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.ObjectCreator;
  35 import net.pterodactylus.util.database.OrderField;
  36 import net.pterodactylus.util.database.OrderField.Order;
  37 import net.pterodactylus.util.database.Parameter.StringParameter;
  38 import net.pterodactylus.util.database.Query;
  39 import net.pterodactylus.util.database.Query.Type;
  40 import net.pterodactylus.util.database.ResultProcessor;
  41 import net.pterodactylus.util.database.ValueField;
  42 import net.pterodactylus.util.database.ValueFieldWhereClause;
  43
  44 /**
  45  * TODO
  46  *
  47  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  48  */
  49 public class DataManager {
  50
  51         private final ObjectCreator<Artist> artistCreator = new ArtistCreator();
  52         private final ObjectCreator<Group> groupCreator = new GroupCreator();
  53
  54         private final Database database;
  55
  56         public DataManager(Database database) {
  57                 this.database = database;
  58         }
  59
  60         public Collection<Artist> getAllArtists() throws DatabaseException {
  61                 Query query = new Query(Type.SELECT, "ARTISTS");
  62                 query.addField(new Field("ARTISTS.*"));
  63                 return database.getMultiple(query, artistCreator);
  64         }
  65
  66         public Artist getArtistById(String id) throws DatabaseException {
  67                 Query query = new Query(Type.SELECT, "ARTISTS");
  68                 query.addField(new Field("ARTISTS.*"));
  69                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(id))));
  70                 return database.getSingle(query, artistCreator);
  71         }
  72
  73         public Collection<Artist> getArtistsByGroup(String groupId) throws DatabaseException {
  74                 Query query = new Query(Type.SELECT, "ARTISTS");
  75                 query.addField(new Field("ARTISTS.*"));
  76                 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("ARTISTS.ID"), new Field("GROUP_ARTISTS.ARTIST")));
  77                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.GROUP_", new StringParameter(groupId))));
  78                 return database.getMultiple(query, artistCreator);
  79         }
  80
  81         public Track trackById(String id) throws DatabaseException {
  82                 Query query = new Query(Type.SELECT, "TRACKS");
  83                 query.addField(new Field("TRACKS.*"));
  84                 query.addField(new Field("TRACK_ARTISTS.*"));
  85                 query.addField(new Field("ARTISTS.*"));
  86                 query.addField(new Field("TRACK_STYLES.*"));
  87                 query.addField(new Field("STYLES.*"));
  88                 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
  89                 query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
  90                 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
  91                 query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
  92                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACKS.ID", new StringParameter(id))));
  93                 query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
  94                 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
  95                 TrackLoader trackLoader = new TrackLoader();
  96                 database.process(query, trackLoader);
  97                 return trackLoader.get();
  98         }
  99
 100         public Collection<Track> getTracksByArtist(String artistId) throws DatabaseException {
 101                 Query query = new Query(Type.SELECT, "TRACKS");
 102                 query.addField(new Field("TRACKS.*"));
 103                 query.addField(new Field("TRACK_ARTISTS.*"));
 104                 query.addField(new Field("ARTISTS.*"));
 105                 query.addField(new Field("TRACK_STYLES.*"));
 106                 query.addField(new Field("STYLES.*"));
 107                 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
 108                 query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
 109                 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
 110                 query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
 111                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(artistId))));
 112                 query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
 113                 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
 114                 TrackLoader trackLoader = new TrackLoader();
 115                 database.process(query, trackLoader);
 116                 return trackLoader.all();
 117         }
 118
 119         public Collection<Group> getGroupsByArtist(String artistId) throws DatabaseException {
 120                 Query query = new Query(Type.SELECT, "GROUPS");
 121                 query.addField(new Field("GROUPS.*"));
 122                 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("GROUPS.ID"), new Field("GROUP_ARTISTS.GROUP_")));
 123                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.ARTIST", new StringParameter(artistId))));
 124                 return database.getMultiple(query, groupCreator);
 125         }
 126
 127         private class TrackLoader implements ResultProcessor {
 128
 129                 private final List<Track> loadedTracks = new ArrayList<Track>();
 130                 private Track track;
 131
 132                 public Track get() {
 133                         return loadedTracks.isEmpty() ? null : loadedTracks.get(0);
 134                 }
 135
 136                 public List<Track> all() {
 137                         return loadedTracks;
 138                 }
 139
 140                 /**
 141                  * {@inheritDoc}
 142                  */
 143                 public void processResult(ResultSet resultSet) throws SQLException {
 144                         String trackId = resultSet.getString("TRACKS.ID");
 145                         if ((track == null) || (!track.id().equals(trackId))) {
