vendor/stripe/stripe-php/lib/Util/AutoPagingIterator.php

   1 <?php
   2
   3 namespace Stripe\Util;
   4
   5 class AutoPagingIterator implements \Iterator
   6 {
   7     private $lastId = null;
   8     private $page = null;
   9     private $pageOffset = 0;
  10     private $params = [];
  11
  12     public function __construct($collection, $params)
  13     {
  14         $this->page = $collection;
  15         $this->params = $params;
  16     }
  17
  18     public function rewind()
  19     {
  20         // Actually rewinding would require making a copy of the original page.
  21     }
  22
  23     public function current()
  24     {
  25         $item = current($this->page->data);
  26         $this->lastId = $item !== false ? $item['id'] : null;
  27
  28         return $item;
  29     }
  30
  31     public function key()
  32     {
  33         return key($this->page->data) + $this->pageOffset;
  34     }
  35
  36     public function next()
  37     {
  38         $item = next($this->page->data);
  39         if ($item === false) {
  40             // If we've run out of data on the current page, try to fetch another one
  41             // and increase the offset the new page would start at
  42             $this->pageOffset += count($this->page->data);
  43             if ($this->page['has_more']) {
  44                 $this->params = array_merge(
  45                     $this->params ?: [],
  46                     ['starting_after' => $this->lastId]
  47                 );
  48                 $this->page = $this->page->all($this->params);
  49             } else {
  50                 return false;
  51             }
  52         }
  53     }
  54
  55     public function valid()
  56     {
  57         $key = key($this->page->data);
  58         $valid = ($key !== null && $key !== false);
  59         return $valid;
  60     }
  61 }