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Directory >> /home/softsuitetech/public_html/DEMO/sidebyside/vendor/ramsey/uuid/src/Generator/

File / Folder	Size	Action
.	-
CombGenerator.php	3.12KB	edt ren
DceSecurityGenerator.php	4.344KB	edt ren
DceSecurityGeneratorInt...	1.707KB	edt ren
DefaultNameGenerator.php	1.237KB	edt ren
DefaultTimeGenerator.php	3.8KB	edt ren
NameGeneratorFactory.php	0.682KB	edt ren
NameGeneratorInterface.php	1.041KB	edt ren
PeclUuidNameGenerator.php	1.32KB	edt ren
PeclUuidRandomGenerator...	0.788KB	edt ren
PeclUuidTimeGenerator.php	0.853KB	edt ren
RandomBytesGenerator.php	1.117KB	edt ren
RandomGeneratorFactory.php	0.691KB	edt ren
RandomGeneratorInterfac...	0.718KB	edt ren
RandomLibAdapter.php	1.521KB	edt ren
TimeGeneratorFactory.php	1.134KB	edt ren
TimeGeneratorInterface.php	1.131KB	edt ren
UnixTimeGenerator.php	5.833KB	edt ren

<?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\Generator;

use Ramsey\Uuid\Converter\NumberConverterInterface;
use Ramsey\Uuid\Exception\InvalidArgumentException;

use function bin2hex;
use function explode;
use function hex2bin;
use function microtime;
use function str_pad;
use function substr;

use const STR_PAD_LEFT;

/**
 * CombGenerator generates COMBs (combined UUID/timestamp)
 *
 * The CombGenerator, when used with the StringCodec (and, by proxy, the
 * TimestampLastCombCodec) or the TimestampFirstCombCodec, combines the current
 * timestamp with a UUID (hence the name "COMB"). The timestamp either appears
 * as the first or last 48 bits of the COMB, depending on the codec used.
 *
 * By default, COMBs will have the timestamp set as the last 48 bits of the
 * identifier.
 *
 * ``` php
 * $factory = new UuidFactory();
 *
 * $factory->setRandomGenerator(new CombGenerator(
 *     $factory->getRandomGenerator(),
 *     $factory->getNumberConverter()
 * ));
 *
 * $comb = $factory->uuid4();
 * ```
 *
 * To generate a COMB with the timestamp as the first 48 bits, set the
 * TimestampFirstCombCodec as the codec.
 *
 * ``` php
 * $factory->setCodec(new TimestampFirstCombCodec($factory->getUuidBuilder()));
 * ```
 *
 * @link https://www.informit.com/articles/printerfriendly/25862 The Cost of GUIDs as Primary Keys
 */
class CombGenerator implements RandomGeneratorInterface
{
    public const TIMESTAMP_BYTES = 6;

public function __construct(
        private RandomGeneratorInterface $generator,
        private NumberConverterInterface $numberConverter
    ) {
    }

/**
     * @throws InvalidArgumentException if $length is not a positive integer
     *     greater than or equal to CombGenerator::TIMESTAMP_BYTES
     *
     * @inheritDoc
     */
    public function generate(int $length): string
    {
        if ($length < self::TIMESTAMP_BYTES) {
            throw new InvalidArgumentException(
                'Length must be a positive integer greater than or equal to ' . self::TIMESTAMP_BYTES
            );
        }

$hash = '';
        if (self::TIMESTAMP_BYTES > 0 && $length > self::TIMESTAMP_BYTES) {
            $hash = $this->generator->generate($length - self::TIMESTAMP_BYTES);
        }

$lsbTime = str_pad(
            $this->numberConverter->toHex($this->timestamp()),
            self::TIMESTAMP_BYTES * 2,
            '0',
            STR_PAD_LEFT
        );

return (string) hex2bin(
            str_pad(
                bin2hex($hash),
                $length - self::TIMESTAMP_BYTES,
                '0'
            )
            . $lsbTime
        );
    }

/**
     * Returns current timestamp a string integer, precise to 0.00001 seconds
     */
    private function timestamp(): string
    {
        $time = explode(' ', microtime(false));

return $time[1] . substr($time[0], 2, 5);
    }
}