/**
* Creates new Sugar instance if it doesn't already exist, and returns it.
*
* @throws RuntimeException If Sugar lib directory does not exist.
* @return SugarInstance
*/
private function getInstance()
{
if (!self::$sugarInstance) {
if (!is_dir(self::$sugarDirectory)) {
throw new RuntimeException('Cannot set the Sugar lib directory : ' . self::$sugarDirectory . '. Directory does not exist.');
}
require_once self::$sugarDirectory . '/Sugar.php';
self::$sugarInstance = new Sugar();
self::$sugarInstance->templateDir = self::$sugarTemplatesDirectory;
self::$sugarInstance->cacheDir = self::$sugarCacheDirectory;
}
return self::$sugarInstance;
}
