public function getRenderer()
{
if (is_null($this->_renderer)) {
$name = ucfirst(strtolower($this->getRendererName()));
$class = 'Mutagenesis\\Renderer\\' . $name;
if (!class_exists($class)) {
throw new \Mutagenesis\FUTException('Invalid Renderer name: ' . strtolower($name));
}
$this->_renderer = new $class();
}
return $this->_renderer;
}