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.Collection;
23 import java.util.EnumMap;
24 import java.util.HashSet;
25 import java.util.List;
27 import java.util.Map.Entry;
28 import java.util.UUID;
29 import java.util.concurrent.Callable;
31 import net.pterodactylus.demoscenemusic.data.Track.Relationship;
32 import net.pterodactylus.util.collection.Memoizer;
33 import net.pterodactylus.util.database.Database;
34 import net.pterodactylus.util.database.DatabaseException;
35 import net.pterodactylus.util.database.Field;
36 import net.pterodactylus.util.database.Join;
37 import net.pterodactylus.util.database.Join.JoinType;
38 import net.pterodactylus.util.database.ObjectCreator;
39 import net.pterodactylus.util.database.ObjectCreator.StringCreator;
40 import net.pterodactylus.util.database.OrderField;
41 import net.pterodactylus.util.database.Parameter.IntegerParameter;
42 import net.pterodactylus.util.database.Parameter.StringParameter;
43 import net.pterodactylus.util.database.Query;
44 import net.pterodactylus.util.database.Query.Type;
45 import net.pterodactylus.util.database.ResultProcessor;
46 import net.pterodactylus.util.database.ValueField;
47 import net.pterodactylus.util.database.ValueFieldWhereClause;
50 * Interface between the database and the application.
52 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
54 public class DataManager {
56 /** The artist object creator. */
57 @SuppressWarnings("synthetic-access")
58 private final ObjectCreator<Artist> artistCreator = new ArtistCreator();
60 /** The group object creator. */
61 @SuppressWarnings("synthetic-access")
62 private final ObjectCreator<Group> groupCreator = new GroupCreator();
64 /** The track object creator. */
65 @SuppressWarnings("synthetic-access")
66 private final ObjectCreator<Track> trackCreator = new TrackCreator();
68 /** The track object creator. */
69 @SuppressWarnings("synthetic-access")
70 private final ObjectCreator<TrackDerivative> trackDerivativeCreator = new TrackDerivativeCreator();
72 /** The style object creator. */
73 @SuppressWarnings("synthetic-access")
74 private final ObjectCreator<Style> styleCreator = new StyleCreator();
76 /** The {@link User} object creator. */
77 @SuppressWarnings("synthetic-access")
78 private final ObjectCreator<User> userCreator = new UserCreator();
81 private final Database database;
84 * Creates a new data manager.
87 * The database to operate on
89 public DataManager(Database database) {
90 this.database = database;
94 * Returns all artists.
97 * @throws DatabaseException
98 * if a database error occurs
100 public Collection<Artist> getAllArtists() throws DatabaseException {
101 Query query = new Query(Type.SELECT, "ARTISTS");
102 query.addField(new Field("ARTISTS.*"));
103 return loadArtistProperties(database.getMultiple(query, artistCreator));
107 * Returns the artist with the given ID.
110 * The ID of the artist
111 * @return The artist with the given ID, or {@code null} if there is no
112 * artist with the given ID
113 * @throws DatabaseException
114 * if a database error occurs
116 public Artist getArtistById(String id) throws DatabaseException {
117 Query query = new Query(Type.SELECT, "ARTISTS");
118 query.addField(new Field("ARTISTS.*"));
119 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(id))));
120 return loadArtistProperties(database.getSingle(query, artistCreator));
124 * Returns all artists that belong to the group with the given ID.
127 * The ID of the group
128 * @return All artists belonging to the given group
129 * @throws DatabaseException
130 * if a database error occurs
132 public Collection<Artist> getArtistsByGroup(String groupId) throws DatabaseException {
133 Query query = new Query(Type.SELECT, "ARTISTS");
134 query.addField(new Field("ARTISTS.*"));
135 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("ARTISTS.ID"), new Field("GROUP_ARTISTS.ARTIST")));
136 query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.GROUP_", new StringParameter(groupId))));
137 return loadArtistProperties(database.getMultiple(query, artistCreator));
141 * Returns all artists involved in the track with the given ID.
