private static final String LOGIN_METHOD = "login_method";

    private static final String LOGIN_URL = "login_url";

    private static final String LOGIN_PARAMETERS = "login_parameters";

    private static final String PASSWORD = "${password}";

    private static final String USERNAME = "${username}";

    private final Map<String, String> parameterMap;

    /**

        final Map<String, String> params = new HashMap<>();
        final String[] keys = { "encoding", "token_url", "token_pattern", "token_name", "token_method", "token_parameters", "login_method",
                "login_url", "login_parameters" };
        for (final String key : keys) {
            final String value = hc4Form.getParameter(key);
            if (value != null) {
                params.put(key, value);
            }
        }