/** * Can the advised interfaces be implemented by the introduction advice? * * Invoked before adding an IntroductionAdvisor. * * @return void * @throws \InvalidArgumentException if the advised interfaces can't be implemented by the introduction advice */ public function validateInterfaces() { $refInterface = new ReflectionClass(reset($this->advice->getInterfaces())); $refImplementation = new ReflectionClass(reset($this->advice->getTraits())); if (!$refInterface->isInterface()) { throw new \InvalidArgumentException("Only interface can be introduced"); } if (!$refImplementation->isTrait()) { throw new \InvalidArgumentException("Only trait can be used as implementation"); } foreach ($refInterface->getMethods() as $interfaceMethod) { if (!$refImplementation->hasMethod($interfaceMethod->name)) { throw new \DomainException("Implementation requires method {$interfaceMethod->name}"); } } }