Merge FileFormats dll into Game and reorganise namespaces.

OpenRA.Game/Primitives/Cache.cs

@@ -0,0 +1,53 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+namespace OpenRA.Primitives
+{
+	public class Cache<T, U> : IEnumerable<KeyValuePair<T, U>>
+	{
+		Dictionary<T, U> hax;
+		Func<T,U> loader;
+
+		public Cache(Func<T,U> loader, IEqualityComparer<T> c)
+		{
+			hax = new Dictionary<T, U>(c);
+			if (loader == null)
+				throw new ArgumentNullException();
+
+			this.loader = loader;
+		}
+
+		public Cache(Func<T, U> loader)
+			: this(loader, EqualityComparer<T>.Default) { }
+
+		public U this[T key]
+		{
+			get
+			{
+				U result;
+				if (!hax.TryGetValue(key, out result))
+					hax.Add(key, result = loader(key));
+
+				return result;
+			}
+		}
+
+		public IEnumerator<KeyValuePair<T, U>> GetEnumerator() { return hax.GetEnumerator(); }
+
+		IEnumerator IEnumerable.GetEnumerator() { return GetEnumerator(); }
+
+		public IEnumerable<T> Keys { get { return hax.Keys; } }
+		public IEnumerable<U> Values { get { return hax.Values; } }
+	}
+}