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.Collection;
  23 import java.util.List;
  24 import java.util.concurrent.Callable;
  25
  26 import net.pterodactylus.util.collection.Memoizer;
  27 import net.pterodactylus.util.database.Database;
  28 import net.pterodactylus.util.database.DatabaseException;
  29 import net.pterodactylus.util.database.Field;
  30 import net.pterodactylus.util.database.Join;
  31 import net.pterodactylus.util.database.Join.JoinType;
  32 import net.pterodactylus.util.database.ObjectCreator;
  33 import net.pterodactylus.util.database.OrderField;
  34 import net.pterodactylus.util.database.Parameter.StringParameter;
  35 import net.pterodactylus.util.database.Query;
  36 import net.pterodactylus.util.database.Query.Type;
  37 import net.pterodactylus.util.database.ValueField;
  38 import net.pterodactylus.util.database.ValueFieldWhereClause;
  39
  40 /**
  41  * TODO
  42  *
  43  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  44  */
  45 public class DataManager {
  46
  47         @SuppressWarnings("synthetic-access")
  48         private final ObjectCreator<Artist> artistCreator = new ArtistCreator();
  49         @SuppressWarnings("synthetic-access")
  50         private final ObjectCreator<Group> groupCreator = new GroupCreator();
  51         @SuppressWarnings("synthetic-access")
  52         private final ObjectCreator<Track> trackCreator = new TrackCreator();
  53         @SuppressWarnings("synthetic-access")
  54         private final ObjectCreator<Style> styleCreator = new StyleCreator();
  55
  56         private final Database database;
  57
  58         public DataManager(Database database) {
  59                 this.database = database;
  60         }
  61
  62         public Collection<Artist> getAllArtists() throws DatabaseException {
  63                 Query query = new Query(Type.SELECT, "ARTISTS");
  64                 query.addField(new Field("ARTISTS.*"));
  65                 return database.getMultiple(query, artistCreator);
  66         }
  67
  68         public Artist getArtistById(String id) throws DatabaseException {
  69                 Query query = new Query(Type.SELECT, "ARTISTS");
  70                 query.addField(new Field("ARTISTS.*"));
  71                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(id))));
  72                 return database.getSingle(query, artistCreator);
  73         }
  74
  75         public Collection<Artist> getArtistsByGroup(String groupId) throws DatabaseException {
  76                 Query query = new Query(Type.SELECT, "ARTISTS");
  77                 query.addField(new Field("ARTISTS.*"));
  78                 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("ARTISTS.ID"), new Field("GROUP_ARTISTS.ARTIST")));
  79                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.GROUP_", new StringParameter(groupId))));
  80                 return database.getMultiple(query, artistCreator);
  81         }
  82
  83         public List<Artist> getArtistsByTrack(String trackId) throws DatabaseException {
  84                 Query query = new Query(Type.SELECT, "ARTISTS");
  85                 query.addField(new Field("ARTISTS.*"));
  86                 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
  87                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_ARTISTS.TRACK", new StringParameter(trackId))));
  88                 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER")));
  89                 return database.getMultiple(query, artistCreator);
  90         }
  91
  92         public Track getTrackById(String id) throws DatabaseException {
  93                 Query query = new Query(Type.SELECT, "TRACKS");
  94                 query.addField(new Field("TRACKS.*"));
  95                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACKS.ID", new StringParameter(id))));
  96                 return database.getSingle(query, trackCreator);
  97         }
  98
  99         public Collection<Track> getTracksByArtist(String artistId) throws DatabaseException {
 100                 Query query = new Query(Type.SELECT, "TRACKS");
 101                 query.addField(new Field("TRACKS.*"));
 102                 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
 103                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_ARTISTS.ARTIST", new StringParameter(artistId))));
 104                 return database.getMultiple(query, trackCreator);
 105         }
 106
 107         public Collection<Group> getGroupsByArtist(String artistId) throws DatabaseException {
 108                 Query query = new Query(Type.SELECT, "GROUPS");
 109                 query.addField(new Field("GROUPS.*"));
 110                 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("GROUPS.ID"), new Field("GROUP_ARTISTS.GROUP_")));
 111                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.ARTIST", new StringParameter(artistId))));
 112                 return database.getMultiple(query, groupCreator);
 113         }
 114
 115         public Collection<Style> getStylesByTrack(String trackId) throws DatabaseException {
 116                 Query query = new Query(Type.SELECT, "STYLES");
 117                 query.addField(new Field("STYLES.*"));
 118                 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("STYLES.ID"), new Field("TRACK_STYLES.STYLE")));
 119                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_STYLES.TRACK", new StringParameter(trackId))));
 120                 return database.getMultiple(query, styleCreator);
 121         }
 122
 123         private class LazyArtist extends DefaultArtist {
 124
 125                 private final Memoizer<Void> tracksMemoizer = new Memoizer<Void>(new Callable<Void>() {
 126                         @Override
 127                         public Void call() throws DatabaseException {
 128                                 if (!hasValue("tracks")) {
 129                                         getValue("tracks", Collection.class).set(getTracksByArtist(getId()));
 130                                 }
 131                                 return null;
 132                         }
 133                 });
