import java.sql.ResultSet;
import java.sql.SQLException;
-import java.util.ArrayList;
import java.util.Collection;
+import java.util.EnumMap;
+import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.Callable;
+import net.pterodactylus.demoscenemusic.data.Track.Relationship;
+import net.pterodactylus.util.collection.Memoizer;
import net.pterodactylus.util.database.Database;
import net.pterodactylus.util.database.DatabaseException;
import net.pterodactylus.util.database.Field;
import net.pterodactylus.util.database.Join;
import net.pterodactylus.util.database.Join.JoinType;
+import net.pterodactylus.util.database.ObjectCreator;
+import net.pterodactylus.util.database.ObjectCreator.StringCreator;
+import net.pterodactylus.util.database.OrWhereClause;
import net.pterodactylus.util.database.OrderField;
-import net.pterodactylus.util.database.OrderField.Order;
+import net.pterodactylus.util.database.Parameter.IntegerParameter;
import net.pterodactylus.util.database.Parameter.StringParameter;
import net.pterodactylus.util.database.Query;
import net.pterodactylus.util.database.Query.Type;
import net.pterodactylus.util.database.ValueFieldWhereClause;
/**
- * TODO
+ * Interface between the database and the application.
*
* @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
*/
public class DataManager {
+ /** The artist object creator. */
+ @SuppressWarnings("synthetic-access")
+ private final ObjectCreator<Artist> artistCreator = new ArtistCreator();
+
+ /** The group object creator. */
+ @SuppressWarnings("synthetic-access")
+ private final ObjectCreator<Group> groupCreator = new GroupCreator();
+
+ /** The track object creator. */
+ @SuppressWarnings("synthetic-access")
+ private final ObjectCreator<Track> trackCreator = new TrackCreator();
+
+ /** The track object creator. */
+ @SuppressWarnings("synthetic-access")
+ private final ObjectCreator<TrackDerivative> trackDerivativeCreator = new TrackDerivativeCreator();
+
+ /** The style object creator. */
+ @SuppressWarnings("synthetic-access")
+ private final ObjectCreator<Style> styleCreator = new StyleCreator();
+
+ /** The party object creator. */
+ @SuppressWarnings("synthetic-access")
+ private final ObjectCreator<Party> partyCreator = new PartyCreator();
+
+ /** The {@link User} object creator. */
+ @SuppressWarnings("synthetic-access")
+ private final ObjectCreator<User> userCreator = new UserCreator();
+
+ /** The database. */
private final Database database;
+ /**
+ * Creates a new data manager.
+ *
+ * @param database
+ * The database to operate on
+ */
public DataManager(Database database) {
this.database = database;
}
+ /**
+ * Returns all artists.
+ *
+ * @return All artists
+ * @throws DatabaseException
+ * if a database error occurs
+ */
public Collection<Artist> getAllArtists() throws DatabaseException {
Query query = new Query(Type.SELECT, "ARTISTS");
query.addField(new Field("ARTISTS.*"));
- query.addField(new Field("GROUP_ARTISTS.*"));
- query.addField(new Field("GROUPS.*"));
- query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("ARTISTS.ID"), new Field("GROUP_ARTISTS.ARTIST")));
- query.addJoin(new Join(JoinType.INNER, "GROUPS", new Field("GROUP_ARTISTS.GROUP_"), new Field("GROUPS.ID")));
- query.addOrderField(new OrderField(new Field("ARTISTS.ID")));
- ArtistLoader artistLoader = new ArtistLoader();
- database.process(query, artistLoader);
- return artistLoader.all();
+ return loadArtistProperties(database.getMultiple(query, artistCreator));
}
+ /**
+ * Returns the artist with the given ID.
+ *
+ * @param id
+ * The ID of the artist
+ * @return The artist with the given ID, or {@code null} if there is no
+ * artist with the given ID
+ * @throws DatabaseException
+ * if a database error occurs
+ */
public Artist getArtistById(String id) throws DatabaseException {
Query query = new Query(Type.SELECT, "ARTISTS");
query.addField(new Field("ARTISTS.*"));
- query.addField(new Field("GROUP_ARTISTS.*"));
- query.addField(new Field("GROUPS.*"));
- query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("ARTISTS.ID"), new Field("GROUP_ARTISTS.ARTIST")));
- query.addJoin(new Join(JoinType.INNER, "GROUPS", new Field("GROUP_ARTISTS.GROUP_"), new Field("GROUPS.ID")));
query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(id))));
- query.addOrderField(new OrderField(new Field("ARTISTS.ID")));
- ArtistLoader artistLoader = new ArtistLoader();
- database.process(query, artistLoader);
- return artistLoader.get();
+ return loadArtistProperties(database.getSingle(query, artistCreator));
+ }
+
+ /**
+ * Returns all artists that belong to the group with the given ID.
+ *
+ * @param groupId
+ * The ID of the group
+ * @return All artists belonging to the given group
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Collection<Artist> getArtistsByGroup(String groupId) throws DatabaseException {
+ Query query = new Query(Type.SELECT, "ARTISTS");
+ query.addField(new Field("ARTISTS.*"));
+ query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("ARTISTS.ID"), new Field("GROUP_ARTISTS.ARTIST")));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.GROUP_", new StringParameter(groupId))));
+ return loadArtistProperties(database.getMultiple(query, artistCreator));
+ }
+
+ /**
+ * Returns all artists involved in the track with the given ID.
+ *
+ * @param trackId
+ * The ID of the track
+ * @return All artists involved in the track, in preferred order
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public List<Artist> getArtistsByTrack(String trackId) throws DatabaseException {
+ Query query = new Query(Type.SELECT, "ARTISTS");
+ query.addField(new Field("ARTISTS.*"));
+ query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_ARTISTS.TRACK", new StringParameter(trackId))));
+ query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER")));
+ return loadArtistProperties(database.getMultiple(query, artistCreator));
}
- public Track trackById(String id) throws DatabaseException {
+ /**
+ * Creates a new artist with the given name.
