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.HashSet;
  24 import java.util.List;
  25
  26 import net.pterodactylus.util.database.Database;
  27 import net.pterodactylus.util.database.DatabaseException;
  28 import net.pterodactylus.util.database.Field;
  29 import net.pterodactylus.util.database.Join;
  30 import net.pterodactylus.util.database.Join.JoinType;
  31 import net.pterodactylus.util.database.OrderField;
  32 import net.pterodactylus.util.database.OrderField.Order;
  33 import net.pterodactylus.util.database.Parameter.StringParameter;
  34 import net.pterodactylus.util.database.Query;
  35 import net.pterodactylus.util.database.Query.Type;
  36 import net.pterodactylus.util.database.ResultProcessor;
  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 Database database;
  48
  49         public DataManager(Database database) {
  50                 this.database = database;
  51         }
  52
  53         public Track trackById(String id) throws DatabaseException {
  54                 Query query = new Query(Type.SELECT, "TRACKS");
  55                 query.addField(new Field("TRACKS.*"));
  56                 query.addField(new Field("TRACK_ARTISTS.*"));
  57                 query.addField(new Field("ARTISTS.*"));
  58                 query.addField(new Field("TRACK_STYLES.*"));
  59                 query.addField(new Field("STYLES.*"));
  60                 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
  61                 query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
  62                 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
  63                 query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
  64                 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACKS.ID", new StringParameter(id))));
  65                 query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
  66                 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
  67                 TrackLoader trackLoader = new TrackLoader();
  68                 database.process(query, trackLoader);
  69                 return trackLoader.get();
  70         }
  71
  72         private class TrackLoader implements ResultProcessor {
  73
  74                 private final List<Track> loadedTracks = new ArrayList<Track>();
  75                 private Track track;
  76
  77                 /**
  78                  * {@inheritDoc}
  79                  */
  80                 public void processResult(ResultSet resultSet) throws SQLException {
  81                         String trackId = resultSet.getString("TRACKS.ID");
  82                         if ((track == null) || (!track.id().equals(trackId))) {
  83                                 track = new AbstractTrack(trackId) {
  84
  85                                         public void save() {
  86                                                 if (!dirty()) {
  87                                                         return;
  88                                                 }
  89                                         }
  90                                 }.name(resultSet.getString("TRACKS.NAME")).artists(new ArrayList<Artist>()).styles(new HashSet<Style>());
  91                                 loadedTracks.add(track);
  92                         }
  93                         Artist artist = new AbstractArtist(resultSet.getString("ARTISTS.ID")) {
  94
  95                                 public void save() {
  96                                 }
  97
  98                         }.name(resultSet.getString("ARTISTS.NAME"));
  99                         if (!track.artists().contains(artist)) {
 100                                 track.artists().add(artist);
 101                         }
 102                         Style style = new AbstractStyle(resultSet.getString("STYLES.ID")) {
 103
 104                                 public void save() {
 105                                 }
 106
 107                         }.name(resultSet.getString("STYLES.NAME"));
 108                         track.styles().add(style);
 109                 }
 110
 111                 public Track get() {
 112                         return loadedTracks.isEmpty() ? null : loadedTracks.get(0);
 113                 }
 114
 115         }
 116
 117 }