Utopia::DataIO::GraphLoad Namespace Reference

Functions
template<typename Graph >
Graph	load_graph (const Config &cfg, boost::dynamic_properties pmaps)
	Load a graph.

Function Documentation

load_graph()

template<typename Graph >

Graph Utopia::DataIO::GraphLoad::load_graph	(	const Config &	cfg,
		boost::dynamic_properties	pmaps
	)

Load a graph.

This function loads a graph

/tparam Graph The graph type

/param file_name The name of the file to load /param pmaps Any additional property maps; if this contains a property map named weight, the weights will be loaded additionally, if the data file contains that information.

/return Graph The loaded graph

{
    const auto abs_file_path = get_abs_filepath(cfg);
    const auto format = get_as<std::string>("format", cfg, "dot");
 
    // Create an empty graph
    Graph g;
 
    // Load file into file stream
    std::ifstream ifs(abs_file_path.c_str());
    if (not ifs.is_open()) {
        throw std::invalid_argument(
            "Failed opening file for loading graph! Make sure there "
            "exists a file at " + abs_file_path + "!"
        );
    }
 
    // Load the data from the file stream
    if (format == "graphviz" or format == "gv" or format == "dot") {
        boost::read_graphviz(ifs, g, pmaps);
 
    } else if (format == "graphml") {
        boost::read_graphml(ifs, g, pmaps);
 
    } else {
        throw std::invalid_argument(
            "The given file format is not supported. The file format needs "
            "to be one of 'graphviz' / 'gv' / 'dot' or 'graphml' "
            "and needs to be specified in the config's format node, e.g. "
            "load_from_file: { format: graphml }.");
    }
 
    // Return the graph
    return g;
}