</example>
  </function>

  <function>
    <description>
      Check if a file exists.
    </description>
    <name>fileExists</name>
    <function-class>org.codelibs.fess.taglib.FessFunctions</function-class>
    <function-signature>boolean fileExists(java.lang.String)</function-signature>
    <example>
      ${fe:fileExists(path)}
    </example>
  </function>

  <function>

        if (value == null) {
            return StringUtil.EMPTY;
        }
        return Base64.getUrlEncoder().encodeToString(value.getBytes(Constants.CHARSET_UTF_8));
    }

    public static boolean fileExists(final String path) {
        final File file = new File(LaServletContextUtil.getServletContext().getRealPath(path));
        return file.exists();
    }

    public static String url(final String input) {