refactoring-ornek-1-adim-1.java

public List<Trip> getTripsByUser(User user) throws UserNotLoggedInException {
    User loggedUser = UserSession.getInstance().getLoggedUser();

    if(loggedUser == null){
        throw new UserNotLoggedInException();
    }
    
    List<Trip> tripList = new ArrayList<Trip>();
    boolean isFriend = false;

    for (User friend : user.getFriends()) {
        if (friend.equals(loggedUser)) {
            isFriend = true;
            break;
        }
    }
    
    if (isFriend) {
        tripList = TripDAO.findTripsByUser(user);
    }
    
    return tripList;
}