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<?php |
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|
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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 <[email protected]> |
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* @license http://opensource.org/licenses/MIT MIT |
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*/ |
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|
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declare(strict_types=1); |
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|
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namespace Ramsey\Uuid\Codec; |
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|
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use Ramsey\Uuid\Exception\InvalidUuidStringException; |
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use Ramsey\Uuid\UuidInterface; |
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|
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use function bin2hex; |
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use function sprintf; |
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use function substr; |
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use function substr_replace; |
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|
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/** |
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* TimestampFirstCombCodec encodes and decodes COMBs, with the timestamp as the |
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* first 48 bits |
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* |
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* In contrast with the TimestampLastCombCodec, the TimestampFirstCombCodec |
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* adds the timestamp to the first 48 bits of the COMB. To generate a |
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* timestamp-first COMB, set the TimestampFirstCombCodec as the codec, along |
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* with the CombGenerator as the random generator. |
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* |
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* ``` php |
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* $factory = new UuidFactory(); |
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* |
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* $factory->setCodec(new TimestampFirstCombCodec($factory->getUuidBuilder())); |
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* |
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* $factory->setRandomGenerator(new CombGenerator( |
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* $factory->getRandomGenerator(), |
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* $factory->getNumberConverter() |
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* )); |
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* |
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* $timestampFirstComb = $factory->uuid4(); |
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* ``` |
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* |
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* @link https://www.informit.com/articles/printerfriendly/25862 The Cost of GUIDs as Primary Keys |
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* |
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* @psalm-immutable |
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*/ |
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class TimestampFirstCombCodec extends StringCodec |
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{ |
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/** |
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* @psalm-return non-empty-string |
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* @psalm-suppress MoreSpecificReturnType we know that the retrieved `string` is never empty |
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* @psalm-suppress LessSpecificReturnStatement we know that the retrieved `string` is never empty |
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*/ |
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public function encode(UuidInterface $uuid): string |
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{ |
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$bytes = $this->swapBytes($uuid->getFields()->getBytes()); |
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|
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return sprintf( |
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'%08s-%04s-%04s-%04s-%012s', |
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bin2hex(substr($bytes, 0, 4)), |
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bin2hex(substr($bytes, 4, 2)), |
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bin2hex(substr($bytes, 6, 2)), |
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bin2hex(substr($bytes, 8, 2)), |
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bin2hex(substr($bytes, 10)) |
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); |
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} |
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|
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/** |
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* @psalm-return non-empty-string |
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* @psalm-suppress MoreSpecificReturnType we know that the retrieved `string` is never empty |
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* @psalm-suppress LessSpecificReturnStatement we know that the retrieved `string` is never empty |
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*/ |
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public function encodeBinary(UuidInterface $uuid): string |
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{ |
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/** @phpstan-ignore-next-line PHPStan complains that this is not a non-empty-string. */ |
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return $this->swapBytes($uuid->getFields()->getBytes()); |
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} |
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|
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/** |
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* @throws InvalidUuidStringException |
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* |
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* @inheritDoc |
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*/ |
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public function decode(string $encodedUuid): UuidInterface |
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{ |
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$bytes = $this->getBytes($encodedUuid); |
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|
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return $this->getBuilder()->build($this, $this->swapBytes($bytes)); |
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} |
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|
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public function decodeBytes(string $bytes): UuidInterface |
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{ |
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return $this->getBuilder()->build($this, $this->swapBytes($bytes)); |
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} |
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|
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/** |
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* Swaps bytes according to the timestamp-first COMB rules |
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*/ |
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private function swapBytes(string $bytes): string |
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{ |
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$first48Bits = substr($bytes, 0, 6); |
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$last48Bits = substr($bytes, -6); |
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|
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$bytes = substr_replace($bytes, $last48Bits, 0, 6); |
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$bytes = substr_replace($bytes, $first48Bits, -6); |
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|
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return $bytes; |
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} |
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} |
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|
