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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\Response\Iterator;
use InvalidArgumentException;
use OuterIterator;
use ReturnTypeWillChange;
use UnexpectedValueException;
/**
* Outer iterator consuming streamable multibulk responses by yielding tuples of
* keys and values.
*
* This wrapper is useful for responses to commands such as `HGETALL` that can
* be iterator as $key => $value pairs.
*/
class MultiBulkTuple extends MultiBulk implements OuterIterator
{
private $iterator;
/**
* @param MultiBulk $iterator Inner multibulk response iterator.
*/
public function __construct(MultiBulk $iterator)
{
$this->checkPreconditions($iterator);
$this->size = count($iterator) / 2;
$this->iterator = $iterator;
$this->position = $iterator->getPosition();
$this->current = $this->size > 0 ? $this->getValue() : null;
}
/**
* Checks for valid preconditions.
*
* @param MultiBulk $iterator Inner multibulk response iterator.
*
* @throws InvalidArgumentException
* @throws UnexpectedValueException
*/
protected function checkPreconditions(MultiBulk $iterator)
{
if ($iterator->getPosition() !== 0) {
throw new InvalidArgumentException(
'Cannot initialize a tuple iterator using an already initiated iterator.'
);
}
if (($size = count($iterator)) % 2 !== 0) {
throw new UnexpectedValueException('Invalid response size for a tuple iterator.');
}
}
/**
* {@inheritdoc}
*/
#[ReturnTypeWillChange]
public function getInnerIterator()
{
return $this->iterator;
}
/**
* {@inheritdoc}
*/
public function __destruct()
{
$this->iterator->drop(true);
}
/**
* {@inheritdoc}
*/
protected function getValue()
{
$k = $this->iterator->current();
$this->iterator->next();
$v = $this->iterator->current();
$this->iterator->next();
return [$k, $v];
}
}
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