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
  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.OrderField;
  33 import net.pterodactylus.util.database.OrderField.Order;
  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.ResultProcessor;
  38 import net.pterodactylus.util.database.ValueField;
  39 import net.pterodactylus.util.database.ValueFieldWhereClause;
  40
  41 /**
  42  * TODO
  43  *
  44  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  45  */
  46 public class DataManager {
  47
  48         private final Database database;
  49
  50         public DataManager(Database database) {
  51                 this.database = database;
  52         }
  53
  54         public Collection<Artist> getAllArtists() throws DatabaseException {
  55                 Query query = new Query(Type.SELECT, "ARTISTS");
  56                 query.addField(new Field("ARTISTS.*"));
  57                 query.addField(new Field("GROUP_ARTISTS.*"));
  58                 query.addField(new Field("GROUPS.*"));
  59                 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("ARTISTS.ID"), new Field("GROUP_ARTISTS.ARTIST")));
  60                 query.addJoin(new Join(JoinType.INNER, "GROUPS", new Field("GROUP_ARTISTS.GROUP_"), new Field("GROUPS.ID")));
  61                 query.addOrderField(new OrderField(new Field("ARTISTS.ID")));
  62                 ArtistLoader artistLoader = new ArtistLoader();
  63                 database.process(query, artistLoader);
  64                 return artistLoader.all();
  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.addField(new Field("GROUP_ARTISTS.*"));
  71                 query.addField(new Field("GROUPS.*"));
  72                 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("ARTISTS.ID"), new Field("GROUP_ARTISTS.ARTIST")));
  73                 query.addJoin(new Join(JoinType.INNER, "GROUPS", new Field("GROUP_ARTISTS.GROUP_"), new Field("GROUPS.ID")));
  74                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(id))));
  75                 query.addOrderField(new OrderField(new Field("ARTISTS.ID")));
  76                 ArtistLoader artistLoader = new ArtistLoader();
  77                 database.process(query, artistLoader);
  78                 return artistLoader.get();
  79         }
  80
  81         public Track trackById(String id) throws DatabaseException {
  82                 Query query = new Query(Type.SELECT, "TRACKS");
  83                 query.addField(new Field("TRACKS.*"));
  84                 query.addField(new Field("TRACK_ARTISTS.*"));
  85                 query.addField(new Field("ARTISTS.*"));
  86                 query.addField(new Field("TRACK_STYLES.*"));
  87                 query.addField(new Field("STYLES.*"));
  88                 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
  89                 query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
  90                 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
  91                 query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
  92                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACKS.ID", new StringParameter(id))));
  93                 query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
  94                 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
  95                 TrackLoader trackLoader = new TrackLoader();
  96                 database.process(query, trackLoader);
  97                 return trackLoader.get();
  98         }
  99
 100         public Collection<Track> getTracksByArtist(String artistId) throws DatabaseException {
 101                 Query query = new Query(Type.SELECT, "TRACKS");
 102                 query.addField(new Field("TRACKS.*"));
 103                 query.addField(new Field("TRACK_ARTISTS.*"));
 104                 query.addField(new Field("ARTISTS.*"));
 105                 query.addField(new Field("TRACK_STYLES.*"));
 106                 query.addField(new Field("STYLES.*"));
 107                 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
 108                 query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
 109                 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
 110                 query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
 111                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(artistId))));
 112                 query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
 113                 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
 114                 TrackLoader trackLoader = new TrackLoader();
 115                 database.process(query, trackLoader);
 116                 return trackLoader.all();
 117         }
 118
 119         private class TrackLoader implements ResultProcessor {
 120
 121                 private final List<Track> loadedTracks = new ArrayList<Track>();
 122                 private Track track;
 123
 124                 public Track get() {
 125                         return loadedTracks.isEmpty() ? null : loadedTracks.get(0);
 126                 }
 127
 128                 public List<Track> all() {
 129                         return loadedTracks;
 130                 }
 131
 132                 /**
 133                  * {@inheritDoc}
 134                  */
 135                 public void processResult(ResultSet resultSet) throws SQLException {
 136                         String trackId = resultSet.getString("TRACKS.ID");
 137                         if ((track == null) || (!track.id().equals(trackId))) {
 138                                 track = new DefaultTrack(trackId).name(resultSet.getString("TRACKS.NAME")).artists(new ArrayList<Artist>()).styles(new HashSet<Style>());
 139                                 loadedTracks.add(track);
 140                         }
 141                         Artist artist = new DefaultArtist(resultSet.getString("ARTISTS.ID")).name(resultSet.getString("ARTISTS.NAME"));
 142                         if (!track.artists().contains(artist)) {
 143                                 track.artists().add(artist);
 144                         }
 145                         Style style = new DefaultStyle(resultSet.getString("STYLES.ID")).name(resultSet.getString("STYLES.NAME"));
 146                         track.styles().add(style);
 147                 }
 148
 149         }
 150
 151         private class ArtistLoader implements ResultProcessor {
 152
 153                 private final List<Artist> artists = new ArrayList<Artist>();
 154                 private Artist artist;
 155
 156                 public Artist get() {
 157                         return artists.isEmpty() ? null : artists.get(0);
 158                 }
 159
 160                 public List<Artist> all() {
 161                         return artists;
 162                 }
 163
 164                 //
 165                 // RESULTPROCESSOR METHODS
 166                 //
 167
 168                 /**
 169                  * {@inheritDoc}
 170                  */
 171                 public void processResult(ResultSet resultSet) throws SQLException {
 172                         String artistId = resultSet.getString("ARTISTS.ID");
 173                         if ((artist == null) || (!artist.id().equals(artistId))) {
 174                                 artist = new DefaultArtist(artistId).name(resultSet.getString("ARTISTS.NAME")).groups(new HashSet<Group>());
 175                                 artists.add(artist);
 176                         }
 177
 178                         Group group = new DefaultGroup(resultSet.getString("GROUPS.ID")).name(resultSet.getString("GROUPS.NAME")).url(resultSet.getString("GROUPS.URL"));
 179                         artist.groups().add(group);
 180                 }
 181
 182         }
 183
 184 }