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

Copyright (C) 2004 - 2011  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 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 void Stop()
            {
            }

            public void Start()
            {
            }

            public void Purge()
            {
            }

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