FieldsetPool.php

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<?php
namespace Magento\Framework\Indexer;

use Magento\Framework\ObjectManagerInterface;

class FieldsetPool
{
    protected $objectManager;

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

    public function get($fieldsetClass)
    {
        $handler = $this->objectManager->get($fieldsetClass);
        if (!$handler instanceof FieldsetInterface) {
            throw new \InvalidArgumentException(
                $fieldsetClass . ' doesn\'t implement \Magento\Framework\Indexer\FieldsetInterface'
            );
        }
        return $handler;
    }
}