+ *
+ * @param name
+ * The name of the artist
+ * @return The created artist
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Artist createArtist(String name) throws DatabaseException {
+ Query query = new Query(Type.INSERT, "ARTISTS");
+ String id = UUID.randomUUID().toString();
+ query.addValueField(new ValueField("ID", new StringParameter(id)));
+ query.addValueField(new ValueField("NAME", new StringParameter(name)));
+ database.insert(query);
+ return loadArtistProperties(getArtistById(id));
+ }
+
+ /**
+ * Saves the given artist.
+ *
+ * @param artist
+ * The artist to save
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public void saveArtist(Artist artist) throws DatabaseException {
+ Query query = new Query(Type.UPDATE, "ARTISTS");
+ query.addValueField(new ValueField("NAME", new StringParameter(artist.getName())));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("ID", new StringParameter(artist.getId()))));
+ database.update(query);
+
+ /* save groups. */
+ Collection<Group> groups = artist.getGroups();
+ query = new Query(Type.DELETE, "GROUP_ARTISTS");
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.ARTIST", new StringParameter(artist.getId()))));
+ database.update(query);
+ for (Group group : groups) {
+ query = new Query(Type.INSERT, "GROUP_ARTISTS");
+ query.addValueField(new ValueField("GROUP_", new StringParameter(group.getId())));
+ query.addValueField(new ValueField("ARTIST", new StringParameter(artist.getId())));
+ database.insert(query);
+ }
+
+ /* save properties. */
+ saveArtistProperties(artist);
+ }
+
+ /**
+ * Saves the properties of the given artist.
+ *
+ * @param artist
+ * The artist whose properties to save
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public void saveArtistProperties(Artist artist) throws DatabaseException {
+ saveProperties(artist.getProperties(), "ARTIST_PROPERTIES", "ARTIST", artist.getId());
+ }
+
+ /**
+ * Saves the given properties to the given table for the given principal.
+ *
+ * @param properties
+ * The properties to save
+ * @param table
+ * The table in which to save the properties
+ * @param type
+ * The type of the principal (e. g. “ARTIST” or “TRACK”)
+ * @param id
+ * The ID of the principial
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public void saveProperties(Properties properties, String table, String type, String id) throws DatabaseException {
+ if (!properties.isDirty()) {
+ return;
+ }
+ Query query = new Query(Type.DELETE, table);
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField(type, new StringParameter(id))));
+ database.update(query);
+ for (Entry<String, String> property : properties) {
+ Query insertQuery = new Query(Type.INSERT, table);
+ insertQuery.addValueField(new ValueField(type, new StringParameter(id)));
+ insertQuery.addValueField(new ValueField("PROPERTY", new StringParameter(property.getKey())));
+ insertQuery.addValueField(new ValueField("VALUE", new StringParameter(property.getValue())));
+ database.insert(insertQuery);
+ }
+ properties.resetDirty();
+ }
+
+ /**
+ * Loads the properties for an artist.
+ *
+ * @param artist
+ * The artist to load the properties for
+ * @return The artist
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Artist loadArtistProperties(final Artist artist) throws DatabaseException {
+ return loadProperties(artist, "ARTIST_PROPERTIES", "ARTIST");
+ }
+
+ /**
+ * Loads the properties of all given artists.
+ *
+ * @param artists
+ * The artists to load the properties for
+ * @return The list of artists
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public List<Artist> loadArtistProperties(List<Artist> artists) throws DatabaseException {
+ return loadProperties(artists, "ARTIST_PROPERTIES", "ARTIST");
+ }
+
+ /**
+ * Returns all remix artists involved in the track with the given ID.
+ *
+ * @param trackId
+ * The ID of the track
+ * @return All remix artists involved in the track, in preferred order
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public List<Artist> getRemixArtistsByTrack(String trackId) throws DatabaseException {
+ Query query = new Query(Type.SELECT, "ARTISTS");
+ query.addField(new Field("ARTISTS.*"));
+ query.addJoin(new Join(JoinType.INNER, "TRACK_REMIX_ARTISTS", new Field("TRACK_REMIX_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_REMIX_ARTISTS.TRACK", new StringParameter(trackId))));
+ query.addOrderField(new OrderField(new Field("TRACK_REMIX_ARTISTS.DISPLAY_ORDER")));
+ return database.getMultiple(query, artistCreator);
+ }
+
+ /**
+ * Returns all related tracks for the track with the given ID.
+ *
+ * @param trackId
+ * The ID of the tracks
+ * @return A mapping from relationship to all tracks that match the relation
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Map<Relationship, Collection<Track>> getRelatedTracksByTrack(String trackId) throws DatabaseException {
+ Query query = new Query(Type.SELECT, "TRACKS");
+ query.addField(new Field("TRACKS.*"));
+ query.addField(new Field("TRACK_RELATIONS.*"));
+ query.addJoin(new Join(JoinType.INNER, "TRACK_RELATIONS", new Field("TRACK_RELATIONS.TRACK"), new Field("TRACK_RELATIONS.RELATED_TRACK")));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_RELATIONS.TRACK", new StringParameter(trackId))));
+ final Map<Relationship, Collection<Track>> relatedTracks = new EnumMap<Relationship, Collection<Track>>(Relationship.class);
+ database.process(query, new ResultProcessor() {
+
+ @Override
+ @SuppressWarnings("synthetic-access")
+ public void processResult(ResultSet resultSet) throws SQLException {
+ Track track = trackCreator.createObject(resultSet);
+ Relationship relationship = Relationship.valueOf(resultSet.getString("TRACK_RELATIONS.RELATIONSHIP"));
+ if (!relatedTracks.containsKey(relationship)) {
+ relatedTracks.put(relationship, new HashSet<Track>());
+ }
+ relatedTracks.get(relationship).add(track);
+ }
+ });
+ return relatedTracks;
+ }
+
+ /**
+ * Returns the track with the given ID.
