/* This file is part of the db4o object database http://www.db4o.com

Copyright (C) 2004 - 2010  Versant Corporation http://www.versant.com

db4o is free software; you can redistribute it and/or modify it under
the terms of version 3 of the GNU General Public License as published
by the Free Software Foundation.

db4o 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, see http://www.gnu.org/licenses/. */
namespace Db4oTool.Tests.Core
{
	public delegate void ContextVariableBlock();

	public class ContextVariable<T>
	{
		private T _value;

		public ContextVariable(T initialValue)
		{
			_value = initialValue;
		}

		public T Value
		{
			get { return _value; }
		}

		public void Using(T value, ContextVariableBlock block)
		{
			T oldValue = _value;
			_value = value;
			try
			{
				block();
			}
			finally
			{
				_value = oldValue;
			}
		}
	}
}
