import org.omg.CosNaming.NamingContextExtPackage.AddressHelper; //导入依赖的package包/类
/** {@inheritDoc} */
public String to_url(String an_address, String a_name_string)
              throws InvalidAddress, InvalidName
{
  InputStream in = null;
  try
    {
      OutputStream _out = _request("to_url", true);
      AddressHelper.write(_out, an_address);
      StringNameHelper.write(_out, a_name_string);
      in = _invoke(_out);

      return URLStringHelper.read(in);
    }
  catch (ApplicationException ex)
    {
      in = ex.getInputStream();

      String id = ex.getId();
      if (id.equals(InvalidAddressHelper.id()))
        throw InvalidAddressHelper.read(in);
      else if (id.equals(InvalidNameHelper.id()))
        throw InvalidNameHelper.read(in);
      else
        throw new MARSHAL(id);
    }
  catch (RemarshalException _rm)
    {
      return to_url(an_address, a_name_string);
    }
  finally
    {
      _releaseReply(in);
    }
}