public function getCurrentFrom(IStateMachine $machine = null): string
    {
        $this->extractFromMachine($machine);

        return $this[static::FIELD__CURRENT_FROM];
    }
public function getCurrentFrom(IStateMachine $machine = null): string
    {
        $this->extractFromMachine($machine);

        return $this[static::FIELD__CURRENT_FROM];
    }
@param $machine

@return string