ImporterPool.php

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<?php
namespace Magento\Deploy\Model\DeploymentConfig;

use Magento\Framework\App\DeploymentConfig\ValidatorInterface;
use Magento\Framework\Exception\ConfigurationMismatchException;
use Magento\Framework\ObjectManagerInterface;

class ImporterPool
{
    private $importers = [];

    private $sortedImporters = [];

    private $objectManager;

    private $validatorFactory;

    public function __construct(
        ObjectManagerInterface $objectManager,
        ValidatorFactory $validatorFactory,
        array $importers = []
    ) {
        $this->objectManager = $objectManager;
        $this->validatorFactory = $validatorFactory;
        $this->importers = $importers;
    }

    public function getSections()
    {
        return array_keys($this->importers);
    }

    public function getImporters()
    {
        if (!$this->sortedImporters) {
            $sortedImporters = [];

            foreach ($this->sort($this->importers) as $section => $importer) {
                if (empty($importer['importer_class'])) {
                    throw new ConfigurationMismatchException(
                        __('The parameter "importer_class" is missing. Set the "importer_class" and try again.')
                    );
                }

                $sortedImporters[$section] = $importer['importer_class'];
            }

            $this->sortedImporters = $sortedImporters;
        }

        return $this->sortedImporters;
    }

    public function getValidator($section)
    {
        if (isset($this->importers[$section]) && !empty($this->importers[$section]['validator_class'])) {
            return $this->validatorFactory->create($this->importers[$section]['validator_class']);
        }
        return null;
    }

    private function sort(array $data)
    {
        uasort($data, function (array $a, array $b) {
            $a['sort_order'] = $this->getSortOrder($a);
            $b['sort_order'] = $this->getSortOrder($b);

            if ($a['sort_order'] == $b['sort_order']) {
                return 0;
            }

            return ($a['sort_order'] < $b['sort_order']) ? -1 : 1;
        });

        return $data;
    }

    private function getSortOrder(array $variable)
    {
        return !empty($variable['sort_order']) ? $variable['sort_order'] : 0;
    }
}