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.Collection;
24 import java.util.HashSet;
25 import java.util.List;
26 import java.util.concurrent.Callable;
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;
47 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
49 public class DataManager {
51 private final ObjectCreator<Artist> artistCreator = new ArtistCreator();
53 private final Database database;
55 public DataManager(Database database) {
56 this.database = database;
59 public Collection<Artist> getAllArtists() throws DatabaseException {
60 Query query = new Query(Type.SELECT, "ARTISTS");
61 query.addField(new Field("ARTISTS.*"));
62 query.addField(new Field("GROUP_ARTISTS.*"));
63 query.addField(new Field("GROUPS.*"));
64 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("ARTISTS.ID"), new Field("GROUP_ARTISTS.ARTIST")));
65 query.addJoin(new Join(JoinType.INNER, "GROUPS", new Field("GROUP_ARTISTS.GROUP_"), new Field("GROUPS.ID")));
66 query.addOrderField(new OrderField(new Field("ARTISTS.ID")));
67 ArtistLoader artistLoader = new ArtistLoader();
68 database.process(query, artistLoader);
69 return artistLoader.all();
72 public Artist getArtistById(String id) throws DatabaseException {
73 Query query = new Query(Type.SELECT, "ARTISTS");
74 query.addField(new Field("ARTISTS.*"));
75 query.addField(new Field("GROUP_ARTISTS.*"));
76 query.addField(new Field("GROUPS.*"));
77 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("ARTISTS.ID"), new Field("GROUP_ARTISTS.ARTIST")));
78 query.addJoin(new Join(JoinType.INNER, "GROUPS", new Field("GROUP_ARTISTS.GROUP_"), new Field("GROUPS.ID")));
79 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(id))));
80 query.addOrderField(new OrderField(new Field("ARTISTS.ID")));
81 ArtistLoader artistLoader = new ArtistLoader();
82 database.process(query, artistLoader);
83 return artistLoader.get();
86 public Track trackById(String id) throws DatabaseException {
87 Query query = new Query(Type.SELECT, "TRACKS");
88 query.addField(new Field("TRACKS.*"));
89 query.addField(new Field("TRACK_ARTISTS.*"));
90 query.addField(new Field("ARTISTS.*"));
91 query.addField(new Field("TRACK_STYLES.*"));
92 query.addField(new Field("STYLES.*"));
93 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
94 query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
95 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
96 query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
97 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACKS.ID", new StringParameter(id))));
98 query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
99 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
100 TrackLoader trackLoader = new TrackLoader();
101 database.process(query, trackLoader);
102 return trackLoader.get();
105 public Collection<Track> getTracksByArtist(String artistId) throws DatabaseException {
106 Query query = new Query(Type.SELECT, "TRACKS");
107 query.addField(new Field("TRACKS.*"));
108 query.addField(new Field("TRACK_ARTISTS.*"));
109 query.addField(new Field("ARTISTS.*"));
110 query.addField(new Field("TRACK_STYLES.*"));
111 query.addField(new Field("STYLES.*"));
112 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
113 query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
114 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
115 query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
116 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(artistId))));
117 query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
118 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
119 TrackLoader trackLoader = new TrackLoader();
120 database.process(query, trackLoader);
121 return trackLoader.all();
124 public Collection<Group> getGroupsByArtist(String artistId) throws DatabaseException {
125 Query query = new Query(Type.SELECT, "GROUPS");
126 query.addField(new Field("GROUPS.*"));
127 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("GROUPS.ID"), new Field("GROUP_ARTISTS.GROUP_")));
128 query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.ARTIST", new StringParameter(artistId))));
129 return database.getMultiple(query, DefaultGroup.CREATOR);
132 private class TrackLoader implements ResultProcessor {
134 private final List<Track> loadedTracks = new ArrayList<Track>();
138 return loadedTracks.isEmpty() ? null : loadedTracks.get(0);
141 public List<Track> all() {
148 public void processResult(ResultSet resultSet) throws SQLException {
149 String trackId = resultSet.getString("TRACKS.ID");
150 if ((track == null) || (!track.id().equals(trackId))) {
151 track = new DefaultTrack(trackId).name(resultSet.getString("TRACKS.NAME")).artists(new ArrayList<Artist>()).styles(new HashSet<Style>());
152 loadedTracks.add(track);
154 Artist artist = new LazyArtist(resultSet.getString("ARTISTS.ID")).name(resultSet.getString("ARTISTS.NAME"));
155 if (!track.artists().contains(artist)) {
156 track.artists().add(artist);
158 Style style = new DefaultStyle(resultSet.getString("STYLES.ID")).name(resultSet.getString("STYLES.NAME"));
159 track.styles().add(style);
164 private class ArtistLoader implements ResultProcessor {
166 private final List<Artist> artists = new ArrayList<Artist>();
167 private Artist artist;
169 public Artist get() {
170 return artists.isEmpty() ? null : artists.get(0);
173 public List<Artist> all() {
178 // RESULTPROCESSOR METHODS
184 public void processResult(ResultSet resultSet) throws SQLException {
185 String artistId = resultSet.getString("ARTISTS.ID");
186 if ((artist == null) || (!artist.id().equals(artistId))) {
187 artist = new LazyArtist(artistId).name(resultSet.getString("ARTISTS.NAME")).groups(new HashSet<Group>());
191 Group group = new DefaultGroup(resultSet.getString("GROUPS.ID")).name(resultSet.getString("GROUPS.NAME")).url(resultSet.getString("GROUPS.URL"));
192 artist.groups().add(group);
197 private class LazyArtist extends DefaultArtist {
199 private final Memoizer<Void> tracksMemoizer = new Memoizer<Void>(new Callable<Void>() {
200 public Void call() throws DatabaseException {
201 if (!hasValue("tracks")) {
202 value("tracks", Collection.class).set(getTracksByArtist(id()));
208 private final Memoizer<Void> groupsMemoizer = new Memoizer<Void>(new Callable<Void>() {
211 public Void call() throws Exception {
212 if (!hasValue("groups")) {
213 value("groups", Collection.class).set(getGroupsByArtist(id()));
220 public LazyArtist(String id) {
228 public Collection<Group> groups() {
229 groupsMemoizer.get();
230 return super.groups();
233 public Collection<Track> tracks() {
234 tracksMemoizer.get();
235 return super.tracks();
240 private class ArtistCreator implements ObjectCreator<Artist> {
246 public Artist createObject(ResultSet resultSet) throws SQLException {
247 return new LazyArtist(resultSet.getString("ARTISTS.ID")).name(resultSet.getString("ARTISTS.NAME"));