public class NullSystemDiscoveryService : IEhrSystemDiscoveryService
    {
        private IUserAuthenticatorFactory _userAuthenticatorFactory;
        public NullSystemDiscoveryService(IUserAuthenticatorFactory userAuthenticatorFactory)
        {
            _userAuthenticatorFactory = userAuthenticatorFactory;
        }
        public bool CanSearch
        {
            get { return false; }
        }

        public void Probe(CancellationToken token, Action<IEnumerable<EHRServerInfo>> onEndpointDiscovered)
        {
        }

        public void Select(EHRServerInfo info)
        {
        }

        public bool InitializationRequired
        {
            get { return false; }
        }

        public IUserAuthenticator CreateUserAuthenticator()
        {
            return _userAuthenticatorFactory.Create();
        }

        public IEhrInitializationService CreateInitializationService()
        {
            return null;
        }
    }