144 * The ID of the track
145 * @return All artists involved in the track, in preferred order
146 * @throws DatabaseException
147 * if a database error occurs
149 public List<Artist> getArtistsByTrack(String trackId) throws DatabaseException {
150 Query query = new Query(Type.SELECT, "ARTISTS");
151 query.addField(new Field("ARTISTS.*"));
152 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
153 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_ARTISTS.TRACK", new StringParameter(trackId))));
154 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER")));
155 return loadArtistProperties(database.getMultiple(query, artistCreator));
159 * Creates a new artist with the given name.
162 * The name of the artist
163 * @return The created artist
164 * @throws DatabaseException
165 * if a database error occurs
167 public Artist createArtist(String name) throws DatabaseException {
168 Query query = new Query(Type.INSERT, "ARTISTS");
169 String id = UUID.randomUUID().toString();
170 query.addValueField(new ValueField("ID", new StringParameter(id)));
171 query.addValueField(new ValueField("NAME", new StringParameter(name)));
172 database.insert(query);
173 return loadArtistProperties(getArtistById(id));
177 * Saves the given artist.
181 * @throws DatabaseException
182 * if a database error occurs
184 public void saveArtist(Artist artist) throws DatabaseException {
185 Query query = new Query(Type.UPDATE, "ARTISTS");
186 query.addValueField(new ValueField("NAME", new StringParameter(artist.getName())));
187 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ID", new StringParameter(artist.getId()))));
188 database.update(query);
189 saveArtistProperties(artist);
193 * Saves the properties of the given artist.
196 * The artist whose properties to save
197 * @throws DatabaseException
198 * if a database error occurs
200 public void saveArtistProperties(Artist artist) throws DatabaseException {
201 saveProperties(artist.getProperties(), "ARTIST_PROPERTIES", "ARTIST", artist.getId());
205 * Saves the given properties to the given table for the given principal.
208 * The properties to save
210 * The table in which to save the properties
212 * The type of the principal (e. g. “ARTIST” or “TRACK”)
214 * The ID of the principial
215 * @throws DatabaseException
216 * if a database error occurs
218 public void saveProperties(Properties properties, String table, String type, String id) throws DatabaseException {
219 if (!properties.isDirty()) {
222 Query query = new Query(Type.DELETE, table);
223 query.addWhereClause(new ValueFieldWhereClause(new ValueField(type, new StringParameter(id))));
224 database.update(query);
225 for (Entry<String, String> property : properties) {
226 Query insertQuery = new Query(Type.INSERT, table);
227 insertQuery.addValueField(new ValueField(type, new StringParameter(id)));
228 insertQuery.addValueField(new ValueField("PROPERTY", new StringParameter(property.getKey())));
229 insertQuery.addValueField(new ValueField("VALUE", new StringParameter(property.getValue())));
230 database.insert(insertQuery);
232 properties.resetDirty();
236 * Loads the properties for an artist.
239 * The artist to load the properties for
241 * @throws DatabaseException
242 * if a database error occurs
244 public Artist loadArtistProperties(final Artist artist) throws DatabaseException {
245 return loadProperties(artist, "ARTIST_PROPERTIES", "ARTIST");
249 * Loads the properties of all given artists.
252 * The artists to load the properties for
253 * @return The list of artists
254 * @throws DatabaseException
255 * if a database error occurs
257 public List<Artist> loadArtistProperties(List<Artist> artists) throws DatabaseException {
258 for (Artist artist : artists) {
259 loadArtistProperties(artist);
265 * Returns all remix artists involved in the track with the given ID.
268 * The ID of the track
269 * @return All remix artists involved in the track, in preferred order
270 * @throws DatabaseException
271 * if a database error occurs
273 public List<Artist> getRemixArtistsByTrack(String trackId) throws DatabaseException {
274 Query query = new Query(Type.SELECT, "ARTISTS");
275 query.addField(new Field("ARTISTS.*"));
276 query.addJoin(new Join(JoinType.INNER, "TRACK_REMIX_ARTISTS", new Field("TRACK_REMIX_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
277 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_REMIX_ARTISTS.TRACK", new StringParameter(trackId))));
278 query.addOrderField(new OrderField(new Field("TRACK_REMIX_ARTISTS.DISPLAY_ORDER")));
279 return database.getMultiple(query, artistCreator);
283 * Returns all related tracks for the track with the given ID.
