code: public String getBaseClassName() {
          CodeGeneratorLoggerFactory.getLogger().debug(
                  String.format("Reading base class name from data file [%s]", fileName));
          String baseClass = reader.getBaseClassName();
          if (baseClass == null) {
              String path = new File(fileName).getAbsolutePath();
              throw new IllegalArgumentException("Missing base class details in Data file :" + path);
          }
          return baseClass;
      }
docs: Return the base page class name from the PageYaml input
  
  @return A {@link String} representation of the base page class.