+ *
+ * @param id
+ * The ID of the track
+ * @return The track with the given ID, or {@code null} if there is no such
+ * track
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Track getTrackById(String id) throws DatabaseException {
Query query = new Query(Type.SELECT, "TRACKS");
query.addField(new Field("TRACKS.*"));
- query.addField(new Field("TRACK_ARTISTS.*"));
- query.addField(new Field("ARTISTS.*"));
- query.addField(new Field("TRACK_STYLES.*"));
- query.addField(new Field("STYLES.*"));
- query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
- query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
- query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
- query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACKS.ID", new StringParameter(id))));
- query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
- query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
- TrackLoader trackLoader = new TrackLoader();
- database.process(query, trackLoader);
- return trackLoader.get();
+ return loadTrackProperties(database.getSingle(query, trackCreator));
+ }
+
+ /**
+ * Returns the track that contains the derivative with the given ID.
+ *
+ * @param id
+ * The ID of the track derivative
+ * @return The track the derivative belongs to, or {@code null} if there is
+ * no such track
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Track getTrackByDerivativeId(String id) throws DatabaseException {
+ Query query = new Query(Type.SELECT, "TRACKS");
+ query.addField(new Field("TRACKS.*"));
+ query.addJoin(new Join(JoinType.INNER, "TRACK_DERIVATIVES", new Field("TRACK_DERIVATIVES.TRACK"), new Field("TRACKS.ID")));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_DERIVATIVES.ID", new StringParameter(id))));
+ return loadTrackProperties(database.getSingle(query, trackCreator));
}
+ /**
+ * Returns all tracks by the artist with the given ID.
+ *
+ * @param artistId
+ * The ID of the artist
+ * @return All tracks by the given artist
+ * @throws DatabaseException
+ * if a database error occurs
+ */
public Collection<Track> getTracksByArtist(String artistId) throws DatabaseException {
Query query = new Query(Type.SELECT, "TRACKS");
query.addField(new Field("TRACKS.*"));
- query.addField(new Field("TRACK_ARTISTS.*"));
- query.addField(new Field("ARTISTS.*"));
- query.addField(new Field("TRACK_STYLES.*"));
- query.addField(new Field("STYLES.*"));
query.addJoin(new Join(JoinType.INNER, "TRACK_ARTISTS", new Field("TRACKS.ID"), new Field("TRACK_ARTISTS.TRACK")));
- query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACK_ARTISTS.ARTIST"), new Field("ARTISTS.ID")));
- query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("TRACKS.ID"), new Field("TRACK_STYLES.TRACK")));
- query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACK_STYLES.STYLE"), new Field("STYLES.ID")));
- query.addWhereClause(new ValueFieldWhereClause(new ValueField("ARTISTS.ID", new StringParameter(artistId))));
- query.addOrderField(new OrderField(new Field("TRACKS.ID"), Order.ASCENDING));
- query.addOrderField(new OrderField(new Field("TRACK_ARTISTS.DISPLAY_ORDER"), Order.ASCENDING));
- TrackLoader trackLoader = new TrackLoader();
- database.process(query, trackLoader);
- return trackLoader.all();
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_ARTISTS.ARTIST", new StringParameter(artistId))));
+ return loadTrackProperties(database.getMultiple(query, trackCreator));
+ }
+
+ /**
+ * Returns all tracks that were released at the party with the given ID.
+ *
+ * @param partyId
+ * The ID of the party
+ * @return All tracks that were released at the given party
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Collection<Track> getTracksByParty(String partyId) throws DatabaseException {
+ Query query = new Query(Type.SELECT, "TRACKS");
+ query.addField(new Field("TRACKS.*"));
+ query.addJoin(new Join(JoinType.INNER, "PARTY_TRACKS", new Field("PARTY_TRACKS.TRACK"), new Field("TRACKS.ID")));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("PARTY_TRACKS.PARTY", new StringParameter(partyId))));
+ return loadTrackProperties(database.getMultiple(query, trackCreator));
+ }
+
+ /**
+ * Loads the properties for the given track.
+ *
+ * @param track
+ * The track for which to load the properties
+ * @return The track with the properties loaded
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Track loadTrackProperties(Track track) throws DatabaseException {
+ return loadProperties(track, "TRACK_PROPERTIES", "TRACK");
+ }
+
+ /**
+ * Loads the properties for the given tracks.
+ *
+ * @param tracks
+ * The tracks for which to load the properties
+ * @return The tracks with the properties loaded
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public List<Track> loadTrackProperties(List<Track> tracks) throws DatabaseException {
+ return loadProperties(tracks, "TRACK_PROPERTIES", "TRACK");
+ }
+
+ /**
+ * Creates a new track with the given name.
+ *
+ * @param name
+ * The name of the track
+ * @return The created track
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Track createTrack(String name) throws DatabaseException {
+ Query query = new Query(Type.INSERT, "TRACKS");
+ String id = UUID.randomUUID().toString();
+ query.addValueField(new ValueField("ID", new StringParameter(id)));
+ query.addValueField(new ValueField("NAME", new StringParameter(name)));
+ database.insert(query);
+ return getTrackById(id);
+ }
+
+ /**
+ * Saves the given track. This also saves all relationships of the track.