286 * The ID of the tracks
287 * @return A mapping from relationship to all tracks that match the relation
288 * @throws DatabaseException
289 * if a database error occurs
291 public Map<Relationship, Collection<Track>> getRelatedTracksByTrack(String trackId) throws DatabaseException {
292 Query query = new Query(Type.SELECT, "TRACKS");
293 query.addField(new Field("TRACKS.*"));
294 query.addField(new Field("TRACK_RELATIONS.*"));
295 query.addJoin(new Join(JoinType.INNER, "TRACK_RELATIONS", new Field("TRACK_RELATIONS.TRACK"), new Field("TRACK_RELATIONS.RELATED_TRACK")));
296 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_RELATIONS.TRACK", new StringParameter(trackId))));
297 final Map<Relationship, Collection<Track>> relatedTracks = new EnumMap<Relationship, Collection<Track>>(Relationship.class);
298 database.process(query, new ResultProcessor() {
301 @SuppressWarnings("synthetic-access")
302 public void processResult(ResultSet resultSet) throws SQLException {
303 Track track = trackCreator.createObject(resultSet);
304 Relationship relationship = Relationship.valueOf(resultSet.getString("TRACK_RELATIONS.RELATIONSHIP"));
305 if (!relatedTracks.containsKey(relationship)) {
306 relatedTracks.put(relationship, new HashSet<Track>());
308 relatedTracks.get(relationship).add(track);
311 return relatedTracks;
315 * Returns the track with the given ID.
318 * The ID of the track
319 * @return The track with the given ID, or {@code null} if there is no such
321 * @throws DatabaseException
322 * if a database error occurs
324 public Track getTrackById(String id) throws DatabaseException {
325 Query query = new Query(Type.SELECT, "TRACKS");
326 query.addField(new Field("TRACKS.*"));
327 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACKS.ID", new StringParameter(id))));
328 return loadTrackProperties(database.getSingle(query, trackCreator));
332 * Returns all tracks by the artist with the given ID.
335 * The ID of the artist
336 * @return All tracks by the given artist
337 * @throws DatabaseException
338 * if a database error occurs
340 public Collection<Track> getTracksByArtist(String artistId) throws DatabaseException {
341 Query query = new Query(Type.SELECT, "TRACKS");
342 query.addField(new Field("TRACKS.*"));
343 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
344 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_ARTISTS.ARTIST", new StringParameter(artistId))));
345 return loadTrackProperties(database.getMultiple(query, trackCreator));
349 * Loads the properties for the given track.
352 * The track for which to load the properties
353 * @return The track with the properties loaded
354 * @throws DatabaseException
355 * if a database error occurs
357 public Track loadTrackProperties(Track track) throws DatabaseException {
358 return loadProperties(track, "TRACK_PROPERTIES", "TRACK");
362 * Loads the properties for the given tracks.
365 * The tracks for which to load the properties
366 * @return The tracks with the properties loaded
367 * @throws DatabaseException
368 * if a database error occurs
370 public List<Track> loadTrackProperties(List<Track> tracks) throws DatabaseException {
371 for (Track track : tracks) {
372 loadTrackProperties(track);
378 * Creates a new track with the given name.
381 * The name of the track
382 * @return The created track
383 * @throws DatabaseException
384 * if a database error occurs
386 public Track createTrack(String name) throws DatabaseException {
387 Query query = new Query(Type.INSERT, "TRACKS");
388 String id = UUID.randomUUID().toString();
389 query.addValueField(new ValueField("ID", new StringParameter(id)));
390 query.addValueField(new ValueField("NAME", new StringParameter(name)));
391 database.insert(query);
392 return getTrackById(id);
396 * Saves the given track. This also saves all relationships of the track.
