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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;
use Ramsey\Uuid\Exception\InvalidArgumentException;
use Ramsey\Uuid\Exception\UnsupportedOperationException;
use Ramsey\Uuid\Rfc4122\FieldsInterface as Rfc4122FieldsInterface;
use Ramsey\Uuid\Uuid;
use Ramsey\Uuid\UuidInterface;
use function strlen;
use function substr;
/**
* OrderedTimeCodec encodes and decodes a UUID, optimizing the byte order for
* more efficient storage
*
* For binary representations of version 1 UUID, this codec may be used to
* reorganize the time fields, making the UUID closer to sequential when storing
* the bytes. According to Percona, this optimization can improve database
* INSERTs and SELECTs using the UUID column as a key.
*
* The string representation of the UUID will remain unchanged. Only the binary
* representation is reordered.
*
* **PLEASE NOTE:** Binary representations of UUIDs encoded with this codec must
* be decoded with this codec. Decoding using another codec can result in
* malformed UUIDs.
*
* @link https://www.percona.com/blog/2014/12/19/store-uuid-optimized-way/ Storing UUID Values in MySQL
*
* @psalm-immutable
*/
class OrderedTimeCodec extends StringCodec
{
/**
* Returns a binary string representation of a UUID, with the timestamp
* fields rearranged for optimized storage
*
* @inheritDoc
* @psalm-return non-empty-string
* @psalm-suppress MoreSpecificReturnType we know that the retrieved `string` is never empty
* @psalm-suppress LessSpecificReturnStatement we know that the retrieved `string` is never empty
*/
public function encodeBinary(UuidInterface $uuid): string
{
if (
!($uuid->getFields() instanceof Rfc4122FieldsInterface)
|| $uuid->getFields()->getVersion() !== Uuid::UUID_TYPE_TIME
) {
throw new InvalidArgumentException(
'Expected RFC 4122 version 1 (time-based) UUID'
);
}
$bytes = $uuid->getFields()->getBytes();
return $bytes[6] . $bytes[7]
. $bytes[4] . $bytes[5]
. $bytes[0] . $bytes[1] . $bytes[2] . $bytes[3]
. substr($bytes, 8);
}
/**
* Returns a UuidInterface derived from an ordered-time binary string
* representation
*
* @throws InvalidArgumentException if $bytes is an invalid length
*
* @inheritDoc
*/
public function decodeBytes(string $bytes): UuidInterface
{
if (strlen($bytes) !== 16) {
throw new InvalidArgumentException(
'$bytes string should contain 16 characters.'
);
}
// Rearrange the bytes to their original order.
$rearrangedBytes = $bytes[4] . $bytes[5] . $bytes[6] . $bytes[7]
. $bytes[2] . $bytes[3]
. $bytes[0] . $bytes[1]
. substr($bytes, 8);
$uuid = parent::decodeBytes($rearrangedBytes);
if (
!($uuid->getFields() instanceof Rfc4122FieldsInterface)
|| $uuid->getFields()->getVersion() !== Uuid::UUID_TYPE_TIME
) {
throw new UnsupportedOperationException(
'Attempting to decode a non-time-based UUID using '
. 'OrderedTimeCodec'
);
}
return $uuid;
}
}
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