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);
                path = GetFilePath(filename);
            }
            
            mxx::bcast(contents, 0, world);
            mxx::bcast(path, 0, world);
 
            for(auto& plugin : plugins_)
                plugin->ApplyFilter(contents, path);
 
            // Read JSON.
            Json::Value root;
            std::string errors;
            Json::CharReaderBuilder rbuilder;
            Json::CharReader* reader = rbuilder.newCharReader();
            if(!reader->parse(contents.c_str(), contents.c_str() + contents.size(), &root, &errors))
            {
                throw std::invalid_argument(
                    filename + ": " + errors
                );
            }
            delete reader;
            return root;
        }
    };
}