Method route

/**
 * Route the application.
 *
 * Routing is the process of examining the request environment to determine which
 * component should receive the request. The component optional parameters
 * are then set in the request object to be processed when the application is being
 * dispatched.
 *
 * @return  void
 *
 * @since   4.0.0
 */
protected function route()
{
    $router = $this->getApiRouter();
    // Trigger the onBeforeApiRoute event.
    PluginHelper::importPlugin('webservices');
    $this->triggerEvent('onBeforeApiRoute', array(&$router, $this));
    $caught404 = false;
    $method = $this->input->getMethod();
    try {
        $this->handlePreflight($method, $router);
        $route = $router->parseApiRoute($method);
    } catch (RouteNotFoundException $e) {
        $caught404 = true;
    }
    /**
     * Now we have an API perform content negotiation to ensure we have a valid header. Assume if the route doesn't
     * tell us otherwise it uses the plain JSON API
     */
    $priorities = array('application/vnd.api+json');
    if (!$caught404 && \array_key_exists('format', $route['vars'])) {
        $priorities = $route['vars']['format'];
    }
    $negotiator = new Negotiator();
    try {
        $mediaType = $negotiator->getBest($this->input->server->getString('HTTP_ACCEPT'), $priorities);
    } catch (InvalidArgument $e) {
        $mediaType = null;
    }
    // If we can't find a match bail with a 406 - Not Acceptable
    if ($mediaType === null) {
        throw new Exception\NotAcceptable('Could not match accept header', 406);
    }
    /** @var $mediaType Accept */
    $format = $mediaType->getValue();
    if (\array_key_exists($mediaType->getValue(), $this->formatMapper)) {
        $format = $this->formatMapper[$mediaType->getValue()];
    }
    $this->input->set('format', $format);
    if ($caught404) {
        throw $e;
    }
    $this->input->set('option', $route['vars']['component']);
    $this->input->set('controller', $route['controller']);
    $this->input->set('task', $route['task']);
    foreach ($route['vars'] as $key => $value) {
        if ($key !== 'component') {
            if ($this->input->getMethod() === 'POST') {
                $this->input->post->set($key, $value);
            } else {
                $this->input->set($key, $value);
            }
        }
    }
    $this->triggerEvent('onAfterApiRoute', array($this));
    if (!isset($route['vars']['public']) || $route['vars']['public'] === false) {
        if (!$this->login(array('username' => ''), array('silent' => true, 'action' => 'core.login.api'))) {
            throw new AuthenticationFailed();
        }
    }
}