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();
52 private final ObjectCreator<Group> groupCreator = new GroupCreator();
53 private final ObjectCreator<Track> trackCreator = new TrackCreator();
55 private final Database database;
57 public DataManager(Database database) {
58 this.database = database;
61 public Collection<Artist> getAllArtists() throws DatabaseException {
62 Query query = new Query(Type.SELECT, "ARTISTS");
63 query.addField(new Field("ARTISTS.*"));
64 return database.getMultiple(query, artistCreator);
67 public Artist getArtistById(String id) throws DatabaseException {
68 Query query = new Query(Type.SELECT, "ARTISTS");
69 query.addField(new Field("ARTISTS.*"));
70 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(id))));
71 return database.getSingle(query, artistCreator);
74 public Collection<Artist> getArtistsByGroup(String groupId) throws DatabaseException {
75 Query query = new Query(Type.SELECT, "ARTISTS");
76 query.addField(new Field("ARTISTS.*"));
77 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("ARTISTS.ID"), new Field("GROUP_ARTISTS.ARTIST")));
78 query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.GROUP_", new StringParameter(groupId))));
79 return database.getMultiple(query, artistCreator);
82 public Track trackById(String id) throws DatabaseException {
83 Query query = new Query(Type.SELECT, "TRACKS");
84 query.addField(new Field("TRACKS.*"));
85 query.addField(new Field("TRACK_ARTISTS.*"));
86 query.addField(new Field("ARTISTS.*"));
87 query.addField(new Field("TRACK_STYLES.*"));
88 query.addField(new Field("STYLES.*"));
89 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
90 query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
91 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
92 query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
93 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACKS.ID", new StringParameter(id))));
94 query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
95 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
96 TrackLoader trackLoader = new TrackLoader();
97 database.process(query, trackLoader);
98 return trackLoader.get();
101 public Collection<Track> getTracksByArtist(String artistId) throws DatabaseException {
102 Query query = new Query(Type.SELECT, "TRACKS");
103 query.addField(new Field("TRACKS.*"));
104 query.addField(new Field("TRACK_ARTISTS.*"));
105 query.addField(new Field("ARTISTS.*"));
106 query.addField(new Field("TRACK_STYLES.*"));
107 query.addField(new Field("STYLES.*"));
108 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
109 query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
110 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
111 query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
112 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(artistId))));
113 query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
114 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
115 TrackLoader trackLoader = new TrackLoader();
116 database.process(query, trackLoader);
117 return trackLoader.all();
120 public Collection<Group> getGroupsByArtist(String artistId) throws DatabaseException {
121 Query query = new Query(Type.SELECT, "GROUPS");
122 query.addField(new Field("GROUPS.*"));
123 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("GROUPS.ID"), new Field("GROUP_ARTISTS.GROUP_")));
124 query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.ARTIST", new StringParameter(artistId))));
125 return database.getMultiple(query, groupCreator);
128 private class TrackLoader implements ResultProcessor {
130 private final List<Track> loadedTracks = new ArrayList<Track>();
134 return loadedTracks.isEmpty() ? null : loadedTracks.get(0);
137 public List<Track> all() {
144 public void processResult(ResultSet resultSet) throws SQLException {
145 String trackId = resultSet.getString("TRACKS.ID");
146 if ((track == null) || (!track.id().equals(trackId))) {
147 track = new DefaultTrack(trackId).name(resultSet.getString("TRACKS.NAME")).artists(new ArrayList<Artist>()).styles(new HashSet<Style>());
148 loadedTracks.add(track);
150 Artist artist = new LazyArtist(resultSet.getString("ARTISTS.ID")).name(resultSet.getString("ARTISTS.NAME"));
151 if (!track.artists().contains(artist)) {
152 track.artists().add(artist);
154 Style style = new DefaultStyle(resultSet.getString("STYLES.ID")).name(resultSet.getString("STYLES.NAME"));
155 track.styles().add(style);
160 private class ArtistLoader implements ResultProcessor {
162 private final List<Artist> artists = new ArrayList<Artist>();
163 private Artist artist;
165 public Artist get() {
166 return artists.isEmpty() ? null : artists.get(0);
169 public List<Artist> all() {
174 // RESULTPROCESSOR METHODS
180 public void processResult(ResultSet resultSet) throws SQLException {
181 String artistId = resultSet.getString("ARTISTS.ID");
182 if ((artist == null) || (!artist.id().equals(artistId))) {
183 artist = new LazyArtist(artistId).name(resultSet.getString("ARTISTS.NAME")).groups(new HashSet<Group>());
187 Group group = new DefaultGroup(resultSet.getString("GROUPS.ID")).name(resultSet.getString("GROUPS.NAME")).url(resultSet.getString("GROUPS.URL"));
188 artist.groups().add(group);
193 private class LazyArtist extends DefaultArtist {
195 private final Memoizer<Void> tracksMemoizer = new Memoizer<Void>(new Callable<Void>() {
196 public Void call() throws DatabaseException {
197 if (!hasValue("tracks")) {
198 value("tracks", Collection.class).set(getTracksByArtist(id()));
204 private final Memoizer<Void> groupsMemoizer = new Memoizer<Void>(new Callable<Void>() {
207 public Void call() throws Exception {
208 if (!hasValue("groups")) {
209 value("groups", Collection.class).set(getGroupsByArtist(id()));
216 public LazyArtist(String id) {
224 public Collection<Group> groups() {
225 groupsMemoizer.get();
226 return super.groups();
229 public Collection<Track> tracks() {
230 tracksMemoizer.get();
231 return super.tracks();
236 private class ArtistCreator implements ObjectCreator<Artist> {
242 public Artist createObject(ResultSet resultSet) throws SQLException {
243 return new LazyArtist(resultSet.getString("ARTISTS.ID")).name(resultSet.getString("ARTISTS.NAME"));
248 private class LazyGroup extends DefaultGroup {
250 private final Memoizer<Void> artistsMemoizer = new Memoizer<Void>(new Callable<Void>() {
253 public Void call() throws Exception {
254 if (!hasValue("artists")) {
255 value("artists", Collection.class).set(getArtistsByGroup(id()));
262 public LazyGroup(String id) {
270 public Collection<Artist> artists() {
271 artistsMemoizer.get();
272 return super.artists();
277 private class GroupCreator implements ObjectCreator<Group> {
283 public Group createObject(ResultSet resultSet) throws SQLException {
284 return new LazyGroup(resultSet.getString("GROUPS.ID")).name(resultSet.getString("GROUPS.NAME")).url(resultSet.getString("GROUPS.URL"));
289 private class LazyTrack extends DefaultTrack {
291 private final Memoizer<Void> artistsMemoizer = new Memoizer<Void>(new Callable<Void>() {
294 public Void call() throws Exception {
295 if (!hasValue("artists")) {
296 value("artists", List.class).set(getArtistsByTrack(id()));
306 public LazyTrack(String id) {
314 public List<Artist> artists() {
315 artistsMemoizer.get();
316 return super.artists();
323 public Collection<Style> styles() {
324 // TODO Auto-generated method stub
325 return super.styles();
330 private class TrackCreator implements ObjectCreator<Track> {
336 public Track createObject(ResultSet resultSet) throws SQLException {
337 return new LazyTrack(resultSet.getString("TRACKS.ID")).name(resultSet.getString("TRACKS.NAME"));