/**
* Get Departments
*
* Obtain a list of departments for use in limiting the reserves list.
*
* @return array An associative array with key = dept. ID, value = dept. name.
* @access public
*/
public function getDepartments()
{
// Graceful degradation -- return empty list if no method supported.
return method_exists($this->driver, 'getDepartments') ? $this->driver->getDepartments() : array();
}