From: David ‘Bombe’ Roden <bombe@pterodactylus.net>
Date: Thu, 19 Apr 2012 14:01:02 +0000 (+0200)
Subject: Add artist implementation that lazily loads referenced objects.
X-Git-Url: https://git.pterodactylus.net/?a=commitdiff_plain;h=ccdb2ab4b84f960ec67561227692f6e694a7f260;hp=9dc33f50de736f6d98c988c555ed4b14cd47c423;p=demoscenemusic.git

Add artist implementation that lazily loads referenced objects.
---

diff --git a/src/main/java/net/pterodactylus/demoscenemusic/data/DataManager.java b/src/main/java/net/pterodactylus/demoscenemusic/data/DataManager.java
index e6d58bf..5183226 100644
--- a/src/main/java/net/pterodactylus/demoscenemusic/data/DataManager.java
+++ b/src/main/java/net/pterodactylus/demoscenemusic/data/DataManager.java
@@ -23,7 +23,9 @@ 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;
@@ -181,4 +183,26 @@ public class DataManager {
 
 	}
 
+	private class LazyArtist extends DefaultArtist {
+
+		private final Memoizer<Void> tracks = new Memoizer<Void>(new Callable<Void>() {
+			public Void call() throws DatabaseException {
+				if (!hasValue("tracks")) {
+					value("tracks", Collection.class).set(getTracksByArtist(id()));
+				}
+				return null;
+			}
+		});
+
+		public LazyArtist(String id) {
+			super(id);
+		}
+
+		public Collection<Track> tracks() {
+			tracks.get();
+			return value("tracks", Collection.class).get();
+		}
+
+	}
+
 }