SwatchAttributeType.php

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<?php
declare(strict_types=1);

namespace Magento\Swatches\Model;

use Magento\Eav\Api\Data\AttributeInterface;
use Magento\Framework\Serialize\Serializer\Json;

class SwatchAttributeType
{
    private $serializer;

    private $eavAttributeAdditionalDataKeys = [
        Swatch::SWATCH_INPUT_TYPE_KEY,
        'update_product_preview_image',
        'use_product_image_for_swatch',
    ];

    public function __construct(Json $serializer)
    {
        $this->serializer = $serializer;
    }

    public function isTextSwatch(AttributeInterface $productAttribute): bool
    {
        $this->populateAdditionalDataEavAttribute($productAttribute);

        return $productAttribute->getData(Swatch::SWATCH_INPUT_TYPE_KEY) === Swatch::SWATCH_INPUT_TYPE_TEXT;
    }

    public function isVisualSwatch(AttributeInterface $productAttribute): bool
    {
        $this->populateAdditionalDataEavAttribute($productAttribute);

        return $productAttribute->getData(Swatch::SWATCH_INPUT_TYPE_KEY) === Swatch::SWATCH_INPUT_TYPE_VISUAL;
    }

    public function isSwatchAttribute(AttributeInterface $productAttribute): bool
    {
        return $this->isTextSwatch($productAttribute) || $this->isVisualSwatch($productAttribute);
    }

    private function populateAdditionalDataEavAttribute(AttributeInterface $attribute): void
    {
        if (!$attribute->hasData(Swatch::SWATCH_INPUT_TYPE_KEY)) {
            $serializedAdditionalData = $attribute->getData('additional_data');
            if ($serializedAdditionalData) {
                $additionalData = $this->serializer->unserialize($serializedAdditionalData);
                if ($additionalData !== null && is_array($additionalData)) {
                    foreach ($this->eavAttributeAdditionalDataKeys as $key) {
                        if (isset($additionalData[$key])) {
                            $attribute->setData($key, $additionalData[$key]);
                        }
                    }
                }
            }
        }
    }
}