+ *
+ * @param track
+ * The track to save
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public void saveTrack(Track track) throws DatabaseException {
+ Query query = new Query(Type.UPDATE, "TRACKS");
+ query.addValueField(new ValueField("TRACKS.NAME", new StringParameter(track.getName())));
+ query.addValueField(new ValueField("TRACKS.REMIX", new StringParameter(track.getRemix())));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACKS.ID", new StringParameter(track.getId()))));
+ database.update(query);
+ /* store artist information. */
+ track.getArtists(); /* prefetch artists. */
+ query = new Query(Type.DELETE, "TRACK_ARTISTS");
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_ARTISTS.TRACK", new StringParameter(track.getId()))));
+ database.update(query);
+ for (int index = 0; index < track.getArtists().size(); ++index) {
+ query = new Query(Type.INSERT, "TRACK_ARTISTS");
+ query.addValueField(new ValueField("TRACK_ARTISTS.TRACK", new StringParameter(track.getId())));
+ query.addValueField(new ValueField("TRACK_ARTISTS.ARTIST", new StringParameter(track.getArtists().get(index).getId())));
+ query.addValueField(new ValueField("TRACK_ARTISTS.DISPLAY_ORDER", new IntegerParameter(index + 1)));
+ database.insert(query);
+ }
+
+ /* store party links. */
+ Collection<Party> parties = track.getParties(); /* prefetch parties. */
+ query = new Query(Type.DELETE, "PARTY_TRACKS");
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("PARTY_TRACKS.TRACK", new StringParameter(track.getId()))));
+ database.update(query);
+ for (Party party : parties) {
+ query = new Query(Type.INSERT, "PARTY_TRACKS");
+ query.addValueField(new ValueField("PARTY_TRACKS.TRACK", new StringParameter(track.getId())));
+ query.addValueField(new ValueField("PARTY_TRACKS.PARTY", new StringParameter(party.getId())));
+ database.insert(query);
+ }
+
+ /* store properties. */
+ saveProperties(track.getProperties(), "TRACK_PROPERTIES", "TRACK", track.getId());
+ }
+
+ /**
+ * Returns the derivative with the given ID.
+ *
+ * @param id
+ * The ID of the derivatives to load
+ * @return The derivative with the given ID
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public TrackDerivative getTrackDerivativeById(String id) throws DatabaseException {
+ Query query = new Query(Type.SELECT, "TRACK_DERIVATIVES");
+ query.addField(new Field("TRACK_DERIVATIVES.*"));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_DERIVATIVES.ID", new StringParameter(id))));
+ return loadTrackDerivativeProperties(database.getSingle(query, trackDerivativeCreator));
+ }
+
+ /**
+ * Returns the derivatives for the given track.
+ *
+ * @param trackId
+ * The track ID to get the derivatives for
+ * @return The derivatives for the given track
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Collection<TrackDerivative> getTrackDerivativesByTrack(String trackId) throws DatabaseException {
+ Query query = new Query(Type.SELECT, "TRACK_DERIVATIVES");
+ query.addField(new Field("TRACK_DERIVATIVES.*"));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_DERIVATIVES.TRACK", new StringParameter(trackId))));
+ return loadTrackDerivativeProperties(database.getMultiple(query, trackDerivativeCreator));
+ }
+
+ /**
+ * Creates a new derivative for the given track.
+ *
+ * @param track
+ * The track to create the derivative for
+ * @return The created derivative
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public TrackDerivative createTrackDerivative(Track track) throws DatabaseException {
+ Query query = new Query(Type.INSERT, "TRACK_DERIVATIVES");
+ String id = UUID.randomUUID().toString();
+ query.addValueField(new ValueField("TRACK_DERIVATIVES.ID", new StringParameter(id)));
+ query.addValueField(new ValueField("TRACK_DERIVATIVES.TRACK", new StringParameter(track.getId())));
+ database.insert(query);
+ return getTrackDerivativeById(id);
+ }
+
+ /**
+ * Loads the properties for the given track derivative.
+ *
+ * @param trackDerivative
+ * The track derivative to load the properties for
+ * @return The track derivative with its properties loaded
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public TrackDerivative loadTrackDerivativeProperties(TrackDerivative trackDerivative) throws DatabaseException {
+ return loadProperties(trackDerivative, "TRACK_DERIVATIVE_PROPERTIES", "TRACK_DERIVATIVE");
+ }
+
+ /**
+ * Loads the properties for the given track derivatives.
+ *
+ * @param trackDerivatives
+ * The track derivatives to load the properties for
+ * @return The track derivatives with their properties loaded
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public List<TrackDerivative> loadTrackDerivativeProperties(List<TrackDerivative> trackDerivatives) throws DatabaseException {
+ return loadProperties(trackDerivatives, "TRACK_DERIVATIVE_PROPERTIES", "TRACK_DERIVATIVE");
+ }
+
+ /**
+ * Saves the given track derivative. As a track derivative does not have any
+ * attributes of its own only its properties are saved.
+ *
+ * @param trackDerivative
+ * The track derivative to save
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public void saveTrackDerivate(TrackDerivative trackDerivative) throws DatabaseException {
+ saveProperties(trackDerivative.getProperties(), "TRACK_DERIVATIVE_PROPERTIES", "TRACK_DERIVATIVE", trackDerivative.getId());
+ }
+
+ /**
+ * Removes the given track derivative and all its properties from the
+ * database.
+ *
+ * @param trackDerivative
+ * The track derivative to remove
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public void removeTrackDerivative(TrackDerivative trackDerivative) throws DatabaseException {
+ Query query = new Query(Type.DELETE, "TRACK_DERIVATIVES");
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_DERIVATIVES.ID", new StringParameter(trackDerivative.getId()))));
+ database.update(query);
+ /* remove the properties. */
+ saveProperties(new Properties().set("dirty", "true").removeAll(), "TRACK_DERIVATIVE_PROPERTIES", "TRACK_DERIVATIVE", trackDerivative.getId());
+ }
+
+ /**
+ * Returns all groups.
+ *
+ * @return All groups
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Collection<Group> getAllGroups() throws DatabaseException {
+ Query query = new Query(Type.SELECT, "GROUPS");
+ query.addField(new Field("GROUPS.*"));
+ return loadGroupProperties(database.getMultiple(query, groupCreator));
+ }
+
+ /**
+ * Returns the group with the given ID.
+ *
+ * @param groupId
+ * The ID of the group
+ * @return The group with the given ID, or {@code null} if no such group
+ * exists
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Group getGroupById(String groupId) throws DatabaseException {
+ Query query = new Query(Type.SELECT, "GROUPS");
+ query.addField(new Field("GROUPS.*"));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUPS.ID", new StringParameter(groupId))));
+ return loadGroupProperties(database.getSingle(query, groupCreator));
+ }
+
+ /**
+ * Returns all groups the artist with the given ID belongs to.
