/**
  * Internally called method to assist with early binding of objects
  * on load methods.  Can only early-bind references that this class owns in the database.
  * @param string $strParentAlias the alias of the parent (if any)
  * @param string $strAlias the alias of this object
  * @param array $objExpansionMap map of referenced columns to be immediately expanded via early-binding
  * @param QueryExpansion an already instantiated QueryExpansion object (used as a utility object to assist with object expansion)
  */
 public static function ExpandQuery($strParentAlias, $strAlias, $objExpansionMap, QQueryExpansion $objQueryExpansion)
 {
     if ($strAlias) {
         $objQueryExpansion->AddFromItem(sprintf('LEFT JOIN `class_property` AS `%s__%s` ON `%s`.`%s` = `%s__%s`.`id`', $strParentAlias, $strAlias, $strParentAlias, $strAlias, $strParentAlias, $strAlias));
         $objQueryExpansion->AddSelectItem(sprintf('`%s__%s`.`id` AS `%s__%s__id`', $strParentAlias, $strAlias, $strParentAlias, $strAlias));
         $objQueryExpansion->AddSelectItem(sprintf('`%s__%s`.`qcodo_class_id` AS `%s__%s__qcodo_class_id`', $strParentAlias, $strAlias, $strParentAlias, $strAlias));
         $objQueryExpansion->AddSelectItem(sprintf('`%s__%s`.`variable_group_id` AS `%s__%s__variable_group_id`', $strParentAlias, $strAlias, $strParentAlias, $strAlias));
         $objQueryExpansion->AddSelectItem(sprintf('`%s__%s`.`variable_id` AS `%s__%s__variable_id`', $strParentAlias, $strAlias, $strParentAlias, $strAlias));
         $objQueryExpansion->AddSelectItem(sprintf('`%s__%s`.`class_variable_id` AS `%s__%s__class_variable_id`', $strParentAlias, $strAlias, $strParentAlias, $strAlias));
         $objQueryExpansion->AddSelectItem(sprintf('`%s__%s`.`read_only_flag` AS `%s__%s__read_only_flag`', $strParentAlias, $strAlias, $strParentAlias, $strAlias));
         $objQueryExpansion->AddSelectItem(sprintf('`%s__%s`.`write_only_flag` AS `%s__%s__write_only_flag`', $strParentAlias, $strAlias, $strParentAlias, $strAlias));
         $strParentAlias = $strParentAlias . '__' . $strAlias;
     }
     if (is_array($objExpansionMap)) {
         foreach ($objExpansionMap as $strKey => $objValue) {
             switch ($strKey) {
                 case 'qcodo_class_id':
                     try {
                         QcodoClass::ExpandQuery($strParentAlias, $strKey, $objValue, $objQueryExpansion);
                         break;
                     } catch (QCallerException $objExc) {
                         $objExc->IncrementOffset();
                         throw $objExc;
                     }
                 case 'variable_group_id':
                     try {
                         VariableGroup::ExpandQuery($strParentAlias, $strKey, $objValue, $objQueryExpansion);
                         break;
                     } catch (QCallerException $objExc) {
                         $objExc->IncrementOffset();
                         throw $objExc;
                     }
                 case 'variable_id':
                     try {
                         Variable::ExpandQuery($strParentAlias, $strKey, $objValue, $objQueryExpansion);
                         break;
                     } catch (QCallerException $objExc) {
                         $objExc->IncrementOffset();
                         throw $objExc;
                     }
                 case 'class_variable_id':
                     try {
                         ClassVariable::ExpandQuery($strParentAlias, $strKey, $objValue, $objQueryExpansion);
                         break;
                     } catch (QCallerException $objExc) {
                         $objExc->IncrementOffset();
                         throw $objExc;
                     }
                 default:
                     throw new QCallerException(sprintf('Unknown Object to Expand in %s: %s', $strParentAlias, $strKey));
             }
         }
     }
 }