ParamConverterManager::convert

public ParamConverterManager::convert(array $defaults)

public function convert(array $defaults) {
  /** @var $route \Symfony\Component\Routing\Route */
  $route = $defaults[RouteObjectInterface::ROUTE_OBJECT];

  // Skip this enhancer if there are no parameter definitions.
  if (!$parameters = $route->getOption('parameters')) {
    return $defaults;
  }

  // Invoke the registered converter for each parameter.
  foreach ($parameters as $name => $definition) {
    if (!isset($defaults[$name])) {
      // Do not try to convert anything that is already set to NULL.
      continue;
    }

    if (!isset($definition['converter'])) {
      // Continue if no converter has been specified.
      continue;
    }

    // If a converter returns NULL it means that the parameter could not be
    // converted.
    $defaults[$name] = $this->getConverter($definition['converter'])->convert($defaults[$name], $definition, $name, $defaults);
    if (!isset($defaults[$name])) {
      throw new ParamNotConvertedException(sprintf('The "%s" parameter was not converted for the path "%s" (route name: "%s")', $name, $route->getPath(), $defaults[RouteObjectInterface::ROUTE_NAME]));
    }
  }

  return $defaults;
}