Adapter.php

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<?php
namespace Magento\ImportExport\Model\Import;

use Magento\Framework\Filesystem\Directory\Write;

class Adapter
{
    public static function factory($type, $directory, $source, $options = null)
    {
        if (!is_string($type) || !$type) {
            throw new \Magento\Framework\Exception\LocalizedException(
                __('The adapter type must be a non-empty string.')
            );
        }
        $adapterClass = 'Magento\ImportExport\Model\Import\Source\\' . ucfirst(strtolower($type));

        if (!class_exists($adapterClass)) {
            throw new \Magento\Framework\Exception\LocalizedException(
                __('\'%1\' file extension is not supported', $type)
            );
        }
        $adapter = new $adapterClass($source, $directory, $options);

        if (!$adapter instanceof AbstractSource) {
            throw new \Magento\Framework\Exception\LocalizedException(
                __('Adapter must be an instance of \Magento\ImportExport\Model\Import\AbstractSource')
            );
        }
        return $adapter;
    }

    public static function findAdapterFor($source, $directory, $options = null)
    {
        return self::factory(pathinfo($source, PATHINFO_EXTENSION), $directory, $source, $options);
    }
}