/**
  * Finds a collection inside this collection
  *
  * @param   string name
  * @return  io.collections.IOCollection
  * @throws  io.OperationNotSupportedException
  * @throws  io.IOException
  */
 public function findCollection($name)
 {
     $qualified = $this->qualifiedName($name);
     if (!is_dir($qualified)) {
         return null;
     }
     $found = new FileCollection($qualified);
     $found->setOrigin($this);
     return $found;
 }