CompositeFieldProvider.php

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<?php
declare(strict_types=1);

namespace Magento\Elasticsearch\Model\Adapter\FieldMapper\Product;

class CompositeFieldProvider implements FieldProviderInterface
{
    private $providers;

    public function __construct(array $providers)
    {
        foreach ($providers as $provider) {
            if (!$provider instanceof FieldProviderInterface) {
                throw new \InvalidArgumentException(
                    sprintf('Instance of the field provider is expected, got %s instead.', get_class($provider))
                );
            }
        }
        $this->providers = $providers;
    }

    public function getFields(array $context = []): array
    {
        $allAttributes = [];

        foreach ($this->providers as $provider) {
            $allAttributes = array_merge($allAttributes, $provider->getFields($context));
        }

        return $allAttributes;
    }
}