PageSizeProvider.php

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<?php
declare(strict_types=1);

namespace Magento\Search\Model\Search;

class PageSizeProvider
{
    private $engineResolver;

    private $pageSizeBySearchEngine;

    public function __construct(
        \Magento\Search\Model\EngineResolver $engineResolver,
        array $pageSizeBySearchEngine = []
    ) {
        $this->engineResolver = $engineResolver;
        $this->pageSizeBySearchEngine = $pageSizeBySearchEngine;
    }

    public function getMaxPageSize() : int
    {
        $searchEngine = $this->engineResolver->getCurrentSearchEngine();

        $pageSize = PHP_INT_MAX;
        if (isset($this->pageSizeBySearchEngine[$searchEngine])) {
            $pageSize = $this->pageSizeBySearchEngine[$searchEngine];
        }

        return (int)$pageSize;
    }
}