Poco :: JSON :: Object的深层副本

Question

I'm trying to create deep copy of Poco::JSON::Object .

Internally Poco::JSON::Object uses pointers and copy constructor just copy those pointers. Is there a clever solution how to copy this structure using Poco framework?

Answer 1

I don't know of any generic solution, but for small JSON objects where performance is not critical the following function does the job well enough:

Poco::JSON::Object::Ptr cloneJsonObject(Poco::JSON::Object::Ptr obj) {
    if (obj) {
        std::stringstream streamedObj;
        obj->stringify(streamedObj);
        Poco::JSON::Parser parser;
        return parser.parse(streamedObj).extract<Poco::JSON::Object::Ptr>();
    } else {
        return nullptr;
    }
}

Answer 2

could not find good documentation. so here is another way of copying. you can check if the key and value need further deeper copy like using c_str(). for me this works fine.

Poco::JSON::Object::Ptr cloneJsonObject(Poco::JSON::Object::Ptr obj)
{
    Poco::JSON::Object::Iterator it;
    Poco::JSON::Object *ptr = new Poco::JSON::Object;
    // loop and copy
    for(it = obj->begin(); it != obj->end(); it++)
        ptr->set(it->first, it->second);

    return ptr;
}