toJson method
Implementation
@override
Map toJson() {
Map<String, dynamic> map = {'url': url, 'type': type, 'mimeType': mimeType};
if (lastModified != null) map['lastModified'] = lastModified;
if (contentSize != null) map['contentSize'] = contentSize;
if (failed != null) map['failed'] = failed;
if (canceled != null) map['canceled'] = canceled;
return map;
}