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<?php
/*
* This file is part of the Predis package.
*
* (c) Daniele Alessandri <suppakilla@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Predis\Response\Iterator;
use Predis\Response\ResponseInterface;
/**
* Iterator that abstracts the access to multibulk responses allowing them to be
* consumed in a streamable fashion without keeping the whole payload in memory.
*
* This iterator does not support rewinding which means that the iteration, once
* consumed, cannot be restarted.
*
* Always make sure that the whole iteration is consumed (or dropped) to prevent
* protocol desynchronization issues.
*
* @author Daniele Alessandri <suppakilla@gmail.com>
*/
abstract class MultiBulkIterator implements \Iterator, \Countable, ResponseInterface
{
protected $current;
protected $position;
protected $size;
/**
* {@inheritdoc}
*/
public function rewind()
{
// NOOP
}
/**
* {@inheritdoc}
*/
public function current()
{
return $this->current;
}
/**
* {@inheritdoc}
*/
public function key()
{
return $this->position;
}
/**
* {@inheritdoc}
*/
public function next()
{
if (++$this->position < $this->size) {
$this->current = $this->getValue();
}
}
/**
* {@inheritdoc}
*/
public function valid()
{
return $this->position < $this->size;
}
/**
* Returns the number of items comprising the whole multibulk response.
*
* This method should be used instead of iterator_count() to get the size of
* the current multibulk response since the former consumes the iteration to
* count the number of elements, but our iterators do not support rewinding.
*
* @return int
*/
public function count()
{
return $this->size;
}
/**
* Returns the current position of the iterator.
*
* @return int
*/
public function getPosition()
{
return $this->position;
}
/**
* {@inheritdoc}
*/
abstract protected function getValue();
}