﻿/*
  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 KeePassLib.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();
		}
	}
}
