PriceModifier.php

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<?php
namespace Magento\CatalogRule\Model\Product;

use Magento\Catalog\Model\Product;
use Magento\Catalog\Model\Product\PriceModifierInterface;
use Magento\CatalogRule\Model\RuleFactory;

class PriceModifier implements PriceModifierInterface
{
    protected $ruleFactory;

    public function __construct(RuleFactory $ruleFactory)
    {
        $this->ruleFactory = $ruleFactory;
    }

    public function modifyPrice($price, Product $product)
    {
        if ($price !== null) {
            $resultPrice = $this->ruleFactory->create()->calcProductPriceRule($product, $price);
            if ($resultPrice !== null) {
                $price = $resultPrice;
            }
        }
        return $price;
    }
}