code: public static File getH2DataFile(Settings configuration) throws IOException {
          final File dir = configuration.getH2DataDirectory();
          final String fileName = configuration.getString(Settings.KEYS.DB_FILE_NAME);
          final File file = new File(dir, fileName);
          return file;
      }
docs: Returns a reference to the H2 database file.
  
  @param configuration the configured settings
  @return the path to the H2 database file
  @throws IOException thrown if there is an error