class Token {

    public static boolean isValid(String token) {
        if (token == null || token.length() == 0) {
            return false;
        }

        int len = token.length();

        for (int i = 0; i < len; ++i) {
            if (isSeparator(token.charAt(i))) {
                return false;
            }
        }

        return true;
    }

}