Factory.php

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<?php
namespace Magento\Framework\Pricing\Adjustment;

class Factory
{
    protected $objectManager;

    public function __construct(\Magento\Framework\ObjectManagerInterface $objectManager)
    {
        $this->objectManager = $objectManager;
    }

    public function create($className, array $arguments = [])
    {
        $adjustment = $this->objectManager->create($className, $arguments);
        if (!$adjustment instanceof AdjustmentInterface) {
            throw new \InvalidArgumentException(
                $className . ' doesn\'t implement \Magento\Framework\Pricing\Adjustment\AdjustmentInterface'
            );
        }
        return $adjustment;
    }
}