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         private final ObjectCreator<Track> trackCreator = new TrackCreator();
  54
  55         private final Database database;
  56
  57         public DataManager(Database database) {
  58                 this.database = database;
  59         }
  60
  61         public Collection<Artist> getAllArtists() throws DatabaseException {
  62                 Query query = new Query(Type.SELECT, "ARTISTS");
  63                 query.addField(new Field("ARTISTS.*"));
  64                 return database.getMultiple(query, artistCreator);
  65         }
  66
  67         public Artist getArtistById(String id) throws DatabaseException {
  68                 Query query = new Query(Type.SELECT, "ARTISTS");
  69                 query.addField(new Field("ARTISTS.*"));
  70                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(id))));
  71                 return database.getSingle(query, artistCreator);
  72         }
  73
  74         public Collection<Artist> getArtistsByGroup(String groupId) throws DatabaseException {
  75                 Query query = new Query(Type.SELECT, "ARTISTS");
  76                 query.addField(new Field("ARTISTS.*"));
  77                 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("ARTISTS.ID"), new Field("GROUP_ARTISTS.ARTIST")));
  78                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.GROUP_", new StringParameter(groupId))));
  79                 return database.getMultiple(query, artistCreator);
  80         }
  81
  82         public Track trackById(String id) throws DatabaseException {
  83                 Query query = new Query(Type.SELECT, "TRACKS");
  84                 query.addField(new Field("TRACKS.*"));
  85                 query.addField(new Field("TRACK_ARTISTS.*"));
  86                 query.addField(new Field("ARTISTS.*"));
  87                 query.addField(new Field("TRACK_STYLES.*"));
  88                 query.addField(new Field("STYLES.*"));
  89                 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
  90                 query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
  91                 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
  92                 query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
  93                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACKS.ID", new StringParameter(id))));
  94                 query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
  95                 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
  96                 TrackLoader trackLoader = new TrackLoader();
  97                 database.process(query, trackLoader);
  98                 return trackLoader.get();
  99         }
 100
 101         public Collection<Track> getTracksByArtist(String artistId) throws DatabaseException {
 102                 Query query = new Query(Type.SELECT, "TRACKS");
 103                 query.addField(new Field("TRACKS.*"));
 104                 query.addField(new Field("TRACK_ARTISTS.*"));
 105                 query.addField(new Field("ARTISTS.*"));
 106                 query.addField(new Field("TRACK_STYLES.*"));
 107                 query.addField(new Field("STYLES.*"));
 108                 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
 109                 query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
 110                 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
 111                 query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
 112                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(artistId))));
 113                 query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
 114                 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
 115                 TrackLoader trackLoader = new TrackLoader();
 116                 database.process(query, trackLoader);
 117                 return trackLoader.all();
 118         }
 119
 120         public Collection<Group> getGroupsByArtist(String artistId) throws DatabaseException {
 121                 Query query = new Query(Type.SELECT, "GROUPS");
 122                 query.addField(new Field("GROUPS.*"));
 123                 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("GROUPS.ID"), new Field("GROUP_ARTISTS.GROUP_")));
 124                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.ARTIST", new StringParameter(artistId))));
 125                 return database.getMultiple(query, groupCreator);
 126         }
 127
 128         private class TrackLoader implements ResultProcessor {
 129
 130                 private final List<Track> loadedTracks = new ArrayList<Track>();
 131                 private Track track;
 132
 133                 public Track get() {
 134                         return loadedTracks.isEmpty() ? null : loadedTracks.get(0);
 135                 }
 136
 137                 public List<Track> all() {
 138                         return loadedTracks;
 139                 }
 140
 141                 /**
 142                  * {@inheritDoc}
 143                  */
 144                 public void processResult(ResultSet resultSet) throws SQLException {
 145                         String trackId = resultSet.getString("TRACKS.ID");
 146                         if ((track == null) || (!track.id().equals(trackId))) {
 147                                 track = new DefaultTrack(trackId).name(resultSet.getString("TRACKS.NAME")).artists(new ArrayList<Artist>()).styles(new HashSet<Style>());
 148                                 loadedTracks.add(track);
 149                         }
 150                         Artist artist = new LazyArtist(resultSet.getString("ARTISTS.ID")).name(resultSet.getString("ARTISTS.NAME"));
 151                         if (!track.artists().contains(artist)) {
 152                                 track.artists().add(artist);
 153                         }
 154                         Style style = new DefaultStyle(resultSet.getString("STYLES.ID")).name(resultSet.getString("STYLES.NAME"));
 155                         track.styles().add(style);
 156                 }
 157
 158         }
 159
 160         private class ArtistLoader implements ResultProcessor {
 161
 162                 private final List<Artist> artists = new ArrayList<Artist>();
 163                 private Artist artist;
 164
 165                 public Artist get() {
 166                         return artists.isEmpty() ? null : artists.get(0);
 167                 }
 168
 169                 public List<Artist> all() {
 170                         return artists;
 171                 }
