}
// ����û��ָ��mapping��engine��ȡ����Ĭ�Ϻ�
for (Map.Entry<String, TemplateEngine> entry : engines.entrySet()) {
String engineName = entry.getKey();
TemplateEngine engine = entry.getValue();
if (!remappedNames.contains(engineName)) {
String[] exts = engine.getDefaultExtensions();
for (String ext : exts) {
ext = normalizeExtension(ext);
assertNotNull(ext, "default extensions for engine: %s", engine);