Factory.php

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<?php
namespace Magento\Framework\Profiler\Driver;

use Magento\Framework\Profiler\DriverInterface;

class Factory
{
    protected $_defaultDriverType;

    protected $_defaultDriverPrefix;

    public function __construct(
        $defaultDriverPrefix = 'Magento\Framework\Profiler\Driver\\',
        $defaultDriverType = 'standard'
    ) {
        $this->_defaultDriverPrefix = $defaultDriverPrefix;
        $this->_defaultDriverType = $defaultDriverType;
    }

    public function create(array $config = null)
    {
        $type = isset($config['type']) ? $config['type'] : $this->_defaultDriverType;
        if (class_exists($type)) {
            $class = $type;
        } else {
            $class = $this->_defaultDriverPrefix . ucfirst($type);
            if (!class_exists($class)) {
                throw new \InvalidArgumentException(
                    sprintf("Cannot create profiler driver, class \"%s\" doesn't exist.", $class)
                );
            }
        }
        $driver = new $class($config);
        if (!$driver instanceof DriverInterface) {
            throw new \InvalidArgumentException(
                sprintf(
                    "Driver class \"%s\" must implement \Magento\Framework\Profiler\DriverInterface.",
                    get_class($driver)
                )
            );
        }
        return $driver;
    }
}