/**
* {@inheritdoc}
*/
protected function execute(InputInterface $input, OutputInterface $output)
{
if (class_exists('Symfony\\Component\\Config\\Definition\\Dumper\\YamlReferenceDumper')) {
$dumper = new YamlReferenceDumper();
} else {
// Support Symfony Config 2.3
$dumper = new ReferenceDumper();
}
$configTree = new ConfigurationTree();
$output->writeln($dumper->dumpNode($configTree->getConfigTree($this->extensionManager->getExtensions())));
}