 134
 135                 private final Memoizer<Void> groupsMemoizer = new Memoizer<Void>(new Callable<Void>() {
 136
 137                         @Override
 138                         public Void call() throws Exception {
 139                                 if (!hasValue("groups")) {
 140                                         getValue("groups", Collection.class).set(getGroupsByArtist(getId()));
 141                                 }
 142                                 return null;
 143                         }
 144
 145                 });
 146
 147                 public LazyArtist(String id) {
 148                         super(id);
 149                 }
 150
 151                 /**
 152                  * {@inheritDoc}
 153                  */
 154                 @Override
 155                 public Collection<Group> getGroups() {
 156                         groupsMemoizer.get();
 157                         return super.getGroups();
 158                 }
 159
 160                 @Override
 161                 public Collection<Track> getTracks() {
 162                         tracksMemoizer.get();
 163                         return super.getTracks();
 164                 }
 165
 166         }
 167
 168         private class ArtistCreator implements ObjectCreator<Artist> {
 169
 170                 /**
 171                  * {@inheritDoc}
 172                  */
 173                 @Override
 174                 public Artist createObject(ResultSet resultSet) throws SQLException {
 175                         return new LazyArtist(resultSet.getString("ARTISTS.ID")).setName(resultSet.getString("ARTISTS.NAME"));
 176                 }
 177
 178         }
 179
 180         private class LazyGroup extends DefaultGroup {
 181
 182                 private final Memoizer<Void> artistsMemoizer = new Memoizer<Void>(new Callable<Void>() {
 183
 184                         @Override
 185                         public Void call() throws Exception {
 186                                 if (!hasValue("artists")) {
 187                                         getValue("artists", Collection.class).set(getArtistsByGroup(getId()));
 188                                 }
 189                                 return null;
 190                         }
 191
 192                 });
 193
 194                 public LazyGroup(String id) {
 195                         super(id);
 196                 }
 197
 198                 /**
 199                  * {@inheritDoc}
 200                  */
 201                 @Override
 202                 public Collection<Artist> getArtists() {
 203                         artistsMemoizer.get();
 204                         return super.getArtists();
 205                 }
 206
 207         }
 208
 209         private class GroupCreator implements ObjectCreator<Group> {
 210
 211                 /**
 212                  * {@inheritDoc}
 213                  */
 214                 @Override
 215                 public Group createObject(ResultSet resultSet) throws SQLException {
 216                         return new LazyGroup(resultSet.getString("GROUPS.ID")).setName(resultSet.getString("GROUPS.NAME")).setUrl(resultSet.getString("GROUPS.URL"));
 217                 }
 218
 219         }
 220
 221         private class LazyTrack extends DefaultTrack {
 222
 223                 private final Memoizer<Void> artistsMemoizer = new Memoizer<Void>(new Callable<Void>() {
 224
 225                         @Override
 226                         public Void call() throws Exception {
 227                                 if (!hasValue("artists")) {
 228                                         getValue("artists", List.class).set(getArtistsByTrack(getId()));
 229                                 }
 230                                 return null;
 231                         }
 232
 233                 });
 234
 235                 private final Memoizer<Void> stylesMemoizer = new Memoizer<Void>(new Callable<Void>() {
 236
 237                         @Override
 238                         public Void call() throws Exception {
 239                                 if (!hasValue("styles")) {
 240                                         getValue("styles", Collection.class).set(getStylesByTrack(getId()));
 241                                 }
 242                                 return null;
 243                         }
 244
 245                 });
 246
 247                 /**
 248                  * @param id
 249                  */
 250                 public LazyTrack(String id) {
 251                         super(id);
 252                 }
 253
 254                 /**
 255                  * {@inheritDoc}
 256                  */
 257                 @Override
 258                 public List<Artist> getArtists() {
 259                         artistsMemoizer.get();
 260                         return super.getArtists();
 261                 }
 262
 263                 /**
 264                  * {@inheritDoc}
 265                  */
 266                 @Override
 267                 public Collection<Style> getStyles() {
 268                         stylesMemoizer.get();
 269                         return super.getStyles();
 270                 }
 271
 272         }
 273
 274         private class TrackCreator implements ObjectCreator<Track> {
 275
 276                 /**
 277                  * {@inheritDoc}
 278                  */
 279                 @Override
 280                 public Track createObject(ResultSet resultSet) throws SQLException {
 281                         return new LazyTrack(resultSet.getString("TRACKS.ID")).setName(resultSet.getString("TRACKS.NAME"));
 282                 }
 283
 284         }
 285
 286         private class StyleCreator implements ObjectCreator<Style> {
 287
 288                 /**
 289                  * {@inheritDoc}
 290                  */
 291                 @Override
 292                 public Style createObject(ResultSet resultSet) throws SQLException {
 293                         return new DefaultStyle(resultSet.getString("STYLES.ID")).setName(resultSet.getString("STYLES.NAME"));
 294                 }
 295
 296         }
 297
 298 }