ExpressionArray.hpp

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// This file is part of GranOO, a workbench for DEM simulation.
//
// Author(s)    : - Damien Andre       IRCER/UNILIM, Limoges France
//                  <damien.andre@unilim.fr>
//                - Jean-luc Charles   Arts et Metiers ParisTech, CNRS, I2M, Bordeaux France
//                  <jean-luc.charles@ensam.eu>
//                - Jeremie Girardot   Arts et Metiers ParisTech, CNRS, I2M, Bordeaux France
//                  <jeremie.girardot@ensam.eu>
//                - Cedric Hubert      LAMIH/UPHF, Valenciennes France
//                  <cedric.hubert@uphf.fr>
//                - Ivan Iordanoff     Arts et Metiers ParisTech, CNRS, I2M, Bordeaux France
//                  <ivan.iordanoff@ensam.eu>
//
// Copyright (C) 2008-2019 D. Andre, JL. Charles, J. Girardot, C. Hubert, I. Iordanoff
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
 
#ifndef GranOO_Math_ExpressionArray_hpp
#define GranOO_Math_ExpressionArray_hpp
 
 
#include <string>
#include <boost/assign.hpp>
 
#include "GranOO3/Math/Expression.hpp"
 
#include "GranOO3/Core/XmlObjectManager.hpp"
#include "GranOO3/Core/XmlParser.hpp"
 
 
namespace GranOO3
{
  namespace Math
  {
 
    template<int N>
    class ExpressionArray
    {
 
    public:
      ExpressionArray(const std::string& l1, const std::string& l2, const std::string& l3);
      ExpressionArray(const std::string& l1, const std::string& l2, const std::string& l3, const std::string& l4);
      ExpressionArray(const std::string& l1, const std::string& l2, const std::string& l3, const std::string& l4, const std::string& l5);
      ExpressionArray(const std::string& l1, const std::string& l2, const std::string& l3, const std::string& l4, const std::string& l5, const std::string& l6);
 
      void parse_xml();
      bool expression_exist(const std::string& l) const;
      double value(const std::string& l);
      double value(const std::string& l) const;
 
 
      Expression& get_expression(const std::string& l);
      const Expression& get_expression(const std::string& l) const;
 
    private:
      ExpressionArray()                                  = delete;
      ExpressionArray(const ExpressionArray&)            = delete;
      ExpressionArray& operator=(const ExpressionArray&) = delete;
 
    private:
      std::array<std::string, N> _label;
      std::array<Expression*, N> _expression;
      std::map<const std::string, int> _map;
    };
 
    template<int N>
    inline void
    ExpressionArray<N>::parse_xml() {
      int number = 0;
      std::string labels = "";
      Core::XmlParser& parser = Core::XmlParser::get();
      for (unsigned int i = 0; i < N; ++i) {
        const std::string& attr = _label[i];
        labels += attr + " ";
        Expression*& expr =  _expression[i];
 
        if (parser.attribute_exist(attr) == false) {
          expr = nullptr;
        } else {
          number++;
          const std::string str = parser.read_attribute<std::string>(attr, "");
          AssertMsg(str != "", "Internal error, the string can not be empty");
 
          // check if the expression is from an id
          if (Core::XmlObjectManager<Expression>::exist(str)) {
            expr = Core::XmlObjectManager<Expression>::get_item(str);
          } else {
            // ok, trying to instanciate the expression
            parser.XmlAssert(Expression::Check(str),
                             "The formula " + Core::String::quote(str) + " in not valid");
            expr = new Expression(str);
          }
        }
      }
    }
 
    template<int N>
    inline bool
    ExpressionArray<N>::expression_exist(const std::string& l) const {
      AssertMsg(_map.count(l) == 1, "Can't find the " + Core::String::quote(l) + " label");
      const unsigned int i = _map.at(l);
      return (_expression[i] != nullptr);
    }
 
    template<int N>
    inline double
    ExpressionArray<N>::value(const std::string& l) {
      AssertMsg(_map.count(l) == 1, "Can't find the " + Core::String::quote(l) + " label");
      const unsigned int i = _map.at(l);
      AssertMsg(_expression[i] != nullptr,
                "The expression labeled " + Core::String::quote(l) + " does not exist");
      return (*_expression[i])();
    }
 
    template<int N>
    inline double
    ExpressionArray<N>::value(const std::string& l) const {
      AssertMsg(_map.count(l) == 1, "Can't find the " + Core::String::quote(l) + " label");
      const unsigned int i = _map.at(l);
      AssertMsg(_expression[i] != nullptr,
                "The expression labeled " + Core::String::quote(l) + " does not exist");
      return (*_expression[i])();
    }
 
    template<int N>
    inline Expression&
    ExpressionArray<N>::get_expression(const std::string& l) {
      AssertMsg(_map.count(l) == 1, "Can't find the " + Core::String::quote(l) + " label");
      const unsigned int i = _map.at(l);
      AssertMsg(_expression[i] != nullptr,
                "The expression labeled " + Core::String::quote(l) + " does not exist");
      return *_expression[i];
    }
 
    template<int N>
    inline const Expression&
    ExpressionArray<N>::get_expression(const std::string& l) const {
      AssertMsg(_map.count(l) == 1, "Can't find the " + Core::String::quote(l) + " label");
      const unsigned int i = _map.at(l);
      AssertMsg(_expression[i] != nullptr,
                "The expression labeled " + Core::String::quote(l) + " does not exist");
      return *_expression[i];
    }
 
  }
 
}
 
 
 
 
#endif