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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
* @link https://benramsey.com/projects/ramsey-uuid/ Documentation
* @link https://packagist.org/packages/ramsey/uuid Packagist
* @link https://github.com/ramsey/uuid GitHub
*/
namespace Ramsey\Uuid\Codec;
use Ramsey\Uuid\UuidInterface;
/**
* TimestampLastCombCodec encodes and decodes COMB UUIDs which have the timestamp as the first 48 bits.
* To be used with MySQL, PostgreSQL, Oracle.
*/
class TimestampFirstCombCodec extends StringCodec
{
/**
* Encodes a UuidInterface as a string representation of a timestamp first COMB UUID
*
* @param UuidInterface $uuid
*
* @return string Hexadecimal string representation of a GUID
*/
public function encode(UuidInterface $uuid)
{
$sixPieceComponents = array_values($uuid->getFieldsHex());
$this->swapTimestampAndRandomBits($sixPieceComponents);
return vsprintf(
'%08s-%04s-%04s-%02s%02s-%012s',
$sixPieceComponents
);
}
/**
* Encodes a UuidInterface as a binary representation of timestamp first COMB UUID
*
* @param UuidInterface $uuid
*
* @return string Binary string representation of timestamp first COMB UUID
*/
public function encodeBinary(UuidInterface $uuid)
{
$stringEncoding = $this->encode($uuid);
return hex2bin(str_replace('-', '', $stringEncoding));
}
/**
* Decodes a string representation of timestamp first COMB UUID into a UuidInterface object instance
*
* @param string $encodedUuid
*
* @return UuidInterface
* @throws \Ramsey\Uuid\Exception\InvalidUuidStringException
*/
public function decode($encodedUuid)
{
$fivePieceComponents = $this->extractComponents($encodedUuid);
$this->swapTimestampAndRandomBits($fivePieceComponents);
return $this->getBuilder()->build($this, $this->getFields($fivePieceComponents));
}
/**
* Decodes a binary representation of timestamp first COMB UUID into a UuidInterface object instance
*
* @param string $bytes
*
* @return UuidInterface
* @throws \Ramsey\Uuid\Exception\InvalidUuidStringException
*/
public function decodeBytes($bytes)
{
return $this->decode(bin2hex($bytes));
}
/**
* Swaps the first 48 bits with the last 48 bits
*
* @param array $components An array of UUID components (the UUID exploded on its dashes)
*
* @return void
*/
protected function swapTimestampAndRandomBits(array &$components)
{
$last48Bits = $components[4];
if (count($components) == 6) {
$last48Bits = $components[5];
$components[5] = $components[0] . $components[1];
} else {
$components[4] = $components[0] . $components[1];
}
$components[0] = substr($last48Bits, 0, 8);
$components[1] = substr($last48Bits, 8, 4);
}
}
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