+ *
+ * @param artistId
+ * The ID of the artist
+ * @return All groups the artist belongs to
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Collection<Group> getGroupsByArtist(String artistId) throws DatabaseException {
+ Query query = new Query(Type.SELECT, "GROUPS");
+ query.addField(new Field("GROUPS.*"));
+ query.addJoin(new Join(JoinType.INNER, "GROUP_ARTISTS", new Field("GROUPS.ID"), new Field("GROUP_ARTISTS.GROUP_")));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("GROUP_ARTISTS.ARTIST", new StringParameter(artistId))));
+ return database.getMultiple(query, groupCreator);
+ }
+
+ /**
+ * Loads the properties of the given group.
+ *
+ * @param group
+ * The group to load the properties for
+ * @return The group with its properties loaded
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Group loadGroupProperties(Group group) throws DatabaseException {
+ return loadProperties(group, "GROUP_PROPERTIES", "GROUP_ID");
+ }
+
+ /**
+ * Loads the properties of the given groups.
+ *
+ * @param groups
+ * The groups to load the properties for
+ * @return The groups with their properties loaded
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Collection<Group> loadGroupProperties(List<Group> groups) throws DatabaseException {
+ return loadProperties(groups, "GROUP_PROPERTIES", "GROUP_ID");
+ }
+
+ /**
+ * Creates a group with the given name.
+ *
+ * @param name
+ * The name of the new group
+ * @return The new group
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Group createGroup(String name) throws DatabaseException {
+ Query query = new Query(Type.INSERT, "GROUPS");
+ String id = UUID.randomUUID().toString();
+ query.addValueField(new ValueField("ID", new StringParameter(id)));
+ query.addValueField(new ValueField("NAME", new StringParameter(name)));
+ database.insert(query);
+ return getGroupById(id);
+ }
+
+ /**
+ * Saves the given group.
+ *
+ * @param group
+ * The group to save
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public void saveGroup(Group group) throws DatabaseException {
+ Query query = new Query(Type.UPDATE, "GROUPS");
+ query.addValueField(new ValueField("NAME", new StringParameter(group.getName())));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("ID", new StringParameter(group.getId()))));
+ database.update(query);
+ /* save properties. */
+ saveGroupProperties(group);
+ }
+
+ /**
+ * Saves the properties of the given group.
+ *
+ * @param group
+ * The group whose properties to save
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public void saveGroupProperties(Group group) throws DatabaseException {
+ saveProperties(group.getProperties(), "GROUP_PROPERTIES", "GROUP_ID", group.getId());
+ }
+
+ /**
+ * Returns all styles for the track with the given ID.
+ *
+ * @param trackId
+ * The ID of the track
+ * @return All styles for the given track
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Collection<Style> getStylesByTrack(String trackId) throws DatabaseException {
+ Query query = new Query(Type.SELECT, "STYLES");
+ query.addField(new Field("STYLES.*"));
+ query.addJoin(new Join(JoinType.INNER, "TRACK_STYLES", new Field("STYLES.ID"), new Field("TRACK_STYLES.STYLE")));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACK_STYLES.TRACK", new StringParameter(trackId))));
+ return database.getMultiple(query, styleCreator);
+ }
+
+ /**
+ * Returns all parties.
+ *
+ * @return All parties
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Collection<Party> getAllParties() throws DatabaseException {
+ Query query = new Query(Type.SELECT, "PARTIES");
+ query.addField(new Field("PARTIES.*"));
+ return loadPartyProperties(database.getMultiple(query, partyCreator));
+ }
+
+ /**
+ * Returns all parties that the track with the given ID was released at.
+ *
+ * @param trackId
+ * The ID of the track
+ * @return All parties the track was released at
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Collection<Party> getPartiesByTrackId(String trackId) throws DatabaseException {
+ Query query = new Query(Type.SELECT, "PARTIES");
+ query.addField(new Field("PARTIES.*"));
+ query.addJoin(new Join(JoinType.INNER, "PARTY_TRACKS", new Field("PARTY_TRACKS.PARTY"), new Field("PARTIES.ID")));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("PARTY_TRACKS.TRACK", new StringParameter(trackId))));
+ return loadPartyProperties(database.getMultiple(query, partyCreator));
+ }
+
+ /**
+ * Returns the party with the given ID.
+ *
+ * @param partyId
+ * The ID of the party
+ * @return The party with the given ID
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Party getPartyById(String partyId) throws DatabaseException {
+ Query query = new Query(Type.SELECT, "PARTIES");
+ query.addField(new Field("PARTIES.*"));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("PARTIES.ID", new StringParameter(partyId))));
+ return loadPartyProperties(database.getSingle(query, partyCreator));
+ }
+
+ /**
+ * Loads the properties of the given party.
+ *
+ * @param party
+ * The party to load the properties for
+ * @return The party with its properties loaded
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Party loadPartyProperties(Party party) throws DatabaseException {
+ return loadProperties(party, "PARTY_PROPERTIES", "PARTY");
+ }
+
+ /**
+ * Loads the properties of the given parties.
+ *
+ * @param parties
+ * The parties to load the properties for
+ * @return The parties with their properties loaded
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public List<Party> loadPartyProperties(List<Party> parties) throws DatabaseException {
+ return loadProperties(parties, "PARTY_PROPERTIES", "PARTY");
+ }
+
+ /**
+ * Saves the given party.
+ *
+ * @param party
+ * The party to save
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public void saveParty(Party party) throws DatabaseException {
+ Query query = new Query(Type.UPDATE, "PARTIES");
+ query.addValueField(new ValueField("NAME", new StringParameter(party.getName())));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("ID", new StringParameter(party.getId()))));
+ database.update(query);
+ savePartyProperties(party);
+ }
+
+ /**
+ * Saves the properties of the given party.
