2 * DemosceneMusic - DataManager.java - Copyright © 2012 David Roden
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.
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.
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/>.
18 package net.pterodactylus.demoscenemusic.data;
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;
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;
43 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
45 public class DataManager {
47 private final Database database;
49 public DataManager(Database database) {
50 this.database = database;
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();
72 private class TrackLoader implements ResultProcessor {
74 private final List<Track> loadedTracks = new ArrayList<Track>();
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) {
90 }.name(resultSet.getString("TRACKS.NAME")).artists(new ArrayList<Artist>()).styles(new HashSet<Style>());
91 loadedTracks.add(track);
93 Artist artist = new AbstractArtist(resultSet.getString("ARTISTS.ID")) {
98 }.name(resultSet.getString("ARTISTS.NAME"));
99 if (!track.artists().contains(artist)) {
100 track.artists().add(artist);
102 Style style = new AbstractStyle(resultSet.getString("STYLES.ID")) {
107 }.name(resultSet.getString("STYLES.NAME"));
108 track.styles().add(style);
112 return loadedTracks.isEmpty() ? null : loadedTracks.get(0);