X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fnet%2Fpterodactylus%2Fdemoscenemusic%2Fdata%2FDataManager.java;h=374bb6cd97184710018e0245a27dea1f648088a5;hb=eb3a62a5014e129da19f70b90c2b089301e08050;hp=214d0c400b8fcd77cd7f84d33ea58533670556ac;hpb=6b67d7d90a31de11c5c1e622b269022112f4fe02;p=demoscenemusic.git

diff --git a/src/main/java/net/pterodactylus/demoscenemusic/data/DataManager.java b/src/main/java/net/pterodactylus/demoscenemusic/data/DataManager.java
index 214d0c4..374bb6c 100644
--- a/src/main/java/net/pterodactylus/demoscenemusic/data/DataManager.java
+++ b/src/main/java/net/pterodactylus/demoscenemusic/data/DataManager.java
@@ -23,12 +23,15 @@ import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashSet;
 import java.util.List;
+import java.util.concurrent.Callable;
 
+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.OrderField;
 import net.pterodactylus.util.database.OrderField.Order;
 import net.pterodactylus.util.database.Parameter.StringParameter;
@@ -45,6 +48,9 @@ import net.pterodactylus.util.database.ValueFieldWhereClause;
  */
 public class DataManager {
 
+	private final ObjectCreator<Artist> artistCreator = new ArtistCreator();
+	private final ObjectCreator<Group> groupCreator = new GroupCreator();
+
 	private final Database database;
 
 	public DataManager(Database database) {
@@ -54,14 +60,29 @@ public class DataManager {
 	public Collection<Artist> getAllArtists() throws DatabaseException {
 		Query query = new Query(Type.SELECT, "ARTISTS");
 		query.addField(new Field("ARTISTS.*"));
+		return database.getMultiple(query, artistCreator);
+	}
+
+	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.all();
+		return artistLoader.get();
+	}
+
+	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 database.getMultiple(query, artistCreator);
 	}
 
 	public Track trackById(String id) throws DatabaseException {
@@ -83,11 +104,46 @@ public class DataManager {
 		return trackLoader.get();
 	}
 
+	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();
+	}
+
+	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, DefaultGroup.CREATOR);
+	}
+
 	private class TrackLoader implements ResultProcessor {
 
 		private final List<Track> loadedTracks = new ArrayList<Track>();
 		private Track track;
 
+		public Track get() {
+			return loadedTracks.isEmpty() ? null : loadedTracks.get(0);
+		}
+
+		public List<Track> all() {
+			return loadedTracks;
+		}
+
 		/**
 		 * {@inheritDoc}
 		 */
@@ -97,7 +153,7 @@ public class DataManager {
 				track = new DefaultTrack(trackId).name(resultSet.getString("TRACKS.NAME")).artists(new ArrayList<Artist>()).styles(new HashSet<Style>());
 				loadedTracks.add(track);
 			}
-			Artist artist = new DefaultArtist(resultSet.getString("ARTISTS.ID")).name(resultSet.getString("ARTISTS.NAME"));
+			Artist artist = new LazyArtist(resultSet.getString("ARTISTS.ID")).name(resultSet.getString("ARTISTS.NAME"));
 			if (!track.artists().contains(artist)) {
 				track.artists().add(artist);
 			}
@@ -105,10 +161,6 @@ public class DataManager {
 			track.styles().add(style);
 		}
 
-		public Track get() {
-			return loadedTracks.isEmpty() ? null : loadedTracks.get(0);
-		}
-
 	}
 
 	private class ArtistLoader implements ResultProcessor {
@@ -116,6 +168,10 @@ public class DataManager {
 		private final List<Artist> artists = new ArrayList<Artist>();
 		private Artist artist;
 
+		public Artist get() {
+			return artists.isEmpty() ? null : artists.get(0);
+		}
+
 		public List<Artist> all() {
 			return artists;
 		}
@@ -130,7 +186,7 @@ public class DataManager {
 		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>());
+				artist = new LazyArtist(artistId).name(resultSet.getString("ARTISTS.NAME")).groups(new HashSet<Group>());
 				artists.add(artist);
 			}
 
@@ -140,4 +196,100 @@ public class DataManager {
 
 	}
 
+	private class LazyArtist extends DefaultArtist {
+
+		private final Memoizer<Void> tracksMemoizer = new Memoizer<Void>(new Callable<Void>() {
+			public Void call() throws DatabaseException {
+				if (!hasValue("tracks")) {
+					value("tracks", Collection.class).set(getTracksByArtist(id()));
+				}
+				return null;
+			}
+		});
+
+		private final Memoizer<Void> groupsMemoizer = new Memoizer<Void>(new Callable<Void>() {
+
+			@Override
+			public Void call() throws Exception {
+				if (!hasValue("groups")) {
+					value("groups", Collection.class).set(getGroupsByArtist(id()));
+				}
+				return null;
+			}
+
+		});
+
+		public LazyArtist(String id) {
+			super(id);
+		}
+
+		/**
+		 * {@inheritDoc}
+		 */
+		@Override
+		public Collection<Group> groups() {
+			groupsMemoizer.get();
+			return super.groups();
+		}
+
+		public Collection<Track> tracks() {
+			tracksMemoizer.get();
+			return super.tracks();
+		}
+
+	}
+
+	private class ArtistCreator implements ObjectCreator<Artist> {
+
+		/**
+		 * {@inheritDoc}
+		 */
+		@Override
+		public Artist createObject(ResultSet resultSet) throws SQLException {
+			return new LazyArtist(resultSet.getString("ARTISTS.ID")).name(resultSet.getString("ARTISTS.NAME"));
+		}
+
+	}
+
+	private class LazyGroup extends DefaultGroup {
+
+		private final Memoizer<Void> artistsMemoizer = new Memoizer<Void>(new Callable<Void>() {
+
+			@Override
+			public Void call() throws Exception {
+				if (!hasValue("artists")) {
+					value("artists", Collection.class).set(getArtistsByGroup(id()));
+				}
+				return null;
+			}
+
+		});
+
+		public LazyGroup(String id) {
+			super(id);
+		}
+
+		/**
+		 * {@inheritDoc}
+		 */
+		@Override
+		public Collection<Artist> artists() {
+			artistsMemoizer.get();
+			return super.artists();
+		}
+
+	}
+
+	private class GroupCreator implements ObjectCreator<Group> {
+
+		/**
+		 * {@inheritDoc}
+		 */
+		@Override
+		public Group createObject(ResultSet resultSet) throws SQLException {
+			return new LazyGroup(resultSet.getString("GROUPS.ID")).name(resultSet.getString("GROUPS.NAME")).url(resultSet.getString("GROUPS.URL"));
+		}
+
+	}
+
 }