DataPersistor.php

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

use Magento\Framework\Session\SessionManagerInterface;

class DataPersistor implements DataPersistorInterface
{
    protected $session;

    public function __construct(
        SessionManagerInterface $session
    ) {
        $this->session = $session;
    }

    public function set($key, $data)
    {
        $method = 'set' . ucfirst($key) . 'Data';
        call_user_func_array([$this->session, $method], [$data]);
    }

    public function get($key)
    {
        $method = 'get' . ucfirst($key) . 'Data';
        return call_user_func_array([$this->session, $method], []);
    }

    public function clear($key)
    {
        $method = 'uns' . ucfirst($key) . 'Data';
        call_user_func_array([$this->session, $method], []);
    }
}