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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\Converter\Time;
use Ramsey\Uuid\Converter\TimeConverterInterface;
use Ramsey\Uuid\Math\CalculatorInterface;
use Ramsey\Uuid\Math\RoundingMode;
use Ramsey\Uuid\Type\Hexadecimal;
use Ramsey\Uuid\Type\Integer as IntegerObject;
use Ramsey\Uuid\Type\Time;
use function explode;
use function str_pad;
use const STR_PAD_LEFT;
/**
* GenericTimeConverter uses the provided calculator to calculate and convert
* time values
*
* @psalm-immutable
*/
class GenericTimeConverter implements TimeConverterInterface
{
/**
* The number of 100-nanosecond intervals from the Gregorian calendar epoch
* to the Unix epoch.
*/
private const GREGORIAN_TO_UNIX_INTERVALS = '122192928000000000';
/**
* The number of 100-nanosecond intervals in one second.
*/
private const SECOND_INTERVALS = '10000000';
/**
* The number of 100-nanosecond intervals in one microsecond.
*/
private const MICROSECOND_INTERVALS = '10';
/**
* @var CalculatorInterface
*/
private $calculator;
public function __construct(CalculatorInterface $calculator)
{
$this->calculator = $calculator;
}
public function calculateTime(string $seconds, string $microseconds): Hexadecimal
{
$timestamp = new Time($seconds, $microseconds);
// Convert the seconds into a count of 100-nanosecond intervals.
$sec = $this->calculator->multiply(
$timestamp->getSeconds(),
new IntegerObject(self::SECOND_INTERVALS)
);
// Convert the microseconds into a count of 100-nanosecond intervals.
$usec = $this->calculator->multiply(
$timestamp->getMicroseconds(),
new IntegerObject(self::MICROSECOND_INTERVALS)
);
// Combine the seconds and microseconds intervals and add the count of
// 100-nanosecond intervals from the Gregorian calendar epoch to the
// Unix epoch. This gives us the correct count of 100-nanosecond
// intervals since the Gregorian calendar epoch for the given seconds
// and microseconds.
/** @var IntegerObject $uuidTime */
$uuidTime = $this->calculator->add(
$sec,
$usec,
new IntegerObject(self::GREGORIAN_TO_UNIX_INTERVALS)
);
$uuidTimeHex = str_pad(
$this->calculator->toHexadecimal($uuidTime)->toString(),
16,
'0',
STR_PAD_LEFT
);
return new Hexadecimal($uuidTimeHex);
}
public function convertTime(Hexadecimal $uuidTimestamp): Time
{
// From the total, subtract the number of 100-nanosecond intervals from
// the Gregorian calendar epoch to the Unix epoch. This gives us the
// number of 100-nanosecond intervals from the Unix epoch, which also
// includes the microtime.
$epochNanoseconds = $this->calculator->subtract(
$this->calculator->toInteger($uuidTimestamp),
new IntegerObject(self::GREGORIAN_TO_UNIX_INTERVALS)
);
// Convert the 100-nanosecond intervals into seconds and microseconds.
$unixTimestamp = $this->calculator->divide(
RoundingMode::HALF_UP,
6,
$epochNanoseconds,
new IntegerObject(self::SECOND_INTERVALS)
);
$split = explode('.', (string) $unixTimestamp, 2);
return new Time($split[0], $split[1] ?? 0);
}
}
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