From 6c850a66c258f3b59e62bd60c794137625bbc82a Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Wed, 18 Apr 2012 06:31:46 +0200
Subject: [PATCH] Add attributes to base class.

---
 .../demoscenemusic/data/AbstractBase.java          | 39 ++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/src/main/java/net/pterodactylus/demoscenemusic/data/AbstractBase.java b/src/main/java/net/pterodactylus/demoscenemusic/data/AbstractBase.java
index 2f7f3c7..4a35db1 100644
--- a/src/main/java/net/pterodactylus/demoscenemusic/data/AbstractBase.java
+++ b/src/main/java/net/pterodactylus/demoscenemusic/data/AbstractBase.java
@@ -17,6 +17,9 @@
 
 package net.pterodactylus.demoscenemusic.data;
 
+import java.util.HashMap;
+import java.util.Map;
+
 /**
  * TODO
  *
@@ -26,6 +29,8 @@ public class AbstractBase {
 
 	private final String id;
 
+	private final Map<String, Value<?>> attributes = new HashMap<String, Value<?>>();
+
 	protected AbstractBase(String id) {
 		this.id = id;
 	}
@@ -34,4 +39,38 @@ public class AbstractBase {
 		return id;
 	}
 
+	@SuppressWarnings({ "synthetic-access", "unchecked" })
+	protected <T> Value<T> value(String name, Class<T> clazz) {
+		if (!attributes.containsKey(name)) {
+			attributes.put(name, new Value<T>());
+		}
+		return (Value<T>) attributes.get(name);
+	}
+
+	protected static class Value<T> {
+
+		private T original;
+
+		private T current;
+
+		public T get() {
+			return current;
+		}
+
+		public Value<T> set(T value) {
+			current = value;
+			return this;
+		}
+
+		public boolean dirty() {
+			return (original != null) ? !original.equals(current) : current != null;
+		}
+
+		public Value<T> commit() {
+			original = current;
+			return this;
+		}
+
+	}
+
 }
-- 
2.7.4