+ *
+ * @param party
+ * The party whose properties to save
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public void savePartyProperties(Party party) throws DatabaseException {
+ saveProperties(party.getProperties(), "PARTY_PROPERTIES", "PARTY", party.getId());
+ }
+
+ /**
+ * Creates a new party with the given name.
+ *
+ * @param name
+ * The name of the party
+ * @return The new party
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Party createParty(String name) throws DatabaseException {
+ Query query = new Query(Type.INSERT, "PARTIES");
+ String id = UUID.randomUUID().toString();
+ query.addValueField(new ValueField("ID", new StringParameter(id)));
+ query.addValueField(new ValueField("NAME", new StringParameter(name)));
+ database.insert(query);
+ return getPartyById(id);
+ }
+
+ /**
+ * Returns the user with the given name.
+ *
+ * @param username
+ * The name of the user
+ * @return The user, or {@code null} if the user does not exist
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public User getUserByName(String username) throws DatabaseException {
+ Query query = new Query(Type.SELECT, "USERS");
+ query.addField(new Field("USERS.*"));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("USERS.NAME", new StringParameter(username))));
+ return database.getSingle(query, userCreator);
+ }
+
+ /**
+ * Returns the user connected with the given OpenID.
+ *
+ * @param openId
+ * The OpenID to find the user for
+ * @return The user connected with the given OpenID, or {@code null} if
+ * there is no such user
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public User getUserByOpenId(String openId) throws DatabaseException {
+ Query query = new Query(Type.SELECT, "USERS");
+ query.addField(new Field("USERS.*"));
+ query.addJoin(new Join(JoinType.INNER, "USER_OPENIDS", new Field("USER_OPENIDS.USER"), new Field("USERS.ID")));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("USER_OPENIDS.OPENID", new StringParameter(openId))));
+ return database.getSingle(query, userCreator);
+ }
+
+ /**
+ * Returns all OpenIDs connected with the user with the given ID.
+ *
+ * @param userId
+ * The ID of the user
+ * @return All OpenIDs connected with the given user
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ public Collection<String> getOpenIdsByUser(String userId) throws DatabaseException {
+ Query query = new Query(Type.SELECT, "USER_OPENIDS");
+ query.addField(new Field("USER_OPENIDS.*"));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField("USER_OPENIDS.USER", new StringParameter(userId))));
+ return database.getMultiple(query, new StringCreator("USER_OPENIDS.OPENID"));
+ }
+
+ //
+ // PRIVATE METHODS
+ //
+
+ /**
+ * Loads the properties for the given object.
+ *
+ * @param <T>
+ * The type of the object
+ * @param object
+ * The object
+ * @param table
+ * The table to load the properties from
+ * @param type
+ * The type of the object (“ARTIST,” “TRACK,” etc.)
+ * @return The object with its properties loaded
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ private <T extends Base> T loadProperties(final T object, final String table, String type) throws DatabaseException {
+ if (object == null) {
+ return null;
+ }
+ Query query = new Query(Type.SELECT, table);
+ query.addField(new Field(table + ".PROPERTY"));
+ query.addField(new Field(table + ".VALUE"));
+ query.addWhereClause(new ValueFieldWhereClause(new ValueField(type, new StringParameter(object.getId()))));
+ database.process(query, new ResultProcessor() {
+
+ @Override
+ public void processResult(ResultSet resultSet) throws SQLException {
+ if (resultSet.isFirst()) {
+ object.getProperties().removeAll();
+ }
+ object.getProperties().set(resultSet.getString(table + ".PROPERTY"), resultSet.getString(table + ".VALUE"));
+ }
+
+ });
+ return object;
+ }
+
+ /**
+ * Loads the properties for the given objects.
+ *
+ * @param <T>
+ * The type of the object
+ * @param objects
+ * The objects
+ * @param table
+ * The table to load the properties from
+ * @param type
+ * The type of the object (“ARTIST,” “TRACK,” etc.)
+ * @return The object with its properties loaded
+ * @throws DatabaseException
+ * if a database error occurs
+ */
+ private <T extends Base> List<T> loadProperties(List<T> objects, final String table, final String type) throws DatabaseException {
+ if (objects.isEmpty()) {
+ return objects;
+ }
+ final Map<String, T> objectMap = new HashMap<String, T>();
+ final Set<String> firstObjects = new HashSet<String>();
+ for (T object : objects) {
+ objectMap.put(object.getId(), object);
+ firstObjects.add(object.getId());
+ }
+ Query query = new Query(Type.SELECT, table);
+ query.addField(new Field(table + "." + type));
+ query.addField(new Field(table + ".PROPERTY"));
+ query.addField(new Field(table + ".VALUE"));
+ OrWhereClause whereClause = new OrWhereClause();
+ for (T object : objects) {
+ whereClause.add(new ValueFieldWhereClause(new ValueField(type, new StringParameter(object.getId()))));
+ }
+ query.addWhereClause(whereClause);
+ database.process(query, new ResultProcessor() {
+
+ @Override
+ public void processResult(ResultSet resultSet) throws SQLException {
+ String id = resultSet.getString(table + "." + type);
+ T object = objectMap.get(id);
+ if (firstObjects.remove(id)) {
+ object.getProperties().removeAll();
+ }
+ object.getProperties().set(resultSet.getString(table + ".PROPERTY"), resultSet.getString(table + ".VALUE"));
+ }
+
+ });
+ return objects;
+ }
+
+ /**
+ * {@link Artist} implementation that retrieves some attributes (such as
+ * {@link #getGroups()}, and {@link #getTracks()}) from the
+ * {@link DataManager} on demand.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+ private class LazyArtist extends DefaultArtist {
+
+ /** Memoizer for the tracks by this artist. */
+ private final Memoizer<Void> tracksMemoizer = new Memoizer<Void>(new Callable<Void>() {
+
+ @Override
+ public Void call() throws DatabaseException {
+ if (!hasValue("tracks")) {
+ getValue("tracks", Collection.class).set(getTracksByArtist(getId()));
+ }
+ return null;
+ }
+ });
+
+ /** Memoizer for the groups of this artist. */
+ private final Memoizer<Void> groupsMemoizer = new Memoizer<Void>(new Callable<Void>() {
+
+ @Override
+ public Void call() throws Exception {
+ if (!hasValue("groups")) {
+ getValue("groups", Collection.class).set(getGroupsByArtist(getId()));
+ }
+ return null;
+ }
+
+ });
+
+ /**
+ * Creates a new lazy artist.
