code: private static MethodSpec indexFormatters(
        String methodName, String registerMethodName, Map<LocaleID, ClassName> dateClasses) {
      
      MethodSpec.Builder method = MethodSpec.methodBuilder(methodName)
          .addModifiers(PRIVATE, STATIC);
      
      for (Map.Entry<LocaleID, ClassName> entry : dateClasses.entrySet()) {
        LocaleID localeId = entry.getKey();
        ClassName className = entry.getValue();
        method.addStatement("$T.$L(Locale.$L, $L.class)", CLDR_BASE, 
            registerMethodName, localeId.safe, className);
      }
      return method.build();
    }
docs: Generates a static code block that populates the formatter map.