Matthias\SymfonyServiceDefinitionValidator\ConstructorResolver::resolveFactoryClassWithMethod PHP Method

    private function resolveFactoryClassWithMethod($factoryClass, $factoryMethod)
    {
        $factoryClass = $this->resolvePlaceholders($factoryClass);
        if (!class_exists($factoryClass)) {
            throw new ClassNotFoundException($factoryClass);
        }
        if (!method_exists($factoryClass, $factoryMethod)) {
            throw new MethodNotFoundException($factoryClass, $factoryMethod);
        }
        $reflectionMethod = new \ReflectionMethod($factoryClass, $factoryMethod);
        if (!$reflectionMethod->isStatic()) {
            throw new NonStaticFactoryMethodException($factoryClass, $factoryMethod);
        }
        return $reflectionMethod;
    }