52 lines
1.6 KiB
PHP
52 lines
1.6 KiB
PHP
<?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\Codec;
|
|
|
|
/**
|
|
* TimestampLastCombCodec encodes and decodes COMBs, with the timestamp as the
|
|
* last 48 bits
|
|
*
|
|
* The CombGenerator when used with the StringCodec (and, by proxy, the
|
|
* TimestampLastCombCodec) adds the timestamp to the last 48 bits of the COMB.
|
|
* The TimestampLastCombCodec is provided for the sake of consistency. In
|
|
* practice, it is identical to the standard StringCodec but, it may be used
|
|
* with the CombGenerator for additional context when reading code.
|
|
*
|
|
* Consider the following code. By default, the codec used by UuidFactory is the
|
|
* StringCodec, but here, we explicitly set the TimestampLastCombCodec. It is
|
|
* redundant, but it is clear that we intend this COMB to be generated with the
|
|
* timestamp appearing at the end.
|
|
*
|
|
* ``` php
|
|
* $factory = new UuidFactory();
|
|
*
|
|
* $factory->setCodec(new TimestampLastCombCodec($factory->getUuidBuilder()));
|
|
*
|
|
* $factory->setRandomGenerator(new CombGenerator(
|
|
* $factory->getRandomGenerator(),
|
|
* $factory->getNumberConverter()
|
|
* ));
|
|
*
|
|
* $timestampLastComb = $factory->uuid4();
|
|
* ```
|
|
*
|
|
* @link https://www.informit.com/articles/printerfriendly/25862 The Cost of GUIDs as Primary Keys
|
|
*
|
|
* @psalm-immutable
|
|
*/
|
|
class TimestampLastCombCodec extends StringCodec
|
|
{
|
|
}
|