public function clear(CacheKey $cacheKey = null)
 {
     $baseFolder = $this->getConfigAttribute('BaseFolder');
     $namespace = str_replace('\\', '/', $this->getConfigAttribute('Namespace'));
     // in case we do not have a cache key, remove the entire cache
     if ($cacheKey === null) {
         try {
             FilesystemManager::deleteFolder($baseFolder . '/' . $namespace, true);
             return true;
         } catch (FileException $e) {
             return false;
             // indicate, that nothing was to delete (e.g. cache not active or empty)
         }
     }
     /* @var $cacheKey AdvancedCacheKey */
     $key = $cacheKey->getKey();
     $subKey = $cacheKey->getSubKey();
     if ($key == null && $subKey == null) {
         FilesystemManager::deleteFolder($baseFolder . '/' . $namespace, true);
     } elseif ($key != null && $subKey == null) {
         // in case we have the cache key only, delete the entire structure
         // including all sub cache entries
         $key = md5($key);
         $folder = $baseFolder . '/' . $namespace . '/' . substr($key, 0, 2) . '/' . $key;
         FilesystemManager::deleteFolder($folder, true);
         return true;
     } else {
         // in case we have both cache key and cache sub key, delete the local
         // cache entry structure
         $file = $this->getCacheFile($cacheKey);
         try {
             FilesystemManager::removeFile($file);
             return true;
         } catch (FileException $e) {
             return false;
         }
     }
     return false;
 }
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 public function clear(CacheKey $cacheKey = null)
 {
     $baseFolder = $this->getConfigAttribute('BaseFolder');
     if ($cacheKey === null) {
         return FilesystemManager::deleteFolder($baseFolder, true);
     } else {
         $cacheFile = $this->getCacheFile($cacheKey);
         try {
             return FilesystemManager::removeFile($cacheFile);
         } catch (FileException $e) {
             return false;
         }
     }
 }