import org.apache.commons.codec.digest.DigestUtils;

public class Gravatar {
    private final static String URL = "http://www.gravatar.com/avatar/";

    public String getId(String mail) {
	return DigestUtils.md5Hex(mail.toLowerCase().trim());
    }

    public String getAvatarUrl(String mail) {
	return URL + getId(mail);
    }
}