Factory.h

// Copyright 2024, UChicago Argonne, LLC
// All Rights Reserved
// Software Name: NEML2 -- the New Engineering material Model Library, version 2
// By: Argonne National Laboratory
// OPEN SOURCE LICENSE (MIT)
//
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#pragma once
 
#include <filesystem>
#include "neml2/base/NEML2Object.h"
#include "neml2/misc/error.h"
#include "neml2/base/OptionCollection.h"
#include "neml2/base/DiagnosticsInterface.h"
 
namespace neml2
{
// Forward decl
class Model;
class Driver;
class Settings;
 
void load_input(const std::filesystem::path & path, const std::string & additional_input = "");
 
void reload_input(const std::filesystem::path & path, const std::string & additional_input = "");
 
Model & get_model(const std::string & mname, bool force_create = true);
 
Model & load_model(const std::filesystem::path & path, const std::string & mname);
 
Model & reload_model(const std::filesystem::path & path, const std::string & mname);
 
Driver & get_driver(const std::string & dname);
 
class Factory
{
public:
  static Factory & get();
 
  template <class T>
  static std::shared_ptr<T> get_object_ptr(const std::string & section,
                                           const std::string & name,
                                           const OptionSet & additional_options = OptionSet(),
                                           bool force_create = true);
 
  template <class T>
  static T & get_object(const std::string & section,
                        const std::string & name,
                        const OptionSet & additional_options = OptionSet(),
                        bool force_create = true);
 
  static void load_options(const OptionCollection & all_options);
 
  static const OptionCollection & loaded_options();
 
  static void clear();
 
  static void print(std::ostream & os = std::cout);
 
protected:
  void create_object(const std::string & section, const OptionSet & options);
 
private:
  OptionCollection _all_options;
 
  std::map<std::string, std::map<std::string, std::vector<std::shared_ptr<NEML2Object>>>> _objects;
 
  Settings _settings;
};
 
template <class T>
inline std::shared_ptr<T>
Factory::get_object_ptr(const std::string & section,
                        const std::string & name,
                        const OptionSet & additional_options,
                        bool force_create)
{
  auto & factory = Factory::get();
 
  // Easy if it already exists
  if (!force_create)
    if (factory._objects.count(section) && factory._objects.at(section).count(name))
      for (const auto & neml2_obj : factory._objects[section][name])
      {
        // Check for option clash
        if (!options_compatible(neml2_obj->input_options(), additional_options))
          continue;
 
        // Check for object type
        auto obj = std::dynamic_pointer_cast<T>(neml2_obj);
        neml_assert(obj != nullptr,
                    "Found object named ",
                    name,
                    " under section ",
                    section,
                    ". But dynamic cast failed. Did you specify the correct object type?");
 
        return obj;
      }
 
  // Otherwise try to create it
  for (auto & options : factory._all_options[section])
    if (options.first == name)
    {
      auto new_options = options.second;
      new_options += additional_options;
      factory.create_object(section, new_options);
      break;
    }
 
  neml_assert(factory._objects.count(section) && factory._objects.at(section).count(name),
              "Failed to get object named ",
              name,
              " under section ",
              section);
 
  auto obj = std::dynamic_pointer_cast<T>(factory._objects[section][name].back());
  neml_assert(obj != nullptr, "Internal error: Factory failed to create object ", name);
  return obj;
}
 
template <class T>
inline T &
Factory::get_object(const std::string & section,
                    const std::string & name,
                    const OptionSet & additional_options,
                    bool force_create)
{
  return *Factory::get_object_ptr<T>(section, name, additional_options, force_create);
}
} // namespace neml2