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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\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
{
}
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