SearchTermDescriptionGenerator.php

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<?php
namespace Magento\Setup\Model;

class SearchTermDescriptionGenerator implements DescriptionGeneratorInterface
{
    private $descriptionGenerator;

    private $searchTermManager;

    private $cachedDescription;

    public function __construct(
        \Magento\Setup\Model\Description\DescriptionGenerator $descriptionGenerator,
        \Magento\Setup\Model\SearchTermManager $searchTermManager
    ) {
        $this->descriptionGenerator = $descriptionGenerator;
        $this->searchTermManager = $searchTermManager;
    }

    public function generate($currentProductIndex)
    {
        $description = $this->getDescription();
        $this->searchTermManager->applySearchTermsToDescription($description, (int) $currentProductIndex);

        return $description;
    }

    private function getDescription($useCachedDescription = true)
    {
        if ($useCachedDescription !== true || $this->cachedDescription === null) {
            $this->cachedDescription = $this->descriptionGenerator->generate();
        }

        return $this->cachedDescription;
    }
}