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