HttpMethodMap.php

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<?php
declare(strict_types=1);

namespace Magento\Framework\App\Request;

class HttpMethodMap
{
    private $map;

    public function __construct(array $map)
    {
        $this->map = $this->processMap($map);
    }

    private function processMap(array $map): array
    {
        $filtered = [];
        foreach ($map as $method => $interface) {
            $interface = trim(preg_replace('/^\\\+/', '', $interface));
            if (!(interface_exists($interface) || class_exists($interface))) {
                throw new \InvalidArgumentException(
                    "Interface '$interface' does not exist"
                );
            }
            if (!$method) {
                throw new \InvalidArgumentException('Invalid method given');
            }

            $filtered[$method] = $interface;
        }

        return $filtered;
    }

    public function getMap(): array
    {
        return $this->map;
    }
}