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=7e74ea99c1c8ab15f29b0fb091c070845025a97e;hpb=442daa4c3aafcc8398ab52e7e475f3c28c5e7caa;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 7e74ea9..374bb6c 100644
--- a/src/main/java/net/pterodactylus/demoscenemusic/data/DataManager.java
+++ b/src/main/java/net/pterodactylus/demoscenemusic/data/DataManager.java
@@ -31,6 +31,7 @@ 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;
@@ -47,6 +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) {
@@ -56,14 +60,7 @@ public class DataManager {
 	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 database.getMultiple(query, artistCreator);
 	}
 
 	public Artist getArtistById(String id) throws DatabaseException {
@@ -80,6 +77,14 @@ public class DataManager {
 		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 {
 		Query query = new Query(Type.SELECT, "TRACKS");
 		query.addField(new Field("TRACKS.*"));
@@ -234,4 +239,57 @@ public class DataManager {
 
 	}
 
+	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"));
+		}
+
+	}
+
 }