400 * @throws DatabaseException
401 * if a database error occurs
403 public void saveTrack(Track track) throws DatabaseException {
404 Query query = new Query(Type.UPDATE, "TRACKS");
405 query.addValueField(new ValueField("TRACKS.NAME", new StringParameter(track.getName())));
406 query.addValueField(new ValueField("TRACKS.REMIX", new StringParameter(track.getRemix())));
407 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACKS.ID", new StringParameter(track.getId()))));
408 database.update(query);
409 /* store artist information. */
410 track.getArtists(); /* prefetch artists. */
411 query = new Query(Type.DELETE, "TRACK_ARTISTS");
412 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_ARTISTS.TRACK", new StringParameter(track.getId()))));
413 database.update(query);
414 for (int index = 0; index < track.getArtists().size(); ++index) {
415 query = new Query(Type.INSERT, "TRACK_ARTISTS");
416 query.addValueField(new ValueField("TRACK_ARTISTS.TRACK", new StringParameter(track.getId())));
417 query.addValueField(new ValueField("TRACK_ARTISTS.ARTIST", new StringParameter(track.getArtists().get(index).getId())));
418 query.addValueField(new ValueField("TRACK_ARTISTS.DISPLAY_ORDER", new IntegerParameter(index + 1)));
419 database.insert(query);
421 /* store properties. */
422 saveProperties(track.getProperties(), "TRACK_PROPERTIES", "TRACK", track.getId());
426 * Returns the derivative with the given ID.
429 * The ID of the derivatives to load
430 * @return The derivative with the given ID
431 * @throws DatabaseException
432 * if a database error occurs
434 public TrackDerivative getTrackDerivativeById(String id) throws DatabaseException {
435 Query query = new Query(Type.SELECT, "TRACK_DERIVATIVES");
436 query.addField(new Field("TRACK_DERIVATIVES.*"));
437 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_DERIVATIVES.ID", new StringParameter(id))));
438 return loadTrackDerivativeProperties(database.getSingle(query, trackDerivativeCreator));
442 * Returns the derivatives for the given track.
445 * The track ID to get the derivatives for
446 * @return The derivatives for the given track
447 * @throws DatabaseException
448 * if a database error occurs
450 public Collection<TrackDerivative> getTrackDerivativesByTrack(String trackId) throws DatabaseException {
451 Query query = new Query(Type.SELECT, "TRACK_DERIVATIVES");
452 query.addField(new Field("TRACK_DERIVATIVES.*"));
453 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_DERIVATIVES.TRACK", new StringParameter(trackId))));
454 return loadTrackDerivativeProperties(database.getMultiple(query, trackDerivativeCreator));
458 * Creates a new derivative for the given track.
461 * The track to create the derivative for
462 * @return The created derivative
463 * @throws DatabaseException
464 * if a database error occurs
466 public TrackDerivative createTrackDerivative(Track track) throws DatabaseException {
467 Query query = new Query(Type.INSERT, "TRACK_DERIVATIVES");
468 String id = UUID.randomUUID().toString();
469 query.addValueField(new ValueField("TRACK_DERIVATIVES.ID", new StringParameter(id)));
470 query.addValueField(new ValueField("TRACK_DERIVATIVES.TRACK", new StringParameter(track.getId())));
471 database.insert(query);
472 return getTrackDerivativeById(id);
476 * Loads the properties for the given track derivative.
478 * @param trackDerivative
479 * The track derivative to load the properties for
480 * @return The track derivative with its properties loaded
481 * @throws DatabaseException
482 * if a database error occurs
484 public TrackDerivative loadTrackDerivativeProperties(TrackDerivative trackDerivative) throws DatabaseException {
485 return loadProperties(trackDerivative, "TRACK_DERIVATIVE_PROPERTIES", "TRACK_DERIVATIVE");
489 * Loads the properties for the given track derivatives.
491 * @param trackDerivatives
492 * The track derivatives to load the properties for
493 * @return The track derivatives with their properties loaded
494 * @throws DatabaseException
495 * if a database error occurs
497 public List<TrackDerivative> loadTrackDerivativeProperties(List<TrackDerivative> trackDerivatives) throws DatabaseException {
498 for (TrackDerivative trackDerivative : trackDerivatives) {
499 loadTrackDerivativeProperties(trackDerivative);
501 return trackDerivatives;
505 * Saves the given track derivative. As a track derivative does not have any
506 * attributes of its own only its properties are saved.
