/**
  * Gets all announce entities associated with provided category class
  * 
  * @param string $class Category class
  * @return array
  */
 public function getAllByClass($class)
 {
     $id = $this->categoryMapper->fetchIdByClass($class);
     // Do the following query in case right id supplied
     if ($id) {
         return $this->announceManager->fetchAllPublishedByCategoryId($id);
     } else {
         return array();
     }
 }