}

            @Override
            public String getRoleSearchRolePrefix() {
                return "";
            }

            @Override
            public String getRoleSearchDeniedPrefix() {
                return "D";
            }
        });
        try {
            assertEquals("{role}guest", permissionHelper.decode("guest"));
        } finally {

            lower = lower.substring(denyPrefix.length());
            permission = permission.substring(denyPrefix.length());
            aclPrefix = ComponentUtil.getFessConfig().getRoleSearchDeniedPrefix();
        } else {
            aclPrefix = StringUtil.EMPTY;
        }
        if (StringUtil.isBlank(permission)) {
            return null;
        }
        if (lower.startsWith(userPrefix)) {

        final String roleField = fessConfig.getIndexFieldRole();
        roleSet.stream().forEach(name -> roleQuery.should(QueryBuilders.termQuery(roleField, name)));
        final String deniedPrefix = fessConfig.getRoleSearchDeniedPrefix();
        roleSet.stream().forEach(name -> roleQuery.mustNot(QueryBuilders.termQuery(roleField, deniedPrefix + name)));
        boolQuery.filter(roleQuery);
    }

    /**