geom_provider.h

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/*
 * Copyright (c) 2013-2015:  G-CSC, Goethe University Frankfurt
 * Author: Andreas Vogel
 * 
 * This file is part of UG4.
 * 
 * UG4 is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License version 3 (as published by the
 * Free Software Foundation) with the following additional attribution
 * requirements (according to LGPL/GPL v3 §7):
 * 
 * (1) The following notice must be displayed in the Appropriate Legal Notices
 * of covered and combined works: "Based on UG4 (www.ug4.org/license)".
 * 
 * (2) The following notice must be displayed at a prominent place in the
 * terminal output of covered works: "Based on UG4 (www.ug4.org/license)".
 * 
 * (3) The following bibliography is recommended for citation and must be
 * preserved in all covered files:
 * "Reiter, S., Vogel, A., Heppner, I., Rupp, M., and Wittum, G. A massively
 *   parallel geometric multigrid solver on hierarchically distributed grids.
 *   Computing and visualization in science 16, 4 (2013), 151-164"
 * "Vogel, A., Reiter, S., Rupp, M., Nägel, A., and Wittum, G. UG4 -- a novel
 *   flexible software system for simulating pde based models on high performance
 *   computers. Computing and visualization in science 16, 4 (2013), 165-179"
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 */
 
#ifndef __H__UG__LIB_DISC__SPATIAL_DISC__DISC_UTIL__GEOM_PROVIDER__
#define __H__UG__LIB_DISC__SPATIAL_DISC__DISC_UTIL__GEOM_PROVIDER__
 
#include <map>
#include "lib_disc/local_finite_element/local_finite_element_id.h"
 
namespace ug{
 
 
 
template <typename TGeom>
class GeomProvider
{
  public:
 
    static const bool staticLocalData = TGeom::staticLocalData;
 
  protected:
    GeomProvider() {m_mLFEIDandOrder.clear();}
 
    ~GeomProvider() {clear_geoms();}
 
    static GeomProvider<TGeom>& inst() {
      static GeomProvider<TGeom> inst;
      return inst;
    }
 
    struct LFEIDandQuadOrder{
        LFEIDandQuadOrder(const LFEID lfeID, const int order)
        : m_lfeID(lfeID), m_order(order) {}
 
        bool operator<(const LFEIDandQuadOrder& v) const
        {
          if(m_lfeID != v.m_lfeID) return m_lfeID < v.m_lfeID;
          else return m_order < v.m_order;
        }
 
      const LFEID m_lfeID;
      const int m_order;
    };
 
    typedef std::map<LFEIDandQuadOrder, TGeom*> MapType;
    static MapType m_mLFEIDandOrder;
 
    static TGeom& get_class(const LFEID lfeID, const int quadOrder) {
 
      LFEIDandQuadOrder key(lfeID, quadOrder);
 
      typedef std::pair<typename MapType::iterator,bool> ret_type;
      ret_type ret = m_mLFEIDandOrder.insert(std::pair<LFEIDandQuadOrder,TGeom*>(key,NULL));
 
      // newly inserted, need construction of data
      if(ret.second == true){
        if(ret.first->second != NULL){
          UG_THROW("Newly inserted element must have Pointer = NULL");
        }
        else{
          ret.first->second = new TGeom();
        }
      }
 
      return *ret.first->second;
    }
 
    static void clear_geoms(){
      typedef typename std::map<LFEIDandQuadOrder, TGeom*>::iterator MapIter;
      for(MapIter iter = m_mLFEIDandOrder.begin(); iter != m_mLFEIDandOrder.end(); ++iter)
        if(iter->second)
          delete iter->second;
 
      m_mLFEIDandOrder.clear();
    }
 
  public:
    typedef TGeom Type;
 
    static inline TGeom& get(const LFEID lfeID, const int quadOrder){
      // in case of static data, use only one object
      if(staticLocalData) return get();
 
      // return the object based on identifier
      return inst().get_class(lfeID, quadOrder);
    }
 
    static inline TGeom& get(){
      static TGeom inst;
      if(!staticLocalData)
        UG_THROW("GeomProvider: accessing geometry without keys, but"
             " geometry may change local data. Use access by keys instead.");
      return inst;
    }
 
    static inline void clear(){
      inst().clear_geoms();
    }
};
 
template <typename TGeom>
std::map<typename GeomProvider<TGeom>::LFEIDandQuadOrder, TGeom*> GeomProvider<TGeom>::m_mLFEIDandOrder
            = std::map<typename GeomProvider<TGeom>::LFEIDandQuadOrder, TGeom*>();
 
 
} // end namespace ug
 
#endif /* __H__UG__LIB_DISC__SPATIAL_DISC__DISC_UTIL__GEOM_PROVIDER__ */