code: public String findPlatformFor(String jdbcSubProtocol, String jdbcDriver)
      {
          String platform = (String)jdbcSubProtocolToPlatform.get(jdbcSubProtocol);
  
          if (platform == null)
          {
              platform = (String)jdbcDriverToPlatform.get(jdbcDriver);
          }
          return platform;
      }
docs: Derives the OJB platform to use for a database that is connected via a url using the specified
  subprotocol, and where the specified jdbc driver is used.
  
  @param jdbcSubProtocol The JDBC subprotocol used to connect to the database
  @param jdbcDriver      The JDBC driver used to connect to the database
  @return The platform identifier or <code>null</code> if no platform could be found