Method getInstance

/**
 * Returns the global Router object, only creating it if it
 * doesn't already exist.
 *
 * @param   string  $client   The name of the client
 * @param   array   $options  An associative array of options
 *
 * @return  Router  A Router object.
 *
 * @since   1.5
 * @throws  \RuntimeException
 */
public static function getInstance($client, $options = array())
{
    if (empty(self::$instances[$client])) {
        // Create a Router object
        $classname = 'JRouter' . ucfirst($client);
        if (!class_exists($classname)) {
            throw new \RuntimeException(Text::sprintf('JLIB_APPLICATION_ERROR_ROUTER_LOAD', $client), 500);
        }
        // Check for a possible service from the container otherwise manually instantiate the class
        if (Factory::getContainer()->has($classname)) {
            self::$instances[$client] = Factory::getContainer()->get($classname);
        } else {
            self::$instances[$client] = new $classname();
        }
    }
    return self::$instances[$client];
}