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<?php
/*
* This file is part of the Predis package.
*
* (c) 2009-2020 Daniele Alessandri
* (c) 2021-2023 Till Krüss
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Predis\Configuration\Option;
use InvalidArgumentException;
use Predis\Cluster\Hash;
use Predis\Configuration\OptionInterface;
use Predis\Configuration\OptionsInterface;
/**
* Configures an hash generator used by the redis-cluster connection backend.
*/
class CRC16 implements OptionInterface
{
/**
* Returns an hash generator instance from a descriptive name.
*
* @param OptionsInterface $options Client options.
* @param string $description Identifier of a hash generator (`predis`, `phpiredis`)
*
* @return callable
*/
protected function getHashGeneratorByDescription(OptionsInterface $options, $description)
{
if ($description === 'predis') {
return new Hash\CRC16();
} elseif ($description === 'phpiredis') {
return new Hash\PhpiredisCRC16();
} else {
throw new InvalidArgumentException(
'String value for the crc16 option must be either `predis` or `phpiredis`'
);
}
}
/**
* {@inheritdoc}
*/
public function filter(OptionsInterface $options, $value)
{
if (is_callable($value)) {
$value = call_user_func($value, $options);
}
if (is_string($value)) {
return $this->getHashGeneratorByDescription($options, $value);
} elseif ($value instanceof Hash\HashGeneratorInterface) {
return $value;
} else {
$class = get_class($this);
throw new InvalidArgumentException("$class expects a valid hash generator");
}
}
/**
* {@inheritdoc}
*/
public function getDefault(OptionsInterface $options)
{
return function_exists('phpiredis_utils_crc16')
? new Hash\PhpiredisCRC16()
: new Hash\CRC16();
}
}