508 * @param trackDerivative
509 * The track derivative to save
510 * @throws DatabaseException
511 * if a database error occurs
513 public void saveTrackDerivate(TrackDerivative trackDerivative) throws DatabaseException {
514 saveProperties(trackDerivative.getProperties(), "TRACK_DERIVATIVE_PROPERTIES", "TRACK_DERIVATIVE", trackDerivative.getId());
518 * Returns all groups the artist with the given ID belongs to.
521 * The ID of the artist
522 * @return All groups the artist belongs to
523 * @throws DatabaseException
524 * if a database error occurs
526 public Collection<Group> getGroupsByArtist(String artistId) throws DatabaseException {
527 Query query = new Query(Type.SELECT, "GROUPS");
528 query.addField(new Field("GROUPS.*"));
529 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("GROUPS.ID"), new Field("GROUP_ARTISTS.GROUP_")));
530 query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.ARTIST", new StringParameter(artistId))));
531 return database.getMultiple(query, groupCreator);
535 * Returns all styles for the track with the given ID.
538 * The ID of the track
539 * @return All styles for the given track
540 * @throws DatabaseException
541 * if a database error occurs
543 public Collection<Style> getStylesByTrack(String trackId) throws DatabaseException {
544 Query query = new Query(Type.SELECT, "STYLES");
545 query.addField(new Field("STYLES.*"));
546 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("STYLES.ID"), new Field("TRACK_STYLES.STYLE")));
547 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_STYLES.TRACK", new StringParameter(trackId))));
548 return database.getMultiple(query, styleCreator);
552 * Returns the user with the given name.
555 * The name of the user
556 * @return The user, or {@code null} if the user does not exist
557 * @throws DatabaseException
558 * if a database error occurs
560 public User getUserByName(String username) throws DatabaseException {
561 Query query = new Query(Type.SELECT, "USERS");
562 query.addField(new Field("USERS.*"));
563 query.addWhereClause(new ValueFieldWhereClause(new ValueField("USERS.NAME", new StringParameter(username))));
564 return database.getSingle(query, userCreator);
568 * Returns the user connected with the given OpenID.
571 * The OpenID to find the user for
572 * @return The user connected with the given OpenID, or {@code null} if
573 * there is no such user
574 * @throws DatabaseException
575 * if a database error occurs
577 public User getUserByOpenId(String openId) throws DatabaseException {
578 Query query = new Query(Type.SELECT, "USERS");
579 query.addField(new Field("USERS.*"));
580 query.addJoin(new Join(JoinType.INNER, "USER_OPENIDS", new Field("USER_OPENIDS.USER"), new Field("USERS.ID")));
581 query.addWhereClause(new ValueFieldWhereClause(new ValueField("USER_OPENIDS.OPENID", new StringParameter(openId))));
582 return database.getSingle(query, userCreator);
586 * Returns all OpenIDs connected with the user with the given ID.
590 * @return All OpenIDs connected with the given user
591 * @throws DatabaseException
592 * if a database error occurs
594 public Collection<String> getOpenIdsByUser(String userId) throws DatabaseException {
595 Query query = new Query(Type.SELECT, "USER_OPENIDS");
596 query.addField(new Field("USER_OPENIDS.*"));
597 query.addWhereClause(new ValueFieldWhereClause(new ValueField("USER_OPENIDS.USER", new StringParameter(userId))));
598 return database.getMultiple(query, new StringCreator("USER_OPENIDS.OPENID"));
606 * Loads the properties for the given object.
609 * The type of the object
613 * The table to load the properties from
615 * The type of the object (“ARTIST,” “TRACK,” etc.)
616 * @return The object with its properties loaded
617 * @throws DatabaseException
618 * if a database error occurs
620 private <T extends Base> T loadProperties(final T object, final String table, String type) throws DatabaseException {
621 Query query = new Query(Type.SELECT, table);
622 query.addField(new Field(table + ".PROPERTY"));
623 query.addField(new Field(table + ".VALUE"));
624 query.addWhereClause(new ValueFieldWhereClause(new ValueField(type, new StringParameter(object.getId()))));
625 database.process(query, new ResultProcessor() {
628 public void processResult(ResultSet resultSet) throws SQLException {
629 if (resultSet.isFirst()) {
630 object.getProperties().removeAll();
632 object.getProperties().set(resultSet.getString(table + ".PROPERTY"), resultSet.getString(table + ".VALUE"));
640 * {@link Artist} implementation that retrieves some attributes (such as
641 * {@link #getGroups()}, and {@link #getTracks()}) from the
642 * {@link DataManager} on demand.
