Add first stab at database interface.

diff --git a/src/main/java/net/pterodactylus/demoscenemusic/data/DataManager.java b/src/main/java/net/pterodactylus/demoscenemusic/data/DataManager.java
new file mode 100644 (file)
index 0000000..56d5cea
--- /dev/null
+++ b/src/main/java/net/pterodactylus/demoscenemusic/data/DataManager.java
@@ -0,0 +1,122 @@
+/*
+ * DemosceneMusic - DataManager.java - Copyright © 2012 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.demoscenemusic.data;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+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.Parameter.StringParameter;
+import net.pterodactylus.util.database.Query;
+import net.pterodactylus.util.database.Query.Type;
+import net.pterodactylus.util.database.ValueField;
+import net.pterodactylus.util.database.ValueFieldWhereClause;
+
+/**
+ * TODO
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class DataManager {
+
+       private final Database database;
+
+       private final TrackLoader trackLoader = new TrackLoader();
+
+       private final ArtistLoader artistLoader = new ArtistLoader();
+
+       private final StyleLoader styleLoader = new StyleLoader();
+
+       public DataManager(Database database) {
+               this.database = database;
+       }
+
+       public Track trackById(String id) throws DatabaseException {
+               Query query = new Query(Type.SELECT, "TRACKS");
+               query.addField(new Field("TRACKS.*"));
+               query.addField(new Field("ARTISTS.*"));
+               query.addField(new Field("STYLES.*"));
+               query.addJoin(new Join(JoinType.INNER, "ARTISTS", new Field("TRACKS.ARTIST"), new Field("ARTISTS.ID")));
+               query.addJoin(new Join(JoinType.INNER, "STYLES", new Field("TRACKS.STYLE"), new Field("STYLES.ID")));
+               query.addWhereClause(new ValueFieldWhereClause(new ValueField("ID", new StringParameter(id))));
+               return database.getSingle(query, trackLoader);
+       }
+
+       private class TrackLoader implements ObjectCreator<Track> {
+
+               /**
+                * {@inheritDoc}
+                */
+               public Track createObject(ResultSet resultSet) throws SQLException {
+                       return new AbstractTrack(resultSet.getString("TRACKS.ID")) {
+
+                               public void save() {
+                                       if (!dirty()) {
+                                               return;
+                                       }
+                               }
+
+                       }.name(resultSet.getString("TRACKS.NAME")).style(styleLoader.createObject(resultSet)).artist(artistLoader.createObject(resultSet));
+               }
+
+       }
+
+       private class ArtistLoader implements ObjectCreator<Artist> {
+
+               /**
+                * {@inheritDoc}
+                */
+               public Artist createObject(ResultSet resultSet) throws SQLException {
+                       return new AbstractArtist(resultSet.getString("ARTISTS.ID")) {
+
+                               public void save() {
+                                       if (!dirty()) {
+                                               return;
+                                       }
+                               }
+
+                       }.name(resultSet.getString("ARTISTS.NAME"));
+               }
+
+       }
+
+       private class StyleLoader implements ObjectCreator<Style> {
+
+               /**
+                * {@inheritDoc}
+                */
+               public Style createObject(ResultSet resultSet) throws SQLException {
+                       return new AbstractStyle(resultSet.getString("STYLES.ID")) {
+
+                               public void save() {
+                                       if (!dirty()) {
+                                               return;
+                                       }
+                               }
+
+                       }.name(resultSet.getString("STYLES.NAME"));
+               }
+
+       }
+
+}