+ *
+ * @param id
+ * The ID of the artist
+ */
+ public LazyArtist(String id) {
+ super(id);
+ }
+
+ //
+ // DEFAULTARTIST METHODS
+ //
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public Collection<Group> getGroups() {
+ groupsMemoizer.get();
+ return super.getGroups();
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public Collection<Track> getTracks() {
+ tracksMemoizer.get();
+ return super.getTracks();
+ }
+
}
- private class TrackLoader implements ResultProcessor {
+ /**
+ * {@link ObjectCreator} implementation that can create {@link Artist}
+ * objects. This specific class actually creates {@link LazyArtist}
+ * instances.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+ private class ArtistCreator implements ObjectCreator<Artist> {
- private final List<Track> loadedTracks = new ArrayList<Track>();
- private Track track;
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public Artist createObject(ResultSet resultSet) throws SQLException {
+ return new LazyArtist(resultSet.getString("ARTISTS.ID")).setName(resultSet.getString("ARTISTS.NAME"));
+ }
+
+ }
+
+ /**
+ * {@link Group} implementation that retrieves some attributes (such as
+ * {@link #getArtists()}) from the {@link DataManager} on demand.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+ private class LazyGroup extends DefaultGroup {
- public List<Track> all() {
- return loadedTracks;
+ /** Memoizer for the artist. */
+ private final Memoizer<Void> artistsMemoizer = new Memoizer<Void>(new Callable<Void>() {
+
+ @Override
+ public Void call() throws Exception {
+ if (!hasValue("artists")) {
+ getValue("artists", Collection.class).set(getArtistsByGroup(getId()));
+ }
+ return null;
+ }
+
+ });
+
+ /**
+ * Creates a new lazy group.
+ *
+ * @param id
+ * The ID of the group
+ */
+ public LazyGroup(String id) {
+ super(id);
}
+ //
+ // DEFAULTGROUP METHODS
+ //
+
/**
* {@inheritDoc}
*/
- public void processResult(ResultSet resultSet) throws SQLException {
- String trackId = resultSet.getString("TRACKS.ID");
- if ((track == null) || (!track.id().equals(trackId))) {
- track = new DefaultTrack(trackId).name(resultSet.getString("TRACKS.NAME")).artists(new ArrayList<Artist>()).styles(new HashSet<Style>());
- loadedTracks.add(track);
+ @Override
+ public Collection<Artist> getArtists() {
+ artistsMemoizer.get();
+ return super.getArtists();
+ }
+
+ }
+
+ /**
+ * {@link ObjectCreator} implementation that can create {@link Group}
+ * objects. This specific implementation creates {@link LazyGroup}
+ * instances.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+ private class GroupCreator implements ObjectCreator<Group> {
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public Group createObject(ResultSet resultSet) throws SQLException {
+ return new LazyGroup(resultSet.getString("GROUPS.ID")).setName(resultSet.getString("GROUPS.NAME"));
+ }
+
+ }
+
+ /**
+ * {@link Track} implementation that retrieves some attributes (such as
+ * {@link #getArtists()}, and {@link #getStyles()}) from the
+ * {@link DataManager} on demand.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+ private class LazyTrack extends DefaultTrack {
+
+ /** Memoizer for the artists. */
+ private final Memoizer<Void> artistsMemoizer = new Memoizer<Void>(new Callable<Void>() {
+
+ @Override
+ public Void call() throws Exception {
+ if (!hasValue("artists")) {
+ getValue("artists", List.class).set(getArtistsByTrack(getId()));
+ }
+ return null;
+ }
+
+ });
+
+ /** Memoizer for the styles. */
+ private final Memoizer<Void> stylesMemoizer = new Memoizer<Void>(new Callable<Void>() {
+
+ @Override
+ public Void call() throws Exception {
+ if (!hasValue("styles")) {
+ getValue("styles", Collection.class).set(getStylesByTrack(getId()));
+ }
+ return null;
+ }
+
+ });
+
+ /** Memoizer for the remix artists. */
+ private final Memoizer<Void> remixArtistsMemoizer = new Memoizer<Void>(new Callable<Void>() {
+
+ @Override
+ public Void call() throws Exception {
+ if (!hasValue("remixArtists")) {
+ getValue("remixArtists", List.class).set(getRemixArtistsByTrack(getId()));
+ }
+ return null;
+ }
+
+ });
+
+ /** Memoizer for the track derivatives. */
+ private final Memoizer<Void> derivativesMemoizer = new Memoizer<Void>(new Callable<Void>() {
+
+ @Override
+ public Void call() throws Exception {
+ if (!hasValue("derivatives")) {
+ getValue("derivatives", Collection.class).set(getTrackDerivativesByTrack(getId()));
+ }
+ return null;
+ }
+
+ });
+
+ /** Memoizer for the related tracks. */
+ private final Memoizer<Void> relatedTracksMemoizer = new Memoizer<Void>(new Callable<Void>() {
+
+ @Override
+ public Void call() throws Exception {
+ if (!hasValue("relatedTracks")) {
+ getValue("relatedTracks", Map.class).set(getRelatedTracksByTrack(getId()));
+ }
+ return null;
}
- Artist artist = new DefaultArtist(resultSet.getString("ARTISTS.ID")).name(resultSet.getString("ARTISTS.NAME"));
- if (!track.artists().contains(artist)) {
- track.artists().add(artist);
+
+ });
+
+ /**
+ * Creates a new track.
