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