644 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
646 private class LazyArtist extends DefaultArtist {
648 /** Memoizer for the tracks by this artist. */
649 private final Memoizer<Void> tracksMemoizer = new Memoizer<Void>(new Callable<Void>() {
652 public Void call() throws DatabaseException {
653 if (!hasValue("tracks")) {
654 getValue("tracks", Collection.class).set(getTracksByArtist(getId()));
660 /** Memoizer for the groups of this artist. */
661 private final Memoizer<Void> groupsMemoizer = new Memoizer<Void>(new Callable<Void>() {
664 public Void call() throws Exception {
665 if (!hasValue("groups")) {
666 getValue("groups", Collection.class).set(getGroupsByArtist(getId()));
674 * Creates a new lazy artist.
677 * The ID of the artist
679 public LazyArtist(String id) {
684 // DEFAULTARTIST METHODS
691 public Collection<Group> getGroups() {
692 groupsMemoizer.get();
693 return super.getGroups();
700 public Collection<Track> getTracks() {
701 tracksMemoizer.get();
702 return super.getTracks();
708 * {@link ObjectCreator} implementation that can create {@link Artist}
709 * objects. This specific class actually creates {@link LazyArtist}
712 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
714 private class ArtistCreator implements ObjectCreator<Artist> {
720 public Artist createObject(ResultSet resultSet) throws SQLException {
721 return new LazyArtist(resultSet.getString("ARTISTS.ID")).setName(resultSet.getString("ARTISTS.NAME"));
727 * {@link Group} implementation that retrieves some attributes (such as
728 * {@link #getArtists()}) from the {@link DataManager} on demand.
730 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
732 private class LazyGroup extends DefaultGroup {
734 /** Memoizer for the artist. */
735 private final Memoizer<Void> artistsMemoizer = new Memoizer<Void>(new Callable<Void>() {
738 public Void call() throws Exception {
739 if (!hasValue("artists")) {
740 getValue("artists", Collection.class).set(getArtistsByGroup(getId()));
748 * Creates a new lazy group.
751 * The ID of the group
753 public LazyGroup(String id) {
758 // DEFAULTGROUP METHODS
765 public Collection<Artist> getArtists() {
766 artistsMemoizer.get();
767 return super.getArtists();
773 * {@link ObjectCreator} implementation that can create {@link Group}
774 * objects. This specific implementation creates {@link LazyGroup}
777 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
779 private class GroupCreator implements ObjectCreator<Group> {
785 public Group createObject(ResultSet resultSet) throws SQLException {
786 return new LazyGroup(resultSet.getString("GROUPS.ID")).setName(resultSet.getString("GROUPS.NAME")).setUrl(resultSet.getString("GROUPS.URL"));
792 * {@link Track} implementation that retrieves some attributes (such as
793 * {@link #getArtists()}, and {@link #getStyles()}) from the
794 * {@link DataManager} on demand.
