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
  22 import java.util.HashMap;
  23 import java.util.Map;
  24 import java.util.regex.Matcher;
  25 import java.util.regex.Pattern;
  26
  27 import net.pterodactylus.rhynodge.Filter;
  28 import net.pterodactylus.rhynodge.State;
  29 import net.pterodactylus.rhynodge.states.EpisodeState;
  30 import net.pterodactylus.rhynodge.states.EpisodeState.Episode;
  31 import net.pterodactylus.rhynodge.states.FailedState;
  32 import net.pterodactylus.rhynodge.states.TorrentState;
  33 import net.pterodactylus.rhynodge.states.TorrentState.TorrentFile;
  34
  35 /**
  36  * {@link Filter} implementation that extracts {@link Episode} information from
  37  * the {@link TorrentFile}s contained in a {@link TorrentState}.
  38  *
  39  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  40  */
  41 public class EpisodeFilter implements Filter {
  42
  43         /** The pattern to parse episode information from the filename. */
  44         private static Pattern episodePattern = Pattern.compile("S(\\d{2})E(\\d{2})|[^\\d](\\d{1,2})x(\\d{2})[^\\d]");
  45
  46         //
  47         // FILTER METHODS
  48         //
  49
  50         /**
  51          * {@inheritDoc}
  52          */
  53         @Override
  54         public State filter(State state) {
  55                 if (!state.success()) {
  56                         return FailedState.from(state);
  57                 }
  58                 checkState(state instanceof TorrentState, "state is not a TorrentState but a %s!", state.getClass());
  59
  60                 TorrentState torrentState = (TorrentState) state;
  61                 Map<Episode, Episode> episodes = new HashMap<Episode, Episode>();
  62                 for (TorrentFile torrentFile : torrentState) {
  63                         Episode episode = extractEpisode(torrentFile);
  64                         if (episode == null) {
  65                                 continue;
  66                         }
  67                         if (!episodes.containsKey(episode)) {
  68                                 episodes.put(episode, episode);
  69                         }
  70                         episode = episodes.get(episode);
  71                         episode.addTorrentFile(torrentFile);
  72                 }
  73
  74                 return new EpisodeState(episodes.values());
  75         }
  76
  77         //
  78         // STATIC METHODS
  79         //
  80
  81         /**
  82          * Extracts episode information from the given torrent file.
  83          *
  84          * @param torrentFile
  85          *            The torrent file to extract the episode information from
  86          * @return The extracted episode information, or {@code null} if no episode
  87          *         information could be found
  88          */
  89         private static Episode extractEpisode(TorrentFile torrentFile) {
  90                 Matcher matcher = episodePattern.matcher(torrentFile.name());
  91                 if (!matcher.find()) {
  92                         return null;
  93                 }
  94                 String seasonString = matcher.group(1);
  95                 String episodeString = matcher.group(2);
  96                 if ((seasonString == null) && (episodeString == null)) {
  97                         seasonString = matcher.group(3);
  98                         episodeString = matcher.group(4);
  99                 }
 100                 int season = Integer.valueOf(seasonString);
 101                 int episode = Integer.valueOf(episodeString);
 102                 return new Episode(season, episode);
 103         }
 104
 105 }