graph_load.hh

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#ifndef UTOPIA_DATAIO_GRAPH_LOAD_HH
#define UTOPIA_DATAIO_GRAPH_LOAD_HH
 
#include <string>
#include <fstream>
#include <boost/graph/graphml.hpp>
#include <boost/graph/graphviz.hpp>
#include <boost/property_map/dynamic_property_map.hpp>
 
#include "utopia/core/types.hh"
#include "utopia/data_io/filesystem.hh"
#include "utopia/data_io/cfg_utils.hh"
 
 
namespace Utopia {
namespace DataIO {
namespace GraphLoad {
 
template <typename Graph>
Graph load_graph(const Config& cfg,
                 boost::dynamic_properties pmaps)
{
    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;
}
 
} // namespace GraphLoad
 
 
} // namespace DataIO
} // namespace Utopia
 
#endif // UTOPIA_DATAIO_GRAPH_LOAD_HH