get_analysis.cc
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get_analysis.cc
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	/**
	* \authors The HEJ collaboration (see AUTHORS for details)
	* \date 2019
	* \copyright GPLv2 or later
	*/
	#include "HEJ/get_analysis.hh"

	#include <dlfcn.h>
	#include <string>

	#include "yaml-cpp/yaml.h"

	#include "HEJ/EmptyAnalysis.hh"
	#include "HEJ/RivetAnalysis.hh"

	namespace HEJ{

	std::unique_ptr<Analysis> get_analysis(YAML::Node const & parameters){
	if(!parameters["plugin"]){
	if(parameters["rivet"])
	return RivetAnalysis::create(parameters);
	return EmptyAnalysis::create(parameters);
	}

	using AnalysisMaker = std::unique_ptr<Analysis> (*)(YAML::Node);
	const auto plugin_name = parameters["plugin"].as<std::string>();
	auto handle = dlopen(plugin_name.c_str(), RTLD_NOW);
	char * error = dlerror();
	if(error != nullptr) throw std::runtime_error(error);

	void * sym = dlsym(handle, "make_analysis");
	error = dlerror();
	if(error != nullptr) throw std::runtime_error(error);
	auto make_analysis = reinterpret_cast<AnalysisMaker>(sym);

	return make_analysis(parameters);
	}
	}