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Viewing: CRC16.php

<?php

/*
 * This file is part of the Predis package.
 *
 * (c) 2009-2020 Daniele Alessandri
 * (c) 2021-2025 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`)
     *
     * @return callable
     */
    protected function getHashGeneratorByDescription(OptionsInterface $options, $description)
    {
        if ($description === 'predis') {
            return new Hash\CRC16();
        } else {
            throw new InvalidArgumentException(
                'String value for the crc16 option must be either `predis`'
            );
        }
    }

    /**
     * {@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 new Hash\CRC16();
    }
}

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Viewing: CRC16.php

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