Aggregation.php

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<?php
namespace Magento\Framework\Search\Response;

use Magento\Framework\Api\Search\AggregationInterface;
use Magento\Framework\Api\Search\BucketInterface;

class Aggregation implements AggregationInterface, \IteratorAggregate
{
    protected $buckets;

    public function __construct(array $buckets)
    {
        $this->buckets = $buckets;
    }

    public function getIterator()
    {
        return new \ArrayIterator($this->buckets);
    }

    public function getBucket($bucketName)
    {
        return $this->buckets[$bucketName] ?? null;
    }

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

    public function getBucketNames()
    {
        return array_keys($this->buckets);
    }
}