FinalPrice.php

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<?php
namespace Magento\Catalog\Pricing\Price;

use Magento\Catalog\Model\Product;
use Magento\Framework\Pricing\Price\AbstractPrice;

class FinalPrice extends AbstractPrice implements FinalPriceInterface
{
    const PRICE_CODE = 'final_price';

    private $basePrice;

    protected $minimalPrice;

    protected $maximalPrice;

    public function getValue()
    {
        return max(0, $this->getBasePrice()->getValue());
    }

    public function getMinimalPrice()
    {
        if (!$this->minimalPrice) {
            $minimalPrice = $this->product->getMinimalPrice();
            if ($minimalPrice === null) {
                $minimalPrice = $this->getValue();
            } else {
                $minimalPrice = $this->priceCurrency->convertAndRound($minimalPrice);
            }
            $this->minimalPrice = $this->calculator->getAmount($minimalPrice, $this->product);
        }
        return $this->minimalPrice;
    }

    public function getMaximalPrice()
    {
        if (!$this->maximalPrice) {
            $maximalPrice = $this->product->getMaximalPrice();
            if ($maximalPrice === null) {
                $maximalPrice = $this->getValue();
            } else {
                $maximalPrice = $this->priceCurrency->convertAndRound($maximalPrice);
            }
            $this->maximalPrice = $this->calculator->getAmount($maximalPrice, $this->product);
        }
        return $this->maximalPrice;
    }

    protected function getBasePrice()
    {
        if (!$this->basePrice) {
            $this->basePrice = $this->priceInfo->getPrice(BasePrice::PRICE_CODE);
        }
        return $this->basePrice;
    }
}