Json.php

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<?php
namespace Magento\Framework\Controller\Result;

use Magento\Framework\App\Response\HttpInterface as HttpResponseInterface;
use Magento\Framework\Controller\AbstractResult;
use Magento\Framework\Translate\InlineInterface;

class Json extends AbstractResult
{
    protected $translateInline;

    protected $json;

    private $serializer;

    public function __construct(
        InlineInterface $translateInline,
        \Magento\Framework\Serialize\Serializer\Json $serializer = null
    ) {
        $this->translateInline = $translateInline;
        $this->serializer = $serializer ?: \Magento\Framework\App\ObjectManager::getInstance()
            ->get(\Magento\Framework\Serialize\Serializer\Json::class);
    }

    public function setData($data, $cycleCheck = false, $options = [])
    {
        if ($data instanceof \Magento\Framework\DataObject) {
            $data = $data->toArray();
        }
        $this->json = $this->serializer->serialize($data);
        return $this;
    }

    public function setJsonData($jsonData)
    {
        $this->json = (string)$jsonData;
        return $this;
    }

    protected function render(HttpResponseInterface $response)
    {
        $this->translateInline->processResponseBody($this->json, true);
        $response->setHeader('Content-Type', 'application/json', true);
        $response->setBody($this->json);
        return $this;
    }
}