private function generateEmptyCode(EntityPackageBuilder $graph)
    {
        foreach ($graph->getEntityPackages() as $entity_package) {
            /* @var $entity_package EntityPackage */
            $this->writeIfVerbose(
                '    - Preparing package <info>' . $entity_package->getPackage()
                    ->getName() . '</info>'
            );
            foreach ($entity_package->getEntityContent()->getClasses() as $entity) {
                $this->writeIfVeryVerbose(
                    '        - Generating empty interface for <info>' . $entity->getName() . '</info>'
                );
                $this->empty_generator->generate($entity);
            }
        }
    }