GeoNodePath.h

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#ifndef LARCOREALG_GEOMETRY_GEONODEPATH_H
#define LARCOREALG_GEOMETRY_GEONODEPATH_H

// LArSoft libraries
#include "larcorealg/Geometry/LocalTransformation.h"

// ROOT libraries
#include "TGeoNode.h"

// C++ standard library
#include <cstddef> // std::size_t
#include <string>
#include <vector>

namespace geo {

  class GeoNodePath {
  public:
    // FIXME: a better factorization is desirable
    using Entry = GeoNodePathEntry;

    // --- BEGIN Data types ----------------------------------------------------
    using Depth_t = std::size_t;

    // --- END Data types ------------------------------------------------------

    // --- BEGIN Constructors and destructor -----------------------------------
    explicit GeoNodePath(TGeoNode const* topNode);
    // --- END Constructors and destructor -------------------------------------

    // --- BEGIN Query and access ----------------------------------------------
    bool empty() const;

    Depth_t depth() const;

    TGeoNode const* current() const;

    Entry current_entry() const;

    Entry parent_entry() const;

    // --- END Query and access ------------------------------------------------

    // --- BEGIN Content management --------------------------------------------
    void append(TGeoNode const* node);

    void pop();
    // --- END Content management ----------------------------------------------

    template <typename Matrix = TGeoHMatrix>
    Matrix currentTransformation() const;

    operator std::string() const;

  private:
    std::vector<Entry> fNodes; 

  }; // class GeoNodePath

} // namespace geo

//------------------------------------------------------------------------------
//--- template implementation
//------------------------------------------------------------------------------
template <typename Matrix /* = TGeoHMatrix */>
Matrix geo::GeoNodePath::currentTransformation() const
{
  return transformationFromPath<Matrix>(fNodes.begin(), fNodes.end());
}

//------------------------------------------------------------------------------

#endif // LARCOREALG_GEOMETRY_GEONODEPATH_H