How does \Magento\Framework\Api\ExtensionAttributesFactory::create() work?

dmitry_fedyuk · April 30, 2016, 1:37pm

Context: How does \Magento\Catalog\Model\Product.php::getExtensionAttributes() work?

magento/magento2/blob/958164/lib/internal/Magento/Framework/Api/ExtensionAttributesFactory.php#L40-L47


/**
 * Create extension attributes object, custom for each extensible class.
 *
 * @param string $extensibleClassName
 * @param array $data
 * @return object
 */
public function create($extensibleClassName, $data = [])

github.com

magento/magento2/blob/958164/lib/internal/Magento/Framework/Api/ExtensionAttributesFactory.php#L49-L60


$interfaceReflection = new \ReflectionClass($this->getExtensibleInterfaceName($extensibleClassName));


$methodReflection = $interfaceReflection->getMethod('getExtensionAttributes');
if ($methodReflection->getDeclaringClass() == self::EXTENSIBLE_INTERFACE_NAME) {
    throw new \LogicException(
        "Method 'getExtensionAttributes' must be overridden in the interfaces "
        . "which extend '" . self::EXTENSIBLE_INTERFACE_NAME . "'. "
        . "Concrete return type should be specified."
    );
}


$interfaceName = '\\' . $interfaceReflection->getName();

github.com

magento/magento2/blob/958164/lib/internal/Magento/Framework/Api/ExtensionAttributesFactory.php#L61-L61


$extensionClassName = substr($interfaceName, 0, -strlen('Interface')) . 'Extension';

github.com

magento/magento2/blob/958164/lib/internal/Magento/Framework/Api/ExtensionAttributesFactory.php#L62-L62


$extensionInterfaceName = $extensionClassName . 'Interface';

github.com

magento/magento2/blob/958164/lib/internal/Magento/Framework/Api/ExtensionAttributesFactory.php#L64-L65


/** Ensure that proper return type of getExtensionAttributes() method is specified */
$methodDocBlock = $methodReflection->getDocComment();

github.com

magento/magento2/blob/958164/app/code/Magento/Catalog/Api/Data/ProductInterface.php#L205-L209


/**
 * Retrieve existing extension attributes object or create a new one.
 *
 * @return \Magento\Catalog\Api\Data\ProductExtensionInterface|null
 */

github.com

magento/magento2/blob/958164/lib/internal/Magento/Framework/Api/ExtensionAttributesFactory.php#L66-L73


$pattern = "/@return\s+" . str_replace('\\', '\\\\', $extensionInterfaceName) . "/";
if (!preg_match($pattern, $methodDocBlock)) {
    throw new \LogicException(
        "Method 'getExtensionAttributes' must be overridden in the interfaces "
        . "which extend '" . self::EXTENSIBLE_INTERFACE_NAME . "'. "
        . "Concrete return type must be specified. Please fix :" . $interfaceName
    );
}

github.com

magento/magento2/blob/958164/lib/internal/Magento/Framework/Api/ExtensionAttributesFactory.php#L75-L75


$extensionFactoryName = $extensionClassName . 'Factory';

github.com

magento/magento2/blob/958164/lib/internal/Magento/Framework/Api/ExtensionAttributesFactory.php#L76-L77


$extensionFactory = $this->objectManager->create($extensionFactoryName);
return $extensionFactory->create($data);