wow, its like resource management!

git-svn-id: svn://svn.ijw.co.nz/svn/OpenRa@1063 993157c7-ee19-0410-b2c4-bb4e9862e678

OpenRa.Core/ResourceCache.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.IO;
+
+namespace OpenRa.Core
+{
+	static class ResourceCache
+	{
+		static Dictionary<string, IResource> items = new Dictionary<string, IResource>();
+
+		public static void Flush()
+		{
+			items.Clear();
+		}
+
+		public static IResource Get(string filename)
+		{
+			IResource r;
+			if (!items.TryGetValue(filename, out r))
+				items.Add(filename, r = Load(filename));
+			return r;
+		}
+
+		static IResource Load(string filename)
+		{
+			Converter<Stream, IResource> loader = 
+				ResourceLoader.GetLoader(Path.GetExtension(filename));
+
+			if (loader == null)
+				return null;
+
+			Stream s = FileSystem.GetItem(filename);
+
+			if (s == null)
+				return null;
+
+			return loader(s);
+		}
+	}
+}