protected function getCustomTransactionOldValue(PhabricatorLiskDAO $object, PhabricatorApplicationTransaction $xaction)
 {
     switch ($xaction->getTransactionType()) {
         case PhabricatorSpacesNamespaceTransaction::TYPE_NAME:
             $name = $object->getNamespaceName();
             if (!strlen($name)) {
                 return null;
             }
             return $name;
         case PhabricatorSpacesNamespaceTransaction::TYPE_DESCRIPTION:
             if ($this->getIsNewObject()) {
                 return null;
             }
             return $object->getDescription();
         case PhabricatorSpacesNamespaceTransaction::TYPE_ARCHIVE:
             return $object->getIsArchived();
         case PhabricatorSpacesNamespaceTransaction::TYPE_DEFAULT:
             return $object->getIsDefaultNamespace() ? 1 : null;
         case PhabricatorTransactions::TYPE_VIEW_POLICY:
             return $object->getViewPolicy();
         case PhabricatorTransactions::TYPE_EDIT_POLICY:
             return $object->getEditPolicy();
     }
     return parent::getCustomTransactionOldValue($object, $xaction);
 }
 protected function getCustomTransactionOldValue(PhabricatorLiskDAO $object, PhabricatorApplicationTransaction $xaction)
 {
     switch ($xaction->getTransactionType()) {
         case PhabricatorDashboardPanelTransaction::TYPE_NAME:
             if ($this->getIsNewObject()) {
                 return null;
             }
             return $object->getName();
         case PhabricatorDashboardPanelTransaction::TYPE_ARCHIVE:
             return (int) $object->getIsArchived();
     }
     return parent::getCustomTransactionOldValue($object, $xaction);
 }