edm/PhpOffice/PhpSpreadsheet/Collection/CellsFactory.php

<?php

namespace PhpOffice\PhpSpreadsheet\Collection;

use PhpOffice\PhpSpreadsheet\Settings;
use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;

abstract class CellsFactory
{
    /**
     * Initialise the cache storage.
     *
     * @param Worksheet $parent Enable cell caching for this worksheet
     *
     * @return Cells
     * */
    public static function getInstance(Worksheet $parent)
    {
        $instance = new Cells($parent, Settings::getCache());

        return $instance;
    }
}