ReadAttributes.php

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<?php
namespace Magento\Framework\EntityManager\Operation\Read;

use Magento\Framework\EntityManager\TypeResolver;
use Magento\Framework\EntityManager\HydratorPool;
use Magento\Framework\EntityManager\Operation\AttributePool;

class ReadAttributes
{
    private $typeResolver;

    private $hydratorPool;

    private $attributePool;

    public function __construct(
        TypeResolver $typeResolver,
        HydratorPool $hydratorPool,
        AttributePool $attributePool
    ) {
        $this->typeResolver = $typeResolver;
        $this->hydratorPool = $hydratorPool;
        $this->attributePool = $attributePool;
    }

    public function execute($entity, $arguments = [])
    {
        $entityType = $this->typeResolver->resolve($entity);
        $hydrator = $this->hydratorPool->getHydrator($entityType);
        $entityData = array_merge($hydrator->extract($entity), $arguments);
        $actions = $this->attributePool->getActions($entityType, 'read');
        foreach ($actions as $action) {
            $entityData = array_merge($entityData, $action->execute($entityType, $entityData, $arguments));
        }
        $entity = $hydrator->hydrate($entity, $entityData);
        return $entity;
    }
}