GraphMLParser.h

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#pragma once
 
#include <ogdf/basic/HashArray.h>
#include <ogdf/fileformats/GraphIO.h>
 
#include <ogdf/lib/pugixml/pugixml.h>
 
#include <sstream>
#include <unordered_map>
 
namespace ogdf {
 
class GraphMLParser {
private:
    pugi::xml_document m_xml;
    pugi::xml_node m_graphTag; // "Almost root" tag.
 
    // Maps GraphML node id to Graph node.
    std::unordered_map<string, node> m_nodeId;
 
    // Maps attribute id to its name.
    std::unordered_map<string, string> m_attrName;
 
    bool readData(GraphAttributes& GA, const node& v, const pugi::xml_node nodeData);
    bool readData(GraphAttributes& GA, const edge& e, const pugi::xml_node edgeData);
    bool readData(ClusterGraphAttributes& CA, const cluster& c, const pugi::xml_node clusterData);
 
    // Finds all data-keys for given element and calls appropiate "readData".
    template<typename A, typename T>
    bool readAttributes(A& GA, const T& elem, const pugi::xml_node xmlElem) {
        for (pugi::xml_node dataTag : xmlElem.children("data")) {
            const bool result = readData(GA, elem, dataTag);
            if (!result) {
                return false;
            }
        }
 
        return true;
    }
 
    bool readNodes(Graph& G, GraphAttributes* GA, const pugi::xml_node rootTag);
    bool readEdges(Graph& G, GraphAttributes* GA, const pugi::xml_node rootTag);
    bool readClusters(Graph& G, ClusterGraph& C, ClusterGraphAttributes* CA,
            const cluster& rootCluster, const pugi::xml_node clusterRoot);
 
    bool m_error;
 
public:
    explicit GraphMLParser(std::istream& in);
    ~GraphMLParser();
 
    bool read(Graph& G);
    bool read(Graph& G, GraphAttributes& GA);
    bool read(Graph& G, ClusterGraph& C);
    bool read(Graph& G, ClusterGraph& C, ClusterGraphAttributes& CA);
};
 
}