}

            @Override
            public Integer getUserCodeMaxLengthAsInteger() {
                return 20;
            }

            @Override
            public String getUserCodePattern() {
                return "[a-zA-Z0-9_]+";
            }
        };

        assertTrue(fessConfig.isValidUserCode("1234567890"));
        assertTrue(fessConfig.isValidUserCode("12345678901234567890"));

    default boolean isApiAdminAccessAllowed(final Set<String> accessPermissions) {
        return getApiAdminAccessPermissionSet().stream().anyMatch(s -> accessPermissions.contains(s));
    }

    String getUserCodePattern();

    Integer getUserCodeMinLengthAsInteger();

    Integer getUserCodeMaxLengthAsInteger();

    default boolean isValidUserCode(final String userCode) {
        if (userCode == null) {

     * The value is, e.g. [a-zA-Z0-9_]+ <br>
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getUserCodePattern();

    /**
     * Get the value for the key 'mail.from.name'. <br>
     * The value is, e.g. Administrator <br>
     * comment: From