Setup solution

ModernKeePassLib/Utility/TypeOverridePool.cs

@@ -0,0 +1,65 @@
+/*
+  KeePass Password Safe - The Open-Source Password Manager
+  Copyright (C) 2003-2019 Dominik Reichl <dominik.reichl@t-online.de>
+
+  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 2 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, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+using ModernKeePassLib.Delegates;
+
+namespace KeePassLib.Utility
+{
+	public static class TypeOverridePool
+	{
+		private static Dictionary<Type, GFunc<object>> g_d =
+			new Dictionary<Type, GFunc<object>>();
+
+		public static void Register(Type t, GFunc<object> f)
+		{
+			if(t == null) throw new ArgumentNullException("t");
+			if(f == null) throw new ArgumentNullException("f");
+
+			g_d[t] = f;
+		}
+
+		public static void Unregister(Type t)
+		{
+			if(t == null) throw new ArgumentNullException("t");
+
+			g_d.Remove(t);
+		}
+
+		public static bool IsRegistered(Type t)
+		{
+			if(t == null) throw new ArgumentNullException("t");
+
+			return g_d.ContainsKey(t);
+		}
+
+		public static T CreateInstance<T>()
+			where T : new()
+		{
+			GFunc<object> f;
+			if(g_d.TryGetValue(typeof(T), out f))
+				return (T)(f());
+
+			return new T();
+		}
+	}
+}