ConnectionString( ConnectionType type,
                          const std::string& user,
                          const std::string& password,
                          const std::string& servers,
                          const std::string& database,
                          const std::string& setName,
                          const BSONObj& options )
            : _type( type )
            , _servers( )
            , _setName( setName )
            , _user( user )
            , _password( password )
            , _database( database )
            , _options( options ) {

            _fillServers( servers );
            switch ( _type ) {
            case MASTER:
                verify( _servers.size() == 1 );
                break;
            case SET:
                verify( _setName.size() ); // ->HERE
                verify( _servers.size() >= 1 ); // 1 is ok since we can derive
                break;
            case PAIR:
                verify( _servers.size() == 2 );
                break;
            default:
                verify( _servers.size() > 0 );
            }

            _finishInit();