/**
  * Unlock object for comments
  * 
  * @param void
  * @return null
  */
 function unlock()
 {
     if (!$this->active_object->can_have_comments) {
         $this->httpError(HTTP_ERR_NOT_FOUND, null, true, $this->request->isApiCall());
     }
     // if
     if (!$this->active_object->canChangeLockedState($this->logged_user)) {
         $this->httpError(HTTP_ERR_FORBIDDEN, null, true, $this->request->isApiCall());
     }
     // if
     $this->executeOnActiveObject('unlock', array($this->logged_user), lang(':type ":name" has been unlocked', array('type' => $this->active_object->getVerboseType(), 'name' => $this->active_object->getName())), lang('Failed to unlock :type ":name"', array('type' => $this->active_object->getVerboseType(true), 'name' => $this->active_object->getName())));
 }