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)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// THE SOFTWARE.
 
#pragma once
 
#include <filesystem>
#include <iostream>
 
#include "neml2/misc/errors.h"
#include "neml2/base/Settings.h"
#include "neml2/base/NEML2Object.h"
#include "neml2/base/OptionCollection.h"
 
namespace neml2
{
// Forward decl
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 = "");

class Factory
{
public:
  static Factory & get();

  static OptionCollection & options();

  static void load_options(const OptionCollection & all_options);

  static bool has_object(const std::string & section, const std::string & name);

  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 clear();

  static void print(std::ostream & os = std::cout);
 
protected:
  void create_object(const std::string & section, const OptionSet & options);
 
private:
  std::map<std::string, std::map<std::string, std::vector<std::shared_ptr<NEML2Object>>>> _objects;
};
class Factory {…};
 
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();
 
  if (Factory::options().data().empty())
    throw FactoryException("It appears that you are trying to get an object without loading any "
                           "options. Please load options first.");
 
  // 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);
        if (!obj)
          throw FactoryException(
              "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::options()[section])
    if (options.first == name)
    {
      auto new_options = options.second;
      new_options += additional_options;
      factory.create_object(section, new_options);
      break;
    }
 
  if (!factory._objects.count(section) || !factory._objects.at(section).count(name))
    throw FactoryException("Failed to get object named " + name + " under section " + section);
 
  auto obj = std::dynamic_pointer_cast<T>(factory._objects[section][name].back());
 
  if (!obj)
    throw FactoryException("Internal error: Factory failed to create object " + name);
 
  return obj;
}
Factory::get_object_ptr(const std::string & section, {…}
 
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);
}
Factory::get_object(const std::string & section, {…}
} // namespace neml2