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.List;
24 import java.util.concurrent.Callable;
26 import net.pterodactylus.util.collection.Memoizer;
27 import net.pterodactylus.util.database.Database;
28 import net.pterodactylus.util.database.DatabaseException;
29 import net.pterodactylus.util.database.Field;
30 import net.pterodactylus.util.database.Join;
31 import net.pterodactylus.util.database.Join.JoinType;
32 import net.pterodactylus.util.database.ObjectCreator;
33 import net.pterodactylus.util.database.OrderField;
34 import net.pterodactylus.util.database.Parameter.StringParameter;
35 import net.pterodactylus.util.database.Query;
36 import net.pterodactylus.util.database.Query.Type;
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 ObjectCreator<Artist> artistCreator = new ArtistCreator();
48 private final ObjectCreator<Group> groupCreator = new GroupCreator();
49 private final ObjectCreator<Track> trackCreator = new TrackCreator();
50 private final ObjectCreator<Style> styleCreator = new StyleCreator();
52 private final Database database;
54 public DataManager(Database database) {
55 this.database = database;
58 public Collection<Artist> getAllArtists() throws DatabaseException {
59 Query query = new Query(Type.SELECT, "ARTISTS");
60 query.addField(new Field("ARTISTS.*"));
61 return database.getMultiple(query, artistCreator);
64 public Artist getArtistById(String id) throws DatabaseException {
65 Query query = new Query(Type.SELECT, "ARTISTS");
66 query.addField(new Field("ARTISTS.*"));
67 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(id))));
68 return database.getSingle(query, artistCreator);
71 public Collection<Artist> getArtistsByGroup(String groupId) throws DatabaseException {
72 Query query = new Query(Type.SELECT, "ARTISTS");
73 query.addField(new Field("ARTISTS.*"));
74 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("ARTISTS.ID"), new Field("GROUP_ARTISTS.ARTIST")));
75 query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.GROUP_", new StringParameter(groupId))));
76 return database.getMultiple(query, artistCreator);
79 public List<Artist> getArtistsByTrack(String trackId) throws DatabaseException {
80 Query query = new Query(Type.SELECT, "ARTISTS");
81 query.addField(new Field("ARTISTS.*"));
82 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
83 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_ARTISTS.TRACK", new StringParameter(trackId))));
84 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER")));
85 return database.getMultiple(query, artistCreator);
88 public Track getTrackById(String id) throws DatabaseException {
89 Query query = new Query(Type.SELECT, "TRACKS");
90 query.addField(new Field("TRACKS.*"));
91 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACKS.ID", new StringParameter(id))));
92 return database.getSingle(query, trackCreator);
95 public Collection<Track> getTracksByArtist(String artistId) throws DatabaseException {
96 Query query = new Query(Type.SELECT, "TRACKS");
97 query.addField(new Field("TRACKS.*"));
98 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
99 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_ARTISTS.ARTIST", new StringParameter(artistId))));
100 return database.getMultiple(query, trackCreator);
103 public Collection<Group> getGroupsByArtist(String artistId) throws DatabaseException {
104 Query query = new Query(Type.SELECT, "GROUPS");
105 query.addField(new Field("GROUPS.*"));
106 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("GROUPS.ID"), new Field("GROUP_ARTISTS.GROUP_")));
107 query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.ARTIST", new StringParameter(artistId))));
108 return database.getMultiple(query, groupCreator);
111 public Collection<Style> getStylesByTrack(String trackId) throws DatabaseException {
112 Query query = new Query(Type.SELECT, "STYLES");
113 query.addField(new Field("STYLES.*"));
114 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("STYLES.ID"), new Field("TRACK_STYLES.STYLE")));
115 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_STYLES.TRACK", new StringParameter(trackId))));
116 return database.getMultiple(query, styleCreator);
119 private class LazyArtist extends DefaultArtist {
121 private final Memoizer<Void> tracksMemoizer = new Memoizer<Void>(new Callable<Void>() {
123 public Void call() throws DatabaseException {
124 if (!hasValue("tracks")) {
125 getValue("tracks", Collection.class).set(getTracksByArtist(getId()));
131 private final Memoizer<Void> groupsMemoizer = new Memoizer<Void>(new Callable<Void>() {
134 public Void call() throws Exception {
135 if (!hasValue("groups")) {
136 getValue("groups", Collection.class).set(getGroupsByArtist(getId()));
143 public LazyArtist(String id) {
151 public Collection<Group> getGroups() {
152 groupsMemoizer.get();
153 return super.getGroups();
157 public Collection<Track> getTracks() {
158 tracksMemoizer.get();
159 return super.getTracks();
164 private class ArtistCreator implements ObjectCreator<Artist> {
170 public Artist createObject(ResultSet resultSet) throws SQLException {
171 return new LazyArtist(resultSet.getString("ARTISTS.ID")).setName(resultSet.getString("ARTISTS.NAME"));
176 private class LazyGroup extends DefaultGroup {
178 private final Memoizer<Void> artistsMemoizer = new Memoizer<Void>(new Callable<Void>() {
181 public Void call() throws Exception {
182 if (!hasValue("artists")) {
183 getValue("artists", Collection.class).set(getArtistsByGroup(getId()));
190 public LazyGroup(String id) {
198 public Collection<Artist> getArtists() {
199 artistsMemoizer.get();
200 return super.getArtists();
205 private class GroupCreator implements ObjectCreator<Group> {
211 public Group createObject(ResultSet resultSet) throws SQLException {
212 return new LazyGroup(resultSet.getString("GROUPS.ID")).setName(resultSet.getString("GROUPS.NAME")).setUrl(resultSet.getString("GROUPS.URL"));
217 private class LazyTrack extends DefaultTrack {
219 private final Memoizer<Void> artistsMemoizer = new Memoizer<Void>(new Callable<Void>() {
222 public Void call() throws Exception {
223 if (!hasValue("artists")) {
224 getValue("artists", List.class).set(getArtistsByTrack(getId()));
231 private final Memoizer<Void> stylesMemoizer = new Memoizer<Void>(new Callable<Void>() {
234 public Void call() throws Exception {
235 if (!hasValue("styles")) {
236 getValue("styles", Collection.class).set(getStylesByTrack(getId()));
246 public LazyTrack(String id) {
254 public List<Artist> getArtists() {
255 artistsMemoizer.get();
256 return super.getArtists();
263 public Collection<Style> getStyles() {
264 stylesMemoizer.get();
265 return super.getStyles();
270 private class TrackCreator implements ObjectCreator<Track> {
276 public Track createObject(ResultSet resultSet) throws SQLException {
277 return new LazyTrack(resultSet.getString("TRACKS.ID")).setName(resultSet.getString("TRACKS.NAME"));
282 private class StyleCreator implements ObjectCreator<Style> {
288 public Style createObject(ResultSet resultSet) throws SQLException {
289 return new DefaultStyle(resultSet.getString("STYLES.ID")).setName(resultSet.getString("STYLES.NAME"));