private static function setModelClassMappings()
{
if (static::$modelClassMapping === null) {
static::$modelClassMapping = array();
foreach (static::getModelClasses() as $modelClassName) {
$entity = $modelClassName::$entityType;
$bundle = $modelClassName::$bundle;
if (empty($entity)) {
throw new InvalidTypeException('Entity Type not defined for ' . $modelClassName);
}
$key = Model::getKeyForEntityAndBundle($entity, $bundle);
static::$modelClassMapping[$key] = $modelClassName;
}
}
}
