protected OAuthCalculator getOAuthCalculator(final OAuth1AuthInfo info) {
final RequestToken token = new RequestToken(info.getAccessToken(),
info.getAccessTokenSecret());
final Configuration c = getConfiguration();
final ConsumerKey cK = new ConsumerKey(
c.getString(SettingKeys.CONSUMER_KEY),
c.getString(SettingKeys.CONSUMER_SECRET));
return new OAuthCalculator(cK, token);
}