lib/Jejik/MT940/Reader.php
public function setTransactionClass($transactionClass)
    {
        if (!is_callable($transactionClass) && !class_exists($transactionClass)) {
            throw new \InvalidArgumentException('$transactionClass must be a valid classname or a PHP callable');
        }

        $this->transactionClass = $transactionClass;
        return $this;
    }
public function setTransactionClass($transactionClass)
    {
        if (!is_callable($transactionClass) && !class_exists($transactionClass)) {
            throw new \InvalidArgumentException('$transactionClass must be a valid classname or a PHP callable');
        }

        $this->transactionClass = $transactionClass;
        return $this;
    }
Set the classname of the transaction class or callable that returns an object that
implements the StatementInterface.

The callable is not passed any arguments.

$reader->setTransactionClass(function () {
return new My\Transaction();
});

@param string|callable $transactionClass
@return $this