artis-star/src/artis-star/common/event/Value.hpp

/**
 * @file common/event/Value.hpp
 * @author The ARTIS Development Team
 * See the AUTHORS or Authors.txt file
 */

/*
 * ARTIS - the multimodeling and simulation environment
 * This file is a part of the ARTIS environment
 *
 * Copyright (C) 2013-2022 ULCO http://www.univ-littoral.fr
 *
 * 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 COMMON_EVENT_VALUE
#define COMMON_EVENT_VALUE

#include <boost/serialization/serialