ConfigurableAttributeHandler.php

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<?php
namespace Magento\ConfigurableProduct\Model;

class ConfigurableAttributeHandler
{
    protected $collectionFactory;

    public function __construct(
        \Magento\Catalog\Model\ResourceModel\Product\Attribute\CollectionFactory $attributeColFactory
    ) {
        $this->collectionFactory = $attributeColFactory;
    }

    public function getApplicableAttributes()
    {
        $collection = $this->collectionFactory->create();
        return $collection->addFieldToFilter(
            'frontend_input',
            'select'
        )->addFieldToFilter(
            'is_user_defined',
            1
        )->addFieldToFilter(
            'is_global',
            \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_GLOBAL
        );
    }

    public function isAttributeApplicable($attribute)
    {
        $types = [
            \Magento\Catalog\Model\Product\Type::TYPE_SIMPLE,
            \Magento\Catalog\Model\Product\Type::TYPE_VIRTUAL,
            \Magento\ConfigurableProduct\Model\Product\Type\Configurable::TYPE_CODE,
        ];
        return !$attribute->getApplyTo() || count(array_diff($types, $attribute->getApplyTo())) === 0;
    }
}