 146                                 track = new DefaultTrack(trackId).name(resultSet.getString("TRACKS.NAME")).artists(new ArrayList<Artist>()).styles(new HashSet<Style>());
 147                                 loadedTracks.add(track);
 148                         }
 149                         Artist artist = new LazyArtist(resultSet.getString("ARTISTS.ID")).name(resultSet.getString("ARTISTS.NAME"));
 150                         if (!track.artists().contains(artist)) {
 151                                 track.artists().add(artist);
 152                         }
 153                         Style style = new DefaultStyle(resultSet.getString("STYLES.ID")).name(resultSet.getString("STYLES.NAME"));
 154                         track.styles().add(style);
 155                 }
 156
 157         }
 158
 159         private class ArtistLoader implements ResultProcessor {
 160
 161                 private final List<Artist> artists = new ArrayList<Artist>();
 162                 private Artist artist;
 163
 164                 public Artist get() {
 165                         return artists.isEmpty() ? null : artists.get(0);
 166                 }
 167
 168                 public List<Artist> all() {
 169                         return artists;
 170                 }
 171
 172                 //
 173                 // RESULTPROCESSOR METHODS
 174                 //
 175
 176                 /**
 177                  * {@inheritDoc}
 178                  */
 179                 public void processResult(ResultSet resultSet) throws SQLException {
 180                         String artistId = resultSet.getString("ARTISTS.ID");
 181                         if ((artist == null) || (!artist.id().equals(artistId))) {
 182                                 artist = new LazyArtist(artistId).name(resultSet.getString("ARTISTS.NAME")).groups(new HashSet<Group>());
 183                                 artists.add(artist);
 184                         }
 185
 186                         Group group = new DefaultGroup(resultSet.getString("GROUPS.ID")).name(resultSet.getString("GROUPS.NAME")).url(resultSet.getString("GROUPS.URL"));
 187                         artist.groups().add(group);
 188                 }
 189
 190         }
 191
 192         private class LazyArtist extends DefaultArtist {
 193
 194                 private final Memoizer<Void> tracksMemoizer = new Memoizer<Void>(new Callable<Void>() {
 195                         public Void call() throws DatabaseException {
 196                                 if (!hasValue("tracks")) {
 197                                         value("tracks", Collection.class).set(getTracksByArtist(id()));
 198                                 }
 199                                 return null;
 200                         }
 201                 });
 202
 203                 private final Memoizer<Void> groupsMemoizer = new Memoizer<Void>(new Callable<Void>() {
 204
 205                         @Override
 206                         public Void call() throws Exception {
 207                                 if (!hasValue("groups")) {
 208                                         value("groups", Collection.class).set(getGroupsByArtist(id()));
 209                                 }
 210                                 return null;
 211                         }
 212
 213                 });
 214
 215                 public LazyArtist(String id) {
 216                         super(id);
 217                 }
 218
 219                 /**
 220                  * {@inheritDoc}
 221                  */
 222                 @Override
 223                 public Collection<Group> groups() {
 224                         groupsMemoizer.get();
 225                         return super.groups();
 226                 }
 227
 228                 public Collection<Track> tracks() {
 229                         tracksMemoizer.get();
 230                         return super.tracks();
 231                 }
 232
 233         }
 234
 235         private class ArtistCreator implements ObjectCreator<Artist> {
 236
 237                 /**
 238                  * {@inheritDoc}
 239                  */
 240                 @Override
 241                 public Artist createObject(ResultSet resultSet) throws SQLException {
 242                         return new LazyArtist(resultSet.getString("ARTISTS.ID")).name(resultSet.getString("ARTISTS.NAME"));
 243                 }
 244
 245         }
 246
 247         private class LazyGroup extends DefaultGroup {
 248
 249                 private final Memoizer<Void> artistsMemoizer = new Memoizer<Void>(new Callable<Void>() {
 250
 251                         @Override
 252                         public Void call() throws Exception {
 253                                 if (!hasValue("artists")) {
 254                                         value("artists", Collection.class).set(getArtistsByGroup(id()));
 255                                 }
 256                                 return null;
 257                         }
 258
 259                 });
 260
 261                 public LazyGroup(String id) {
 262                         super(id);
 263                 }
 264
 265                 /**
 266                  * {@inheritDoc}
 267                  */
 268                 @Override
 269                 public Collection<Artist> artists() {
 270                         artistsMemoizer.get();
 271                         return super.artists();
 272                 }
 273
 274         }
 275
 276         private class GroupCreator implements ObjectCreator<Group> {
 277
 278                 /**
 279                  * {@inheritDoc}
 280                  */
 281                 @Override
 282                 public Group createObject(ResultSet resultSet) throws SQLException {
 283                         return new LazyGroup(resultSet.getString("GROUPS.ID")).name(resultSet.getString("GROUPS.NAME")).url(resultSet.getString("GROUPS.URL"));
 284                 }
 285
 286         }
 287
 288 }