code: public static String getFillerRuleDefinitionFileName(final String rootDir, final DatabaseType databaseType) {
          return Joiner.on('/').join(rootDir, databaseType.name().toLowerCase(), FILLER_DEFINITION_FILE_NAME);
      }
docs: Get extractor rule definition file name.
  
  @param rootDir root dir
  @param databaseType database type
  @return extractor rule definition file name