796 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
798 private class LazyTrack extends DefaultTrack {
800 /** Memoizer for the artists. */
801 private final Memoizer<Void> artistsMemoizer = new Memoizer<Void>(new Callable<Void>() {
804 public Void call() throws Exception {
805 if (!hasValue("artists")) {
806 getValue("artists", List.class).set(getArtistsByTrack(getId()));
813 /** Memoizer for the styles. */
814 private final Memoizer<Void> stylesMemoizer = new Memoizer<Void>(new Callable<Void>() {
817 public Void call() throws Exception {
818 if (!hasValue("styles")) {
819 getValue("styles", Collection.class).set(getStylesByTrack(getId()));
826 /** Memoizer for the remix artists. */
827 private final Memoizer<Void> remixArtistsMemoizer = new Memoizer<Void>(new Callable<Void>() {
830 public Void call() throws Exception {
831 if (!hasValue("remixArtists")) {
832 getValue("remixArtists", List.class).set(getRemixArtistsByTrack(getId()));
839 /** Memoizer for the track derivatives. */
840 private final Memoizer<Void> derivativesMemoizer = new Memoizer<Void>(new Callable<Void>() {
843 public Void call() throws Exception {
844 if (!hasValue("derivatives")) {
845 getValue("derivatives", Collection.class).set(getTrackDerivativesByTrack(getId()));
852 /** Memoizer for the related tracks. */
853 private final Memoizer<Void> relatedTracksMemoizer = new Memoizer<Void>(new Callable<Void>() {
856 public Void call() throws Exception {
857 if (!hasValue("relatedTracks")) {
858 getValue("relatedTracks", Map.class).set(getRelatedTracksByTrack(getId()));
866 * Creates a new track.
869 * The ID of the track
871 public LazyTrack(String id) {
876 // DEFAULTTRACK METHODS
883 public List<Artist> getArtists() {
884 artistsMemoizer.get();
885 return super.getArtists();
892 public Collection<Style> getStyles() {
893 stylesMemoizer.get();
894 return super.getStyles();
901 public List<Artist> getRemixArtists() {
902 remixArtistsMemoizer.get();
903 return super.getRemixArtists();
910 public Collection<TrackDerivative> getDerivatives() {
911 derivativesMemoizer.get();
912 return super.getDerivatives();
919 public Map<Relationship, Collection<Track>> getRelatedTracks() {
920 relatedTracksMemoizer.get();
921 return super.getRelatedTracks();
927 * {@link ObjectCreator} implementation that can create {@link Track}
928 * objects. This specific implementation creates {@link LazyTrack}
931 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
933 private class TrackCreator implements ObjectCreator<Track> {
939 public Track createObject(ResultSet resultSet) throws SQLException {
940 return new LazyTrack(resultSet.getString("TRACKS.ID")).setName(resultSet.getString("TRACKS.NAME")).setRemix(resultSet.getString("TRACKS.REMIX"));
946 * {@link ObjectCreator} implementation that can create
947 * {@link TrackDerivative} objects.
949 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
951 private class TrackDerivativeCreator implements ObjectCreator<TrackDerivative> {
957 public TrackDerivative createObject(ResultSet resultSet) throws SQLException {
958 return new DefaultTrackDerivative(resultSet.getString("TRACK_DERIVATIVES.ID"));
964 * {@link ObjectCreator} implementation that can create {@link Style}
967 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
969 private class StyleCreator implements ObjectCreator<Style> {
975 public Style createObject(ResultSet resultSet) throws SQLException {
976 return new DefaultStyle(resultSet.getString("STYLES.ID")).setName(resultSet.getString("STYLES.NAME"));
982 * {@link User} implementation that retrieves some attributes (such as
983 * {@link #getOpenIds()}) from the {@link DataManager} on demand.
985 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
987 private class LazyUser extends DefaultUser {
989 /** Memoizer for a user’s OpenIDs. */
990 private final Memoizer<Void> openIdMemoizer = new Memoizer<Void>(new Callable<Void>() {
993 public Void call() throws Exception {
994 if (!hasValue("openIds")) {
995 getValue("openIds", Collection.class).set(getOpenIdsByUser(getId()));
1002 * Creates a new user.
1005 * The ID of the user
1007 public LazyUser(String id) {
1015 public Collection<String> getOpenIds() {
1016 openIdMemoizer.get();
1017 return super.getOpenIds();
1023 * {@link ObjectCreator} implementation that can create {@link User}
1024 * objects. This specific implementation creates {@link LazyUser} instances.
1026 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
1028 private class UserCreator implements ObjectCreator<User> {
1034 public User createObject(ResultSet resultSet) throws SQLException {
1035 return new LazyUser(resultSet.getString("USERS.ID")).setName(resultSet.getString("USERS.NAME")).setPasswordHash(resultSet.getString("USERS.PASSWORD")).setLevel(resultSet.getInt("USERS.LEVEL"));