EntryConverterPool.php

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<?php
namespace Magento\Catalog\Model\Product\Attribute\Backend\Media;

class EntryConverterPool
{
    private $mediaGalleryEntryConvertersCollection;

    public function __construct(array $mediaGalleryEntryConvertersCollection)
    {
        foreach ($mediaGalleryEntryConvertersCollection as $converter) {
            if (!$converter instanceof EntryConverterInterface) {
                throw new \InvalidArgumentException(
                    __('Media Gallery converter should be an instance of EntryConverterInterface.')
                );
            }
        }
        $this->mediaGalleryEntryConvertersCollection = $mediaGalleryEntryConvertersCollection;
    }

    public function getConverterByMediaType($mediaType)
    {
        foreach ($this->mediaGalleryEntryConvertersCollection as $converter) {
            if ($converter->getMediaEntryType() == $mediaType) {
                return $converter;
            }
        }
        throw new \Magento\Framework\Exception\LocalizedException(
            __('There is no MediaGalleryEntryConverter for given type')
        );
    }
}