CarrierFactory.php

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<?php
namespace Magento\Shipping\Model;

class CarrierFactory implements CarrierFactoryInterface
{
    protected $_scopeConfig;

    protected $_objectManager;

    public function __construct(
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
        \Magento\Framework\ObjectManagerInterface $objectManager
    ) {
        $this->_scopeConfig = $scopeConfig;
        $this->_objectManager = $objectManager;
    }

    public function get($carrierCode)
    {
        $className = $this->_scopeConfig->getValue(
            'carriers/' . $carrierCode . '/model',
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
        if (!$className) {
            return false;
        }
        $carrier = $this->_objectManager->get($className);
        $carrier->setId($carrierCode);
        return $carrier;
    }

    public function create($carrierCode, $storeId = null)
    {
        $className = $this->_scopeConfig->getValue(
            'carriers/' . $carrierCode . '/model',
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE,
            $storeId
        );
        if (!$className) {
            return false;
        }
        $carrier = $this->_objectManager->create($className);
        $carrier->setId($carrierCode);
        if ($storeId) {
            $carrier->setStore($storeId);
        }
        return $carrier;
    }

    public function getIfActive($carrierCode)
    {
        return $this->_scopeConfig->isSetFlag(
            'carriers/' . $carrierCode . '/active',
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        ) ? $this->get(
            $carrierCode
        ) : false;
    }

    public function createIfActive($carrierCode, $storeId = null)
    {
        return $this->_scopeConfig->isSetFlag(
            'carriers/' . $carrierCode . '/active',
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE,
            $storeId
        ) ? $this->create(
            $carrierCode,
            $storeId
        ) : false;
    }
}