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