<?php
namespace Guzzle\Iterator;
/**
* Pulls out chunks from an inner iterator and yields the chunks as arrays
*/
class ChunkedIterator extends \IteratorIterator
{
/** @var int Size of each chunk */
protected $chunkSize;
/** @var array Current chunk */
protected $chunk;
/**
* @param \Traversable $iterator Traversable iterator
* @param int $chunkSize Size to make each chunk
* @throws \InvalidArgumentException
*/
public function __construct(\Traversable $iterator, $chunkSize)
{
$chunkSize = (int) $chunkSize;
if ($chunkSize < 0 ) {
throw new \InvalidArgumentException("The chunk size must be equal or greater than zero; $chunkSize given");
}
parent::__construct($iterator);
$this->chunkSize = $chunkSize;
}
public function rewind()
{
parent::rewind();
$this->next();
}
public function next()
{
$this->chunk = array();
for ($i = 0; $i < $this->chunkSize && parent::valid(); $i++) {
$this->chunk[] = parent::current();
parent::next();
}
}
public function current()
{
return $this->chunk;
}
public function valid()
{
return (bool) $this->chunk;
}
}