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