/* 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/. */
using Db4objects.Db4o.Internal;
using Db4objects.Db4o.Internal.Weakref;

namespace Db4objects.Db4o.Internal.Weakref
{
	public class WeakReferenceSupportFactory
	{
		public static IWeakReferenceSupport ForObjectContainer(ObjectContainerBase container
			)
		{
			if (!Platform4.HasWeakReferences())
			{
				return DisabledWeakReferenceSupport();
			}
			if (!container.ConfigImpl.WeakReferences())
			{
				return DisabledWeakReferenceSupport();
			}
			return new EnabledWeakReferenceSupport(container);
		}

		public static IWeakReferenceSupport DisabledWeakReferenceSupport()
		{
			return new _IWeakReferenceSupport_22();
		}

		private sealed class _IWeakReferenceSupport_22 : IWeakReferenceSupport
		{
			public _IWeakReferenceSupport_22()
			{
			}

			public void Stop()
			{
			}

			public void Start()
			{
			}

			public void Purge()
			{
			}

			public object NewWeakReference(ObjectReference referent, object obj)
			{
				return obj;
			}
		}
	}
}
