code: private void getSingleValue(Method method, Object object, Map<String, String> map)
     {
        Object value;
        try
        {
           value = filterValue(method.invoke(object));
        }
        catch (Exception ex)
        {
           value = ex.toString();
        }
  
        if (value != null)
        {
           map.put(getPropertyName(method), String.valueOf(value));
        }
     }
docs: Retrieve a single value property.
  
  @param method method definition
  @param object target object
  @param map parameter values