ProductDataProvider.php

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<?php
namespace Magento\Catalog\Ui\DataProvider\Product\Form;

use Magento\Catalog\Model\ResourceModel\Product\CollectionFactory;
use Magento\Ui\DataProvider\AbstractDataProvider;
use Magento\Ui\DataProvider\Modifier\ModifierInterface;
use Magento\Ui\DataProvider\Modifier\PoolInterface;

class ProductDataProvider extends AbstractDataProvider
{
    private $pool;

    public function __construct(
        $name,
        $primaryFieldName,
        $requestFieldName,
        CollectionFactory $collectionFactory,
        PoolInterface $pool,
        array $meta = [],
        array $data = []
    ) {
        parent::__construct($name, $primaryFieldName, $requestFieldName, $meta, $data);
        $this->collection = $collectionFactory->create();
        $this->pool = $pool;
    }

    public function getData()
    {
        foreach ($this->pool->getModifiersInstances() as $modifier) {
            $this->data = $modifier->modifyData($this->data);
        }

        return $this->data;
    }

    public function getMeta()
    {
        $meta = parent::getMeta();

        foreach ($this->pool->getModifiersInstances() as $modifier) {
            $meta = $modifier->modifyMeta($meta);
        }

        return $meta;
    }
}