/**
* Check if an alias is registered
*
* @param Model $objModel The model object
* @param string $strAlias The alias name
* @param mixed $varValue The value of the alias
*
* @return boolean True if the alias is registered
*/
public function isRegisteredAlias(Model $objModel, $strAlias, $varValue)
{
$strTable = $objModel->getTable();
return isset($this->arrAliases[$strTable][$strAlias][$varValue]);
}