SearchResultIterator.php

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<?php
namespace Magento\Framework\Data;

use Magento\Framework\DB\QueryInterface;

class SearchResultIterator implements \Iterator
{
    protected $searchResult;

    protected $query;

    protected $current;

    protected $key = 0;

    public function __construct(AbstractSearchResult $searchResult, QueryInterface $query)
    {
        $this->searchResult = $searchResult;
        $this->query = $query;
    }

    public function current()
    {
        return $this->current;
    }

    public function next()
    {
        ++$this->key;
        $this->current = $this->searchResult->createDataObject($this->query->fetchItem());
    }

    public function key()
    {
        return $this->key;
    }

    public function valid()
    {
        return !empty($this->current);
    }

    public function rewind()
    {
        $this->current = null;
        $this->key = 0;
        $this->query->reset();
        $this->next();
    }
}