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