/// <summary>
/// constructor takes the SAFIdentity as its parameter.
/// </summary>
/// <param name="sid">SAFIdentity object which contain the identity and appplication name information</param>
public SAFPrincipal(SAFIdentity sid)
{
//retrieve the authentication configuraiton from the configuraiton file
ConfigurationManager cm = (ConfigurationManager)ConfigurationSettings.GetConfig("Framework");
AuthenticationConfiguration ac = cm.AuthenticationConfig;
//set identity object and the SAFUser property
identity = sid;
safUser = ac.GetSAFUserName(sid.Name, sid.ApplicationName);
//set the application inforamtion of the SAFPrincipal
SetApplication(sid.ApplicationName);
}