/**
  * Validates a NS record
  *
  * @param Records    $record
  *
  * @return bool
  */
 public function _validateNs(Records $record)
 {
     $name = $record->getName();
     $target = $record->getContent();
     if (0 != strlen($record->getName())) {
         if (!$this->_checkHostname($name . '.' . $record->getDomain()->getName(), true, $record->getLooseCheck())) {
             $this->context->addViolationAt('name', 'Value: ' . $name . ' is not a valid hostname or ip address', array(), null);
         }
     }
     if (!$this->_checkHostname($target, true)) {
         $this->context->addViolationAt('content', 'Value: ' . $target . ' is not a valid hostname or ip address', array(), null);
     }
     $options = array('options' => array('min_range' => 1, 'max_range' => 99999));
     // We don't force a priority for NS
     // But if there, we check if it is valid
     if (0 != strlen($record->getPrio()) && !filter_var($record->getPrio(), FILTER_VALIDATE_INT, $options)) {
         $this->context->addViolationAt('prio', 'Value: ' . $record->getPrio() . ' is not a valid priority', array(), null);
     }
     return true;
 }