Email Address Validation in Blackberry

 If validateEmailID returns true, then the entered email address is valid.

public static boolean validateEmailID(String email) {
        email = email.trim();
        String reverse = new StringBuffer(email).reverse().toString();
        if (email == null || email.length() == 0 || email.indexOf("@") == -1) {
            return false;
        }
        int emailLength = email.length();
        int atPosition = email.indexOf("@");
        int atDot = reverse.indexOf(".");

        String beforeAt = email.substring(0, atPosition);
        String afterAt = email.substring(atPosition + 1, emailLength);

        if (beforeAt.length() == 0 || afterAt.length() == 0) {
            return false;
        }
        for (int i = 0; email.length() - 1 > i; i++) {
            char i1 = email.charAt(i);
            char i2 = email.charAt(i + 1);
            if (i1 == '.' && i2 == '.') {
                return false;
            }
        }
        if (email.charAt(atPosition - 1) == '.' || email.charAt(0) == '.' || email.charAt(atPosition + 1) == '.' || afterAt.indexOf("@") != -1 || atDot < 2) {
            return false;
        }

        return true;
    }