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<?php
/**
* This file is part of the ramsey/uuid library
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*
* @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
* @license http://opensource.org/licenses/MIT MIT
*/
declare(strict_types=1);
namespace Ramsey\Uuid\Provider\Node;
use Ramsey\Uuid\Exception\InvalidArgumentException;
use Ramsey\Uuid\Provider\NodeProviderInterface;
use Ramsey\Uuid\Type\Hexadecimal;
use function dechex;
use function hexdec;
use function str_pad;
use function substr;
use const STR_PAD_LEFT;
/**
* StaticNodeProvider provides a static node value with the multicast bit set
*
* @link http://tools.ietf.org/html/rfc4122#section-4.5 RFC 4122, § 4.5: Node IDs that Do Not Identify the Host
*/
class StaticNodeProvider implements NodeProviderInterface
{
/**
* @var Hexadecimal
*/
private $node;
/**
* @param Hexadecimal $node The static node value to use
*/
public function __construct(Hexadecimal $node)
{
if (strlen($node->toString()) > 12) {
throw new InvalidArgumentException(
'Static node value cannot be greater than 12 hexadecimal characters'
);
}
$this->node = $this->setMulticastBit($node);
}
public function getNode(): Hexadecimal
{
return $this->node;
}
/**
* Set the multicast bit for the static node value
*/
private function setMulticastBit(Hexadecimal $node): Hexadecimal
{
$nodeHex = str_pad($node->toString(), 12, '0', STR_PAD_LEFT);
$firstOctet = substr($nodeHex, 0, 2);
$firstOctet = str_pad(
dechex(hexdec($firstOctet) | 0x01),
2,
'0',
STR_PAD_LEFT
);
return new Hexadecimal($firstOctet . substr($nodeHex, 2));
}
}