src/main/java/net/pterodactylus/rhynodge/mergers/EpisodeMerger.java

   1 /*
   2  * Rhynodge - EpisodeMerger.java - Copyright © 2013–2021 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.mergers;
  19
  20 import java.util.ArrayList;
  21 import java.util.Collection;
  22 import java.util.HashSet;
  23 import java.util.Map;
  24
  25 import javax.annotation.Nonnull;
  26
  27 import net.pterodactylus.rhynodge.Merger;
  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.TorrentState.TorrentFile;
  32
  33 import static com.google.common.base.Preconditions.checkState;
  34 import static java.util.function.Function.identity;
  35 import static java.util.stream.Collectors.toMap;
  36
  37 /**
  38  * {@link Merger} implementation that merges two {@link EpisodeState}s.
  39  *
  40  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  41  */
  42 public class EpisodeMerger implements Merger {
  43
  44         /**
  45          * {@inheritDoc}
  46          */
  47         @Nonnull
  48         @Override
  49         public State mergeStates(@Nonnull State previousState, @Nonnull State currentState) {
  50                 checkState(currentState instanceof EpisodeState, "currentState is not a EpisodeState but a %s", currentState.getClass().getName());
  51                 checkState(previousState instanceof EpisodeState, "previousState is not a EpisodeState but a %s", currentState.getClass().getName());
  52
  53                 Collection<Episode> newEpisodes = new HashSet<>();
  54                 Collection<Episode> changedEpisodes = new HashSet<>();
  55                 Collection<TorrentFile> newTorrentFiles = new HashSet<>();
  56                 Map<Episode, Episode> allEpisodes = ((EpisodeState) previousState).episodes().stream().collect(toMap(identity(), identity()));
  57                 for (Episode episode : ((EpisodeState) currentState).episodes()) {
  58                         if (!allEpisodes.containsKey(episode)) {
  59                                 allEpisodes.put(episode, episode);
  60                                 newEpisodes.add(episode);
  61                         }
  62                         Episode existingEpisode = allEpisodes.get(episode);
  63                         for (TorrentFile torrentFile : new ArrayList<>(episode.torrentFiles())) {
  64                                 int oldSize = existingEpisode.torrentFiles().size();
  65                                 existingEpisode.addTorrentFile(torrentFile);
  66                                 int newSize = existingEpisode.torrentFiles().size();
  67                                 if (oldSize != newSize) {
  68                                         newTorrentFiles.add(torrentFile);
  69                                 }
  70                                 if (!newEpisodes.contains(existingEpisode) && (oldSize != newSize)) {
  71                                         changedEpisodes.add(existingEpisode);
  72                                 }
  73                         }
  74                 }
  75                 return new EpisodeState(allEpisodes.values(), newEpisodes, changedEpisodes, newTorrentFiles);
  76         }
  77
  78 }