public function fillDefaultsByPackageName($packageName)
{
$extensionKey = ExtensionNamingUtility::getExtensionKey($packageName);
$extensionPath = ExtensionManagementUtility::extPath($extensionKey);
$this->setTemplateRootPaths(array($extensionPath . self::DEFAULT_TEMPLATES_DIRECTORY));
$this->setLayoutRootPaths(array($extensionPath . self::DEFAULT_LAYOUTS_DIRECTORY));
$this->setPartialRootPaths(array($extensionPath . self::DEFAULT_PARTIALS_DIRECTORY));
}