code: public String getParameter(final String name)
     {
        List<String> values = parameters.get(name);
        if (values == null)
        {
           return null;
        }
  
        if (values.size() == 0)
        {
           return "";
        }
  
        return values.get(0);
     }
docs: Get the first value of given parameter name.
  
  @return The value of the parameter, null if the parameter does not exist, or "" if the parameter exists but has no
  values.