public function getValidators($validationGroup = null) { if (!$this->_validators) { $this->_validators = new TList(); } if (empty($validationGroup) === true) { return $this->_validators; } else { $list = new TList(); foreach ($this->_validators as $validator) { if ($validator->getValidationGroup() === $validationGroup) { $list->add($validator); } } return $list; } }