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

   1 /*
   2  * Reactor - 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.reactor.filters;
  19
  20 import static com.google.common.base.Preconditions.checkState;
  21
  22 import java.util.LinkedHashMap;
  23 import java.util.regex.Matcher;
  24 import java.util.regex.Pattern;
  25
  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;
  33
  34 /**
  35  * {@link Filter} implementation that extracts {@link Episode} information from
  36  * the {@link TorrentFile}s contained in a {@link TorrentState}.
  37  *
  38  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  39  */
  40 public class EpisodeFilter implements Filter {
  41
  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]");
  44
  45         //
  46         // FILTER METHODS
  47         //
  48
  49         /**
  50          * {@inheritDoc}
  51          */
  52         @Override
  53         public State filter(State state) {
  54                 if (!state.success()) {
  55                         return FailedState.from(state);
  56                 }
  57                 checkState(state instanceof TorrentState, "state is not a TorrentState but a %s!", state.getClass());
  58
  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) {
  64                                 continue;
  65                         }
  66                         episodes.put(episode, episode);
  67                         episode = episodes.get(episode);
  68                         episode.addTorrentFile(torrentFile);
  69                 }
  70
  71                 return new EpisodeState(episodes.values());
  72         }
  73
  74         //
  75         // STATIC METHODS
  76         //
  77
  78         /**
  79          * Extracts episode information from the given torrent file.
  80          *
  81          * @param torrentFile
  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
  85          */
  86         private static Episode extractEpisode(TorrentFile torrentFile) {
  87                 Matcher matcher = episodePattern.matcher(torrentFile.name());
  88                 if (!matcher.find()) {
  89                         return null;
  90                 }
  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);
  96                 }
  97                 int season = Integer.valueOf(seasonString);
  98                 int episode = Integer.valueOf(episodeString);
  99                 return new Episode(season, episode);
 100         }
 101
 102 }