public ResponsePacket visit(SetUseSingleSpace request,QuerySession session){
  ResponsePacket response=new ResponsePacket();
  session.setUseRegularSpace(request.isUseSingleSpace());
  return response;
}

public ResponsePacket visit ( SetUseSingleSpace request , QuerySession session ) { ResponsePacket response = new ResponsePacket ( ) ; session . setUseRegularSpace ( request . isUseSingleSpace ( ) ) ; return response ; }
handle set single space [ on off ] request
