InheritanceInterceptorScanner.php

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<?php
namespace Magento\Setup\Module\Di\Code\Scanner;

use Magento\Framework\ObjectManager\InterceptableValidator;

class InheritanceInterceptorScanner implements ScannerInterface
{
    private $interceptableValidator;

    public function __construct(InterceptableValidator $interceptableValidator)
    {
        $this->interceptableValidator = $interceptableValidator;
    }

    public function collectEntities(array $classes, array $interceptedEntities = [])
    {
        $output = [];
        foreach ($classes as $class) {
            foreach ($interceptedEntities as $interceptorClass) {
                $interceptedEntity = substr($interceptorClass, 0, -12);
                if (is_subclass_of($class, $interceptedEntity) && $this->interceptableValidator->validate($class)) {
                    $reflectionClass = new \ReflectionClass($class);
                    if (!$reflectionClass->isAbstract() && !$reflectionClass->isFinal()) {
                        $output[] = $class . '\\Interceptor';
                    }
                }
            }
        }
        $output = array_merge($this->filterOutAbstractClasses($interceptedEntities), $output);
        $output = array_unique($output);
        return $output;
    }

    private function filterOutAbstractClasses($interceptedEntities)
    {
        $interceptedEntitiesFiltered = [];
        foreach ($interceptedEntities as $interceptorClass) {
            $interceptedEntity = substr($interceptorClass, 0, -12);
            $reflectionInterceptedEntity = new \ReflectionClass($interceptedEntity);
            if (!$reflectionInterceptedEntity->isAbstract() && !$reflectionInterceptedEntity->isFinal()) {
                $interceptedEntitiesFiltered[] = $interceptorClass;
            }
        }
        return $interceptedEntitiesFiltered;
    }
}