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<?php
namespace Stripe\Util;
class AutoPagingIterator implements \Iterator
{
private $lastId = null;
private $page = null;
private $pageOffset = 0;
private $params = [];
public function __construct($collection, $params)
{
$this->page = $collection;
$this->params = $params;
}
public function rewind()
{
// Actually rewinding would require making a copy of the original page.
}
public function current()
{
$item = current($this->page->data);
$this->lastId = $item !== false ? $item['id'] : null;
return $item;
}
public function key()
{
return key($this->page->data) + $this->pageOffset;
}
public function next()
{
$item = next($this->page->data);
if ($item === false) {
// If we've run out of data on the current page, try to fetch another one
// and increase the offset the new page would start at
$this->pageOffset += count($this->page->data);
if ($this->page['has_more']) {
$this->params = array_merge(
$this->params ?: [],
['starting_after' => $this->lastId]
);
$this->page = $this->page->all($this->params);
} else {
return false;
}
}
}
public function valid()
{
$key = key($this->page->data);
$valid = ($key !== null && $key !== false);
return $valid;
}
}