 172
 173                 //
 174                 // RESULTPROCESSOR METHODS
 175                 //
 176
 177                 /**
 178                  * {@inheritDoc}
 179                  */
 180                 public void processResult(ResultSet resultSet) throws SQLException {
 181                         String artistId = resultSet.getString("ARTISTS.ID");
 182                         if ((artist == null) || (!artist.id().equals(artistId))) {
 183                                 artist = new LazyArtist(artistId).name(resultSet.getString("ARTISTS.NAME")).groups(new HashSet<Group>());
 184                                 artists.add(artist);
 185                         }
 186
 187                         Group group = new DefaultGroup(resultSet.getString("GROUPS.ID")).name(resultSet.getString("GROUPS.NAME")).url(resultSet.getString("GROUPS.URL"));
 188                         artist.groups().add(group);
 189                 }
 190
 191         }
 192
 193         private class LazyArtist extends DefaultArtist {
 194
 195                 private final Memoizer<Void> tracksMemoizer = new Memoizer<Void>(new Callable<Void>() {
 196                         public Void call() throws DatabaseException {
 197                                 if (!hasValue("tracks")) {
 198                                         value("tracks", Collection.class).set(getTracksByArtist(id()));
 199                                 }
 200                                 return null;
 201                         }
 202                 });
 203
 204                 private final Memoizer<Void> groupsMemoizer = new Memoizer<Void>(new Callable<Void>() {
 205
 206                         @Override
 207                         public Void call() throws Exception {
 208                                 if (!hasValue("groups")) {
 209                                         value("groups", Collection.class).set(getGroupsByArtist(id()));
 210                                 }
 211                                 return null;
 212                         }
 213
 214                 });
 215
 216                 public LazyArtist(String id) {
 217                         super(id);
 218                 }
 219
 220                 /**
 221                  * {@inheritDoc}
 222                  */
 223                 @Override
 224                 public Collection<Group> groups() {
 225                         groupsMemoizer.get();
 226                         return super.groups();
 227                 }
 228
 229                 public Collection<Track> tracks() {
 230                         tracksMemoizer.get();
 231                         return super.tracks();
 232                 }
 233
 234         }
 235
 236         private class ArtistCreator implements ObjectCreator<Artist> {
 237
 238                 /**
 239                  * {@inheritDoc}
 240                  */
 241                 @Override
 242                 public Artist createObject(ResultSet resultSet) throws SQLException {
 243                         return new LazyArtist(resultSet.getString("ARTISTS.ID")).name(resultSet.getString("ARTISTS.NAME"));
 244                 }
 245
 246         }
 247
 248         private class LazyGroup extends DefaultGroup {
 249
 250                 private final Memoizer<Void> artistsMemoizer = new Memoizer<Void>(new Callable<Void>() {
 251
 252                         @Override
 253                         public Void call() throws Exception {
 254                                 if (!hasValue("artists")) {
 255                                         value("artists", Collection.class).set(getArtistsByGroup(id()));
 256                                 }
 257                                 return null;
 258                         }
 259
 260                 });
 261
 262                 public LazyGroup(String id) {
 263                         super(id);
 264                 }
 265
 266                 /**
 267                  * {@inheritDoc}
 268                  */
 269                 @Override
 270                 public Collection<Artist> artists() {
 271                         artistsMemoizer.get();
 272                         return super.artists();
 273                 }
 274
 275         }
 276
 277         private class GroupCreator implements ObjectCreator<Group> {
 278
 279                 /**
 280                  * {@inheritDoc}
 281                  */
 282                 @Override
 283                 public Group createObject(ResultSet resultSet) throws SQLException {
 284                         return new LazyGroup(resultSet.getString("GROUPS.ID")).name(resultSet.getString("GROUPS.NAME")).url(resultSet.getString("GROUPS.URL"));
 285                 }
 286
 287         }
 288
 289         private class LazyTrack extends DefaultTrack {
 290
 291                 private final Memoizer<Void> artistsMemoizer = new Memoizer<Void>(new Callable<Void>() {
 292
 293                         @Override
 294                         public Void call() throws Exception {
 295                                 if (!hasValue("artists")) {
 296                                         value("artists", List.class).set(getArtistsByTrack(id()));
 297                                 }
 298                                 return null;
 299                         }
 300
 301                 });
 302
 303                 /**
 304                  * @param id
 305                  */
 306                 public LazyTrack(String id) {
 307                         super(id);
 308                 }
 309
 310                 /**
 311                  * {@inheritDoc}
 312                  */
 313                 @Override
 314                 public List<Artist> artists() {
 315                         artistsMemoizer.get();
 316                         return super.artists();
 317                 }
 318
 319                 /**
 320                  * {@inheritDoc}
 321                  */
 322                 @Override
 323                 public Collection<Style> styles() {
 324                         // TODO Auto-generated method stub
 325                         return super.styles();
 326                 }
 327
 328         }
 329
 330         private class TrackCreator implements ObjectCreator<Track> {
 331
 332                 /**
 333                  * {@inheritDoc}
 334                  */
 335                 @Override
 336                 public Track createObject(ResultSet resultSet) throws SQLException {
 337                         return new LazyTrack(resultSet.getString("TRACKS.ID")).name(resultSet.getString("TRACKS.NAME"));
 338                 }
 339
 340         }
 341
 342 }