src/main/java/net/pterodactylus/demoscenemusic/data/DataManager.java

   1 /*
   2  * DemosceneMusic - DataManager.java - Copyright © 2012 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.demoscenemusic.data;
  19
  20 import java.sql.ResultSet;
  21 import java.sql.SQLException;
  22 import java.util.ArrayList;
  23 import java.util.Collection;
  24 import java.util.HashSet;
  25 import java.util.List;
  26 import java.util.concurrent.Callable;
  27
  28 import net.pterodactylus.util.collection.Memoizer;
  29 import net.pterodactylus.util.database.Database;
  30 import net.pterodactylus.util.database.DatabaseException;
  31 import net.pterodactylus.util.database.Field;
  32 import net.pterodactylus.util.database.Join;
  33 import net.pterodactylus.util.database.Join.JoinType;
  34 import net.pterodactylus.util.database.OrderField;
  35 import net.pterodactylus.util.database.OrderField.Order;
  36 import net.pterodactylus.util.database.Parameter.StringParameter;
  37 import net.pterodactylus.util.database.Query;
  38 import net.pterodactylus.util.database.Query.Type;
  39 import net.pterodactylus.util.database.ResultProcessor;
  40 import net.pterodactylus.util.database.ValueField;
  41 import net.pterodactylus.util.database.ValueFieldWhereClause;
  42
  43 /**
  44  * TODO
  45  *
  46  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  47  */
  48 public class DataManager {
  49
  50         private final Database database;
  51
  52         public DataManager(Database database) {
  53                 this.database = database;
  54         }
  55
  56         public Collection<Artist> getAllArtists() throws DatabaseException {
  57                 Query query = new Query(Type.SELECT, "ARTISTS");
  58                 query.addField(new Field("ARTISTS.*"));
  59                 query.addField(new Field("GROUP_ARTISTS.*"));
  60                 query.addField(new Field("GROUPS.*"));
  61                 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("ARTISTS.ID"), new Field("GROUP_ARTISTS.ARTIST")));
  62                 query.addJoin(new Join(JoinType.INNER, "GROUPS", new Field("GROUP_ARTISTS.GROUP_"), new Field("GROUPS.ID")));
  63                 query.addOrderField(new OrderField(new Field("ARTISTS.ID")));
  64                 ArtistLoader artistLoader = new ArtistLoader();
  65                 database.process(query, artistLoader);
  66                 return artistLoader.all();
  67         }
  68
  69         public Artist getArtistById(String id) throws DatabaseException {
  70                 Query query = new Query(Type.SELECT, "ARTISTS");
  71                 query.addField(new Field("ARTISTS.*"));
  72                 query.addField(new Field("GROUP_ARTISTS.*"));
  73                 query.addField(new Field("GROUPS.*"));
  74                 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("ARTISTS.ID"), new Field("GROUP_ARTISTS.ARTIST")));
  75                 query.addJoin(new Join(JoinType.INNER, "GROUPS", new Field("GROUP_ARTISTS.GROUP_"), new Field("GROUPS.ID")));
  76                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(id))));
  77                 query.addOrderField(new OrderField(new Field("ARTISTS.ID")));
  78                 ArtistLoader artistLoader = new ArtistLoader();
  79                 database.process(query, artistLoader);
  80                 return artistLoader.get();
  81         }
  82
  83         public Track trackById(String id) throws DatabaseException {
  84                 Query query = new Query(Type.SELECT, "TRACKS");
  85                 query.addField(new Field("TRACKS.*"));
  86                 query.addField(new Field("TRACK_ARTISTS.*"));
  87                 query.addField(new Field("ARTISTS.*"));
  88                 query.addField(new Field("TRACK_STYLES.*"));
  89                 query.addField(new Field("STYLES.*"));
  90                 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
  91                 query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
  92                 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
  93                 query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
  94                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACKS.ID", new StringParameter(id))));
  95                 query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
  96                 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
  97                 TrackLoader trackLoader = new TrackLoader();
  98                 database.process(query, trackLoader);
  99                 return trackLoader.get();
 100         }
 101
 102         public Collection<Track> getTracksByArtist(String artistId) throws DatabaseException {
 103                 Query query = new Query(Type.SELECT, "TRACKS");
 104                 query.addField(new Field("TRACKS.*"));
 105                 query.addField(new Field("TRACK_ARTISTS.*"));
 106                 query.addField(new Field("ARTISTS.*"));
 107                 query.addField(new Field("TRACK_STYLES.*"));
 108                 query.addField(new Field("STYLES.*"));
 109                 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
