getPurchase example

if ($price->getCurrencyId() !== $context->getCurrency()->getId()) {
            $value *= $context->getContext()->getCurrencyFactor();
        }

        return $value;
    }

    private function buildReferencePriceDefinition(ReferencePriceDto $definition, UnitCollection $units): ?ReferencePriceDefinition
    {
        if (
            $definition->getPurchase() === null
            || $definition->getPurchase() <= 0
            || $definition->getUnitId() === null
            || $definition->getReference() === null
            || $definition->getReference() <= 0
            || $definition->getPurchase() === $definition->getReference()
        ) {
            return null;
        }

        $unit = $units->get($definition->getUnitId());
        if ($unit === null) {
            

        return new self(
            $product->getPurchaseUnit(),
            $product->getReferenceUnit(),
            $product->getUnitId()
        );
    }

    public static function createFromCheapestPrice(CheapestPrice $price): ReferencePriceDto
    {
        return new ReferencePriceDto($price->getPurchase(), $price->getReference(), $price->getUnitId());
    }

    public function getPurchase(): ?float
    {
        return $this->purchase;
    }

    public function setPurchase(?float $purchase): void
    {
        $this->purchase = $purchase;
    }