EmailValidator.java

package ilarkesto.form.validator;

import ilarkesto.form.ValidationException;

import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;

/**
 * @author <A href="mailto:wi@koczewski.de">Witoslaw Koczewski </A>
 * @version 1 $Revision: 1.5 $ $Author: wko $ $Date: 2006/10/26 17:56:53 $
 */
public class EmailValidator implements Validator {

    public static final EmailValidator THIS = new EmailValidator();

    private static final String MSG = "Die Eingabe muss eine g\u00FCltige Email-Adresse sein. Beispiel: \"wi@koczewski.de\" oder \"Witoslaw Koczewski <wi@koczewski.de>\"";

    // overriding
    public String validate(String s) throws ValidationException {
        s = s.trim();
        if (s.length() < 5) throw new ValidationException(MSG);
        int idx = s.indexOf('@');
        if (idx < 1) throw new ValidationException(MSG);

        // if (idx >= s.length() - 3) throw new ValidationException(MSG);
        // int idx2 = s.lastIndexOf('.');
        // if (idx2 < 3) throw new ValidationException(MSG);
        // if (idx2 <= idx) throw new ValidationException(MSG);
        // if (idx2 >= s.length() - 1) throw new ValidationException(MSG);

        try {
            InternetAddress.parse(s.replace(';', ','));
        } catch (AddressException ex) {
            throw new ValidationException(ex.getLocalizedMessage() + ". " + MSG);
        }
        return s;
    }

}