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