JSONLoader.h

#pragma once 

#include "json/json.h"
#include "JSONLoaderPlugin.h"
#include <fstream>
#include <memory>
#include <stdexcept>
#include <mxx/bcast.hpp>

namespace SSAGES
{

    class JSONLoader
    {
    private:
        std::vector<std::unique_ptr<JSONLoaderPlugin>> plugins_;

    public:

        JSONLoader() : plugins_(0)
        {
            plugins_.push_back(std::unique_ptr<JSONLoaderPlugin>(new IncludePlugin()));
        }


        Json::Value LoadFile(const std::string& filename, const mxx::comm& world)
        {
            std::string contents, path;
            if(world.rank() == 0)
            {
                contents = GetFileContents(filename.c_str());
                path = GetFilePath(filename);
            }
            
            mxx::bcast(contents, 0, world);
            mxx::bcast(path, 0, world);

            for(auto& plugin : plugins_)
                plugin->ApplyFilter(contents, path);

            // Read JSON.
            Json::Reader reader;
            Json::Value root;
            if(!reader.parse(contents, root))
                throw std::invalid_argument(
                    filename + ": " + reader.getFormattedErrorMessages()
                );
            return root;
        }
    };
}