Invoice/EventListener/AbstractInvoiceListener.php
protected function getSaleFromInvoice(InvoiceInterface $invoice)
    {
        if (null === $sale = $invoice->getSale()) {
            $cs = $this->persistenceHelper->getChangeSet($invoice, $this->getSalePropertyPath());
            if (!empty($cs)) {
                $sale = $cs[0];
            }
        }

        if (!$sale instanceof SaleInterface) {
            throw new Exception\RuntimeException("Failed to retrieve invoice's sale.");
        }

        return $sale;
    }
protected function getSaleFromInvoice(InvoiceInterface $invoice)
    {
        if (null === $sale = $invoice->getSale()) {
            $cs = $this->persistenceHelper->getChangeSet($invoice, $this->getSalePropertyPath());
            if (!empty($cs)) {
                $sale = $cs[0];
            }
        }

        if (!$sale instanceof SaleInterface) {
            throw new Exception\RuntimeException("Failed to retrieve invoice's sale.");
        }

        return $sale;
    }
protected function getSaleFromInvoice ( InvoiceInterface $ invoice ) { if ( null === $ sale = $ invoice -> getSale ( ) ) { $ cs = $ this -> persistenceHelper -> getChangeSet ( $ invoice , $ this -> getSalePropertyPath ( ) ) ; if ( ! empty ( $ cs ) ) { $ sale = $ cs [ 0 ] ; } } if ( ! $ sale instanceof SaleInterface ) { throw new Exception \ RuntimeException ( "Failed to retrieve invoice's sale." ) ; } return $ sale ; }
Returns the invoice's sale.

@param InvoiceInterface $invoice

@return SaleInterface|InvoiceSubjectInterface
Returns the invoice s sale .