79         //
  80         // STATIC METHODS
  81         //
  82
  83         /**
  84          * Extracts episode information from the given torrent file.
  85          *
  86          * @param torrentFile
  87          *            The torrent file to extract the episode information from
  88          * @return The extracted episode information, or {@code null} if no episode
  89          *         information could be found
  90          */
  91         private static Episode extractEpisode(TorrentFile torrentFile) {
  92                 for (Pattern episodePattern : episodePatterns) {
  93                         Matcher matcher = episodePattern.matcher(torrentFile.name());
  94                         if (!matcher.find() || matcher.groupCount() < 2) {
  95                                 continue;
  96                         }
  97                         String seasonString = matcher.group(1);
  98                         String episodeString = matcher.group(2);
  99                         int season = Integer.valueOf(seasonString);
 100                         int episode = Integer.valueOf(episodeString);
 101                         return new Episode(season, episode);
 102                 }
 103                 return null;
 104         }
 105
 106 }