ConditionBuilder.php

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<?php
namespace Magento\Catalog\Model\ResourceModel\Attribute;

use Magento\Eav\Model\Entity\Attribute\AbstractAttribute;
use Magento\Framework\EntityManager\EntityMetadataInterface;
use Magento\Store\Api\Data\StoreInterface;
use Magento\Store\Model\Store;
use Magento\Store\Model\StoreManagerInterface;
use Magento\Catalog\Model\ResourceModel\Eav\Attribute as CatalogEavAttribute;
use Magento\Store\Model\Website;
use Magento\Framework\Model\Entity\ScopeInterface;

class ConditionBuilder
{
    private $storeManager;

    public function __construct(StoreManagerInterface $storeManager)
    {
        $this->storeManager = $storeManager;
    }

    public function buildExistingAttributeWebsiteScope(
        AbstractAttribute $attribute,
        EntityMetadataInterface $metadata,
        array $scopes,
        $linkFieldValue
    ) {
        $website = $this->getWebsiteForWebsiteScope($scopes);
        if (!$website) {
            return [];
        }
        $storeIds = $website->getStoreIds();

        $condition = [
            $metadata->getLinkField() . ' = ?' => $linkFieldValue,
            'attribute_id = ?' => $attribute->getAttributeId(),
        ];

        $conditions = [];
        foreach ($storeIds as $storeId) {
            $identifier = $metadata->getEntityConnection()->quoteIdentifier(Store::STORE_ID);
            $condition[$identifier . ' = ?'] = $storeId;
            $conditions[] = $condition;
        }

        return $conditions;
    }

    public function buildNewAttributesWebsiteScope(
        AbstractAttribute $attribute,
        EntityMetadataInterface $metadata,
        array $scopes,
        $linkFieldValue
    ) {
        $website = $this->getWebsiteForWebsiteScope($scopes);
        if (!$website) {
            return [];
        }
        $storeIds = $website->getStoreIds();

        $condition = [
            $metadata->getLinkField() => $linkFieldValue,
            'attribute_id' => $attribute->getAttributeId(),
        ];

        $conditions = [];
        foreach ($storeIds as $storeId) {
            $condition[Store::STORE_ID] = $storeId;
            $conditions[] = $condition;
        }

        return $conditions;
    }

    private function getWebsiteForWebsiteScope(array $scopes)
    {
        $store = $this->getStoreFromScopes($scopes);
        return $store ? $store->getWebsite() : null;
    }

    private function getStoreFromScopes(array $scopes)
    {
        foreach ($scopes as $scope) {
            if (Store::STORE_ID === $scope->getIdentifier()) {
                return $this->storeManager->getStore($scope->getValue());
            }
        }

        return null;
    }
}