public void init() {
        if (logger.isDebugEnabled()) {
            logger.debug("Initializing {}", this.getClass().getSimpleName());
        }
        stream(ComponentUtil.getFessConfig().getSearchDefaultPermissionsAsArray()).of(stream -> stream.forEach(name -> {
            defaultRoleList.add(name);
        }));
    }

    /**
     * Builds a set of roles from the request.

    }

    // Mock classes

    static class MockFessConfig extends FessConfig.SimpleImpl {
        @Override
        public String[] getSearchDefaultPermissionsAsArray() {
            return new String[] { "guest", "default" };
        }

        @Override
        public List<String> getSearchGuestRoleList() {
            List<String> roles = new ArrayList<>();