toJson method
Implementation
Map toJson(){
Map result = {};
if (type != null) result.addAll({"type": type});
if (status != null) result.addAll({"status": status});
if (typeName != null) result.addAll({"typeName": typeName});
if (pageIndex != null) result.addAll({"pageIndex": pageIndex});
if (elements != null) result.addAll({"elements": elements});
return result;
}