private final ObjectCreator<Artist> artistCreator = new ArtistCreator();
private final ObjectCreator<Group> groupCreator = new GroupCreator();
private final ObjectCreator<Track> trackCreator = new TrackCreator();
+ private final ObjectCreator<Style> styleCreator = new StyleCreator();
private final Database database;
return database.getMultiple(query, artistCreator);
}
- public Track trackById(String id) throws DatabaseException {
+ 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 database.getMultiple(query, artistCreator);
+ }
+
+ public Track getTrackById(String id) throws DatabaseException {
Query query = new Query(Type.SELECT, "TRACKS");
query.addField(new Field("TRACKS.*"));
query.addWhereClause(new ValueFieldWhereClause(new ValueField("TRACKS.ID", new StringParameter(id))));
return database.getMultiple(query, groupCreator);
}
+ 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);
+ }
+
private class LazyArtist extends DefaultArtist {
private final Memoizer<Void> tracksMemoizer = new Memoizer<Void>(new Callable<Void>() {
});
+ private final Memoizer<Void> stylesMemoizer = new Memoizer<Void>(new Callable<Void>() {
+
+ @Override
+ public Void call() throws Exception {
+ if (!hasValue("styles")) {
+ value("styles", Collection.class).set(getStylesByTrack(id()));
+ }
+ return null;
+ }
+
+ });
+
/**
* @param id
*/
*/
@Override
public Collection<Style> styles() {
- // TODO Auto-generated method stub
+ stylesMemoizer.get();
return super.styles();
}
}
+ private class StyleCreator implements ObjectCreator<Style> {
+
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public Style createObject(ResultSet resultSet) throws SQLException {
+ return new DefaultStyle(resultSet.getString("STYLES.ID")).name(resultSet.getString("STYLES.NAME"));
+ }
+
+ }
+
}