ReadHandler.php

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<?php
namespace Magento\Downloadable\Model\Sample;

use Magento\Downloadable\Api\SampleRepositoryInterface as SampleRepository;
use Magento\Framework\EntityManager\Operation\ExtensionInterface;

class ReadHandler implements ExtensionInterface
{
    protected $sampleRepository;

    public function __construct(SampleRepository $sampleRepository)
    {
        $this->sampleRepository = $sampleRepository;
    }

    public function execute($entity, $arguments = [])
    {
        if ($entity->getTypeId() != \Magento\Downloadable\Model\Product\Type::TYPE_DOWNLOADABLE) {
            return $entity;
        }
        $entityExtension = $entity->getExtensionAttributes();
        $samples = $this->sampleRepository->getSamplesByProduct($entity);
        if ($samples) {
            $entityExtension->setDownloadableProductSamples($samples);
        }
        $entity->setExtensionAttributes($entityExtension);
        return $entity;
    }
}