code: private boolean hasTemplate(String href) {
      if (href == null) {
        return false;
      }
      return URI_TEMPLATE_PATTERN.matcher(href).find();
    }
docs: Determine whether the argument href contains at least one URI template, as defined in RFC 6570.
  
  @param href Href to check.
  @return True if the href contains a template, false if not (or if the argument is null).