code: private boolean isNotBlank(String subject, String resource, String operation) {
          return StringUtils.isNotBlank(subject) && StringUtils.isNotBlank(resource) && StringUtils.isNotBlank(operation);
      }
docs: Checks if any of the given strings is blank
  
  @param subject The subject to validate
  @param resource The resource to validate
  @param operation The operation to validate
  
  @return True if all strings are not blank, false otherwise