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();
54 private final Database database;
56 public DataManager(Database database) {
57 this.database = database;
60 public Collection<Artist> getAllArtists() throws DatabaseException {
61 Query query = new Query(Type.SELECT, "ARTISTS");
62 query.addField(new Field("ARTISTS.*"));
63 return database.getMultiple(query, artistCreator);
66 public Artist getArtistById(String id) throws DatabaseException {
67 Query query = new Query(Type.SELECT, "ARTISTS");
68 query.addField(new Field("ARTISTS.*"));
69 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(id))));
70 return database.getSingle(query, artistCreator);
73 public Collection<Artist> getArtistsByGroup(String groupId) throws DatabaseException {
74 Query query = new Query(Type.SELECT, "ARTISTS");
75 query.addField(new Field("ARTISTS.*"));
76 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("ARTISTS.ID"), new Field("GROUP_ARTISTS.ARTIST")));
77 query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.GROUP_", new StringParameter(groupId))));
78 return database.getMultiple(query, artistCreator);
81 public Track trackById(String id) throws DatabaseException {
82 Query query = new Query(Type.SELECT, "TRACKS");
83 query.addField(new Field("TRACKS.*"));
84 query.addField(new Field("TRACK_ARTISTS.*"));
85 query.addField(new Field("ARTISTS.*"));
86 query.addField(new Field("TRACK_STYLES.*"));
87 query.addField(new Field("STYLES.*"));
88 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
89 query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
90 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
91 query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
92 query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACKS.ID", new StringParameter(id))));
93 query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
94 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
95 TrackLoader trackLoader = new TrackLoader();
96 database.process(query, trackLoader);
97 return trackLoader.get();
100 public Collection<Track> getTracksByArtist(String artistId) throws DatabaseException {
101 Query query = new Query(Type.SELECT, "TRACKS");
102 query.addField(new Field("TRACKS.*"));
103 query.addField(new Field("TRACK_ARTISTS.*"));
104 query.addField(new Field("ARTISTS.*"));
105 query.addField(new Field("TRACK_STYLES.*"));
106 query.addField(new Field("STYLES.*"));
107 query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
108 query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
109 query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
110 query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
111 query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(artistId))));
112 query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
113 query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
114 TrackLoader trackLoader = new TrackLoader();
115 database.process(query, trackLoader);
116 return trackLoader.all();
119 public Collection<Group> getGroupsByArtist(String artistId) throws DatabaseException {
120 Query query = new Query(Type.SELECT, "GROUPS");
121 query.addField(new Field("GROUPS.*"));
122 query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("GROUPS.ID"), new Field("GROUP_ARTISTS.GROUP_")));
123 query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.ARTIST", new StringParameter(artistId))));
124 return database.getMultiple(query, groupCreator);
127 private class TrackLoader implements ResultProcessor {
129 private final List<Track> loadedTracks = new ArrayList<Track>();
133 return loadedTracks.isEmpty() ? null : loadedTracks.get(0);
136 public List<Track> all() {
143 public void processResult(ResultSet resultSet) throws SQLException {
144 String trackId = resultSet.getString("TRACKS.ID");
145 if ((track == null) || (!track.id().equals(trackId))) {
146 track = new DefaultTrack(trackId).name(resultSet.getString("TRACKS.NAME")).artists(new ArrayList<Artist>()).styles(new HashSet<Style>());
147 loadedTracks.add(track);
149 Artist artist = new LazyArtist(resultSet.getString("ARTISTS.ID")).name(resultSet.getString("ARTISTS.NAME"));
150 if (!track.artists().contains(artist)) {
151 track.artists().add(artist);
153 Style style = new DefaultStyle(resultSet.getString("STYLES.ID")).name(resultSet.getString("STYLES.NAME"));
154 track.styles().add(style);
159 private class ArtistLoader implements ResultProcessor {
161 private final List<Artist> artists = new ArrayList<Artist>();
162 private Artist artist;
164 public Artist get() {
165 return artists.isEmpty() ? null : artists.get(0);
168 public List<Artist> all() {
173 // RESULTPROCESSOR METHODS
179 public void processResult(ResultSet resultSet) throws SQLException {
180 String artistId = resultSet.getString("ARTISTS.ID");
181 if ((artist == null) || (!artist.id().equals(artistId))) {
182 artist = new LazyArtist(artistId).name(resultSet.getString("ARTISTS.NAME")).groups(new HashSet<Group>());
186 Group group = new DefaultGroup(resultSet.getString("GROUPS.ID")).name(resultSet.getString("GROUPS.NAME")).url(resultSet.getString("GROUPS.URL"));
187 artist.groups().add(group);
192 private class LazyArtist extends DefaultArtist {
194 private final Memoizer<Void> tracksMemoizer = new Memoizer<Void>(new Callable<Void>() {
195 public Void call() throws DatabaseException {
196 if (!hasValue("tracks")) {
197 value("tracks", Collection.class).set(getTracksByArtist(id()));
203 private final Memoizer<Void> groupsMemoizer = new Memoizer<Void>(new Callable<Void>() {
206 public Void call() throws Exception {
207 if (!hasValue("groups")) {
208 value("groups", Collection.class).set(getGroupsByArtist(id()));
215 public LazyArtist(String id) {
223 public Collection<Group> groups() {
224 groupsMemoizer.get();
225 return super.groups();
228 public Collection<Track> tracks() {
229 tracksMemoizer.get();
230 return super.tracks();
235 private class ArtistCreator implements ObjectCreator<Artist> {
241 public Artist createObject(ResultSet resultSet) throws SQLException {
242 return new LazyArtist(resultSet.getString("ARTISTS.ID")).name(resultSet.getString("ARTISTS.NAME"));
247 private class LazyGroup extends DefaultGroup {
249 private final Memoizer<Void> artistsMemoizer = new Memoizer<Void>(new Callable<Void>() {
252 public Void call() throws Exception {
253 if (!hasValue("artists")) {
254 value("artists", Collection.class).set(getArtistsByGroup(id()));
261 public LazyGroup(String id) {
269 public Collection<Artist> artists() {
270 artistsMemoizer.get();
271 return super.artists();
276 private class GroupCreator implements ObjectCreator<Group> {
282 public Group createObject(ResultSet resultSet) throws SQLException {
283 return new LazyGroup(resultSet.getString("GROUPS.ID")).name(resultSet.getString("GROUPS.NAME")).url(resultSet.getString("GROUPS.URL"));