WebsiteDimensionProvider.php

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<?php
declare(strict_types=1);

namespace Magento\Store\Model\Indexer;

use Magento\Framework\Indexer\Dimension;
use Magento\Store\Model\ResourceModel\Website\CollectionFactory as WebsiteCollectionFactory;
use Magento\Framework\Indexer\DimensionFactory;
use Magento\Framework\Indexer\DimensionProviderInterface;
use Magento\Store\Model\Store;

class WebsiteDimensionProvider implements DimensionProviderInterface
{
    const DIMENSION_NAME = 'ws';

    private $collectionFactory;

    private $websitesDataIterator;

    private $dimensionFactory;

    public function __construct(WebsiteCollectionFactory $collectionFactory, DimensionFactory $dimensionFactory)
    {
        $this->dimensionFactory = $dimensionFactory;
        $this->collectionFactory = $collectionFactory;
    }

    public function getIterator(): \Traversable
    {
        foreach ($this->getWebsites() as $website) {
            yield $this->dimensionFactory->create(self::DIMENSION_NAME, (string)$website);
        }
    }

    private function getWebsites(): array
    {
        if ($this->websitesDataIterator === null) {
            $websites = $this->collectionFactory->create()
                ->addFieldToFilter('code', ['neq' => Store::ADMIN_CODE])
                ->getAllIds();
            $this->websitesDataIterator = is_array($websites) ? $websites : [];
        }

        return $this->websitesDataIterator;
    }
}