public static function get_extra_config_sources($class = null)
{
if ($class === null) {
$class = get_called_class();
}
// If this class is unextendable, NOP
if (in_array($class, self::$unextendable_classes)) {
return null;
}
// Variable to hold sources in
$sources = null;
// Get a list of extensions
$extensions = Config::inst()->get($class, 'extensions', Config::UNINHERITED | Config::EXCLUDE_EXTRA_SOURCES);
if (!$extensions) {
return null;
}
// Build a list of all sources;
$sources = array();
foreach ($extensions as $extension) {
list($extensionClass, $extensionArgs) = Object::parse_class_spec($extension);
$sources[] = $extensionClass;
if (!class_exists($extensionClass)) {
throw new InvalidArgumentException("{$class} references nonexistent {$extensionClass} in \$extensions");
}
call_user_func(array($extensionClass, 'add_to_class'), $class, $extensionClass, $extensionArgs);
foreach (array_reverse(ClassInfo::ancestry($extensionClass)) as $extensionClassParent) {
if (ClassInfo::has_method_from($extensionClassParent, 'get_extra_config', $extensionClassParent)) {
$extras = $extensionClassParent::get_extra_config($class, $extensionClass, $extensionArgs);
if ($extras) {
$sources[] = $extras;
}
}
}
}
return $sources;
}