SourceFactory.php

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<?php
namespace Magento\Framework\App\ResourceConnection;

class SourceFactory
{
    protected $objectManager;

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

    public function create($className)
    {
        $source = $this->objectManager->create($className);
        if (!$source instanceof SourceProviderInterface) {
            throw new \InvalidArgumentException(
                $className . ' doesn\'t implement \Magento\Framework\App\ResourceConnection\SourceProviderInterface'
            );
        }

        return $source;
    }
}