sharee.bike-App/TINKLib/Model/User/Account/AccountExtensions.cs

using System.Collections.Generic;
using TINK.Model.Connector.Filter;

namespace TINK.Model.User.Account
{
    public static class AccountExtensions
    {
        /// <summary> Gets information whether user is logged in or not from account object. </summary>
        /// <param name="account">Object to get information from.</param>
        /// <returns>True if user is logged in, false if not.</returns>
        public static bool GetIsLoggedIn(this IAccount account)
        {
            return !string.IsNullOrEmpty(account.Mail)
                && !string.IsNullOrEmpty(account.SessionCookie);
        }

        /// <summary> 
        /// Filters bike groups depending on whether user has access to all groups of bikes.
        /// Some user may be "TINK"- user only, some "Konrad" and some may be "TINK" and "Konrad" users.
        /// </summary>
        /// <param name="account">Account to filter with.</param>
        /// <param name="filter">Groups to filter.</param>
        /// <returns>Filtered bike groups.</returns>
        public static IEnumerable<string> DoFilter(
            this IAccount account, 
            IEnumerable<string> filter)
        {

            return GetIsLoggedIn(account) 
                ? GroupFilterFactory.Create(account.Group).DoFilter(filter) // Filter if user is logged in.
                : new NullGroupFilter().DoFilter(filter); // Do not filter if no user is logged in.
        }
    }
}