the shade of a tree

public static boolean sessionCheck() {
   FlexSession session = FlexContext.getFlexSession();
   if(session != null) {
      return true;
   } else {
      throw new NoSessionOnFlexException("no session object exist on this application.");
   }
}

public static void setSessionAttribute(String key, Object value) {
   if(sessionCheck()) {
      FlexContext.getFlexSession().setAttribute(key, value);
   }
}

public static Object getSessionAttribute(String key) {
   if(sessionCheck()) {
      return FlexContext.getFlexSession().getAttribute(key);
   }
   return null;
}