+ *
+ * @param id
+ * The ID of the track
+ */
+ public LazyTrack(String id) {
+ super(id);
+ }
+
+ //
+ // DEFAULTTRACK METHODS
+ //
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public List<Artist> getArtists() {
+ artistsMemoizer.get();
+ return super.getArtists();
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public Collection<Style> getStyles() {
+ stylesMemoizer.get();
+ return super.getStyles();
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public List<Artist> getRemixArtists() {
+ remixArtistsMemoizer.get();
+ return super.getRemixArtists();
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public Collection<TrackDerivative> getDerivatives() {
+ derivativesMemoizer.get();
+ return super.getDerivatives();
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public Map<Relationship, Collection<Track>> getRelatedTracks() {
+ relatedTracksMemoizer.get();
+ return super.getRelatedTracks();
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public Collection<Party> getParties() {
+ if (!hasValue("parties")) {
+ try {
+ getValue("parties", Collection.class).set(getPartiesByTrackId(getId()));
+ } catch (DatabaseException de1) {
+ throw new RuntimeException("Could not load Parties for Track " + getId() + ".", de1);
+ }
}
- Style style = new DefaultStyle(resultSet.getString("STYLES.ID")).name(resultSet.getString("STYLES.NAME"));
- track.styles().add(style);
+ return super.getParties();
}
- public Track get() {
- return loadedTracks.isEmpty() ? null : loadedTracks.get(0);
+ }
+
+ /**
+ * {@link ObjectCreator} implementation that can create {@link Track}
+ * objects. This specific implementation creates {@link LazyTrack}
+ * instances.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+ private class TrackCreator implements ObjectCreator<Track> {
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public Track createObject(ResultSet resultSet) throws SQLException {
+ return new LazyTrack(resultSet.getString("TRACKS.ID")).setName(resultSet.getString("TRACKS.NAME")).setRemix(resultSet.getString("TRACKS.REMIX"));
}
}
- private class ArtistLoader implements ResultProcessor {
+ /**
+ * {@link ObjectCreator} implementation that can create
+ * {@link TrackDerivative} objects.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+ private class TrackDerivativeCreator implements ObjectCreator<TrackDerivative> {
- private final List<Artist> artists = new ArrayList<Artist>();
- private Artist artist;
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public TrackDerivative createObject(ResultSet resultSet) throws SQLException {
+ return new DefaultTrackDerivative(resultSet.getString("TRACK_DERIVATIVES.ID"));
+ }
- public List<Artist> all() {
- return artists;
+ }
+
+ /**
+ * {@link ObjectCreator} implementation that can create {@link Style}
+ * objects.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+ private class StyleCreator implements ObjectCreator<Style> {
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public Style createObject(ResultSet resultSet) throws SQLException {
+ return new DefaultStyle(resultSet.getString("STYLES.ID")).setName(resultSet.getString("STYLES.NAME"));
+ }
+
+ }
+
+ /**
+ * {@link Party} implementation that loads additional information only on
+ * demand.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+ private class LazyParty extends DefaultParty {
+
+ /**
+ * Creates a new party.
+ *
+ * @param id
+ * The ID of the party
+ */
+ public LazyParty(String id) {
+ super(id);
}
//
- // RESULTPROCESSOR METHODS
+ // PARTY METHODS
//
/**
* {@inheritDoc}
*/
- public void processResult(ResultSet resultSet) throws SQLException {
- String artistId = resultSet.getString("ARTISTS.ID");
- if ((artist == null) || (!artist.id().equals(artistId))) {
- artist = new DefaultArtist(artistId).name(resultSet.getString("ARTISTS.NAME")).groups(new HashSet<Group>());
- artists.add(artist);
+ @Override
+ public Collection<Track> getReleases() {
+ if (!hasValue("releases")) {
+ try {
+ getValue("releases", Collection.class).set(getTracksByParty(getId()));
+ } catch (DatabaseException de1) {
+ throw new RuntimeException("Could not loaded Tracks for Party " + getId() + ".", de1);
+ }
+ }
+ return super.getReleases();
+ }
+
+ }
+
+ /**
+ * {@link ObjectCreator} implementation that can create {@link Party}
+ * objects.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+ private class PartyCreator implements ObjectCreator<Party> {
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public Party createObject(ResultSet resultSet) throws SQLException {
+ return new LazyParty(resultSet.getString("PARTIES.ID")).setName(resultSet.getString("PARTIES.NAME"));
+ }
+
+ }
+
+ /**
+ * {@link User} implementation that retrieves some attributes (such as
+ * {@link #getOpenIds()}) from the {@link DataManager} on demand.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+ private class LazyUser extends DefaultUser {
+
+ /** Memoizer for a user’s OpenIDs. */
+ private final Memoizer<Void> openIdMemoizer = new Memoizer<Void>(new Callable<Void>() {
+
+ @Override
+ public Void call() throws Exception {
+ if (!hasValue("openIds")) {
+ getValue("openIds", Collection.class).set(getOpenIdsByUser(getId()));
+ }
+ return null;
}
+ });
+
+ /**
+ * Creates a new user.
+ *
+ * @param id
+ * The ID of the user
+ */
+ public LazyUser(String id) {
+ super(id);
+ }
- Group group = new DefaultGroup(resultSet.getString("GROUPS.ID")).name(resultSet.getString("GROUPS.NAME")).url(resultSet.getString("GROUPS.URL"));
- artist.groups().add(group);
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public Collection<String> getOpenIds() {
+ openIdMemoizer.get();
+ return super.getOpenIds();
+ }
+
+ }
+
+ /**
+ * {@link ObjectCreator} implementation that can create {@link User}
+ * objects. This specific implementation creates {@link LazyUser} instances.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+ private class UserCreator implements ObjectCreator<User> {
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public User createObject(ResultSet resultSet) throws SQLException {
+ return new LazyUser(resultSet.getString("USERS.ID")).setName(resultSet.getString("USERS.NAME")).setPasswordHash(resultSet.getString("USERS.PASSWORD")).setLevel(resultSet.getInt("USERS.LEVEL"));
}
}
projects / demoscenemusic.git / blobdiff