StructureFactory.php

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<?php
namespace Magento\Framework\Indexer;

class StructureFactory
{
    protected $objectManager;

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

    public function create($className, $arguments = [])
    {
        $structure = $this->objectManager->create($className, $arguments);
        if (!$structure instanceof IndexStructureInterface) {
            throw new \InvalidArgumentException(
                $className . ' doesn\'t implement \Magento\Framework\Indexer\IndexStructureInterface'
            );
        }

        return $structure;
    }
}