Factory.php

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<?php
namespace Magento\Framework\Backup;

use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\ObjectManagerInterface;
use Magento\Framework\Phrase;

class Factory
{
    private $_objectManager;

    const TYPE_DB = 'db';

    const TYPE_FILESYSTEM = 'filesystem';

    const TYPE_SYSTEM_SNAPSHOT = 'snapshot';

    const TYPE_MEDIA = 'media';

    const TYPE_SNAPSHOT_WITHOUT_MEDIA = 'nomedia';

    protected $_allowedTypes;

    public function __construct(ObjectManagerInterface $objectManager)
    {
        $this->_objectManager = $objectManager;
        $this->_allowedTypes = [
            self::TYPE_DB,
            self::TYPE_FILESYSTEM,
            self::TYPE_SYSTEM_SNAPSHOT,
            self::TYPE_MEDIA,
            self::TYPE_SNAPSHOT_WITHOUT_MEDIA,
        ];
    }

    public function create($type)
    {
        if (!in_array($type, $this->_allowedTypes)) {
            throw new LocalizedException(
                new Phrase(
                    'Current implementation not supported this type (%1) of backup.',
                    [$type]
                )
            );
        }
        $class = 'Magento\Framework\Backup\\' . ucfirst($type);
        return $this->_objectManager->create($class);
    }
}