 110                 query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
 111                 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
 112                 query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
 113                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(artistId))));
 114                 query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
 115                 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
 116                 TrackLoader trackLoader = new TrackLoader();
 117                 database.process(query, trackLoader);
 118                 return trackLoader.all();
 119         }
 120
 121         public Collection<Group> getGroupsByArtist(String artistId) throws DatabaseException {
 122                 Query query = new Query(Type.SELECT, "GROUPS");
 123                 query.addField(new Field("GROUPS.*"));
 124                 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("GROUPS.ID"), new Field("GROUP_ARTISTS.GROUP_")));
 125                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.ARTIST", new StringParameter(artistId))));
 126                 return database.getMultiple(query, DefaultGroup.CREATOR);
 127         }
 128
 129         private class TrackLoader implements ResultProcessor {
 130
 131                 private final List<Track> loadedTracks = new ArrayList<Track>();
 132                 private Track track;
 133
 134                 public Track get() {
 135                         return loadedTracks.isEmpty() ? null : loadedTracks.get(0);
 136                 }
 137
 138                 public List<Track> all() {
 139                         return loadedTracks;
 140                 }
 141
 142                 /**
 143                  * {@inheritDoc}
 144                  */
 145                 public void processResult(ResultSet resultSet) throws SQLException {
 146                         String trackId = resultSet.getString("TRACKS.ID");
 147                         if ((track == null) || (!track.id().equals(trackId))) {
 148                                 track = new DefaultTrack(trackId).name(resultSet.getString("TRACKS.NAME")).artists(new ArrayList<Artist>()).styles(new HashSet<Style>());
 149                                 loadedTracks.add(track);
 150                         }
 151                         Artist artist = new LazyArtist(resultSet.getString("ARTISTS.ID")).name(resultSet.getString("ARTISTS.NAME"));
 152                         if (!track.artists().contains(artist)) {
 153                                 track.artists().add(artist);
 154                         }
 155                         Style style = new DefaultStyle(resultSet.getString("STYLES.ID")).name(resultSet.getString("STYLES.NAME"));
 156                         track.styles().add(style);
 157                 }
 158
 159         }
 160
 161         private class ArtistLoader implements ResultProcessor {
 162
 163                 private final List<Artist> artists = new ArrayList<Artist>();
 164                 private Artist artist;
 165
 166                 public Artist get() {
 167                         return artists.isEmpty() ? null : artists.get(0);
 168                 }
 169
 170                 public List<Artist> all() {
 171                         return artists;
 172                 }
 173
 174                 //
 175                 // RESULTPROCESSOR METHODS
 176                 //
 177
 178                 /**
 179                  * {@inheritDoc}
 180                  */
 181                 public void processResult(ResultSet resultSet) throws SQLException {
 182                         String artistId = resultSet.getString("ARTISTS.ID");
 183                         if ((artist == null) || (!artist.id().equals(artistId))) {
 184                                 artist = new LazyArtist(artistId).name(resultSet.getString("ARTISTS.NAME")).groups(new HashSet<Group>());
 185                                 artists.add(artist);
 186                         }
 187
 188                         Group group = new DefaultGroup(resultSet.getString("GROUPS.ID")).name(resultSet.getString("GROUPS.NAME")).url(resultSet.getString("GROUPS.URL"));
 189                         artist.groups().add(group);
 190                 }
 191
 192         }
 193
 194         private class LazyArtist extends DefaultArtist {
 195
 196                 private final Memoizer<Void> tracksMemoizer = new Memoizer<Void>(new Callable<Void>() {
 197                         public Void call() throws DatabaseException {
 198                                 if (!hasValue("tracks")) {
 199                                         value("tracks", Collection.class).set(getTracksByArtist(id()));
 200                                 }
 201                                 return null;
 202                         }
 203                 });
 204
 205                 public LazyArtist(String id) {
 206                         super(id);
 207                 }
 208
 209                 public Collection<Track> tracks() {
 210                         tracksMemoizer.get();
 211                         return super.tracks();
 212                 }
 213
 214         }
 215
 216 }