125 lines
3.7 KiB
PHP
125 lines
3.7 KiB
PHP
<?php
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/**
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* This file is part of the ramsey/uuid library
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*
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* @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
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* @license http://opensource.org/licenses/MIT MIT
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*/
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declare(strict_types=1);
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namespace Ramsey\Uuid\Converter\Time;
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use Ramsey\Uuid\Converter\TimeConverterInterface;
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use Ramsey\Uuid\Math\CalculatorInterface;
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use Ramsey\Uuid\Math\RoundingMode;
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use Ramsey\Uuid\Type\Hexadecimal;
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use Ramsey\Uuid\Type\Integer as IntegerObject;
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use Ramsey\Uuid\Type\Time;
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use function explode;
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use function str_pad;
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use const STR_PAD_LEFT;
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/**
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* GenericTimeConverter uses the provided calculator to calculate and convert
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* time values
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*
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* @psalm-immutable
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*/
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class GenericTimeConverter implements TimeConverterInterface
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{
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/**
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* The number of 100-nanosecond intervals from the Gregorian calendar epoch
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* to the Unix epoch.
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*/
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private const GREGORIAN_TO_UNIX_INTERVALS = '122192928000000000';
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/**
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* The number of 100-nanosecond intervals in one second.
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*/
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private const SECOND_INTERVALS = '10000000';
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/**
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* The number of 100-nanosecond intervals in one microsecond.
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*/
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private const MICROSECOND_INTERVALS = '10';
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/**
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* @var CalculatorInterface
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*/
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private $calculator;
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public function __construct(CalculatorInterface $calculator)
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{
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$this->calculator = $calculator;
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}
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public function calculateTime(string $seconds, string $microseconds): Hexadecimal
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{
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$timestamp = new Time($seconds, $microseconds);
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// Convert the seconds into a count of 100-nanosecond intervals.
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$sec = $this->calculator->multiply(
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$timestamp->getSeconds(),
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new IntegerObject(self::SECOND_INTERVALS)
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);
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// Convert the microseconds into a count of 100-nanosecond intervals.
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$usec = $this->calculator->multiply(
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$timestamp->getMicroseconds(),
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new IntegerObject(self::MICROSECOND_INTERVALS)
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);
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// Combine the seconds and microseconds intervals and add the count of
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// 100-nanosecond intervals from the Gregorian calendar epoch to the
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// Unix epoch. This gives us the correct count of 100-nanosecond
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// intervals since the Gregorian calendar epoch for the given seconds
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// and microseconds.
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/** @var IntegerObject $uuidTime */
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$uuidTime = $this->calculator->add(
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$sec,
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$usec,
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new IntegerObject(self::GREGORIAN_TO_UNIX_INTERVALS)
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);
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$uuidTimeHex = str_pad(
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$this->calculator->toHexadecimal($uuidTime)->toString(),
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16,
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'0',
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STR_PAD_LEFT
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);
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return new Hexadecimal($uuidTimeHex);
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}
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public function convertTime(Hexadecimal $uuidTimestamp): Time
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{
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// From the total, subtract the number of 100-nanosecond intervals from
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// the Gregorian calendar epoch to the Unix epoch. This gives us the
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// number of 100-nanosecond intervals from the Unix epoch, which also
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// includes the microtime.
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$epochNanoseconds = $this->calculator->subtract(
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$this->calculator->toInteger($uuidTimestamp),
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new IntegerObject(self::GREGORIAN_TO_UNIX_INTERVALS)
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);
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// Convert the 100-nanosecond intervals into seconds and microseconds.
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$unixTimestamp = $this->calculator->divide(
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RoundingMode::HALF_UP,
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6,
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$epochNanoseconds,
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new IntegerObject(self::SECOND_INTERVALS)
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);
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$split = explode('.', (string) $unixTimestamp, 2);
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return new Time($split[0], $split[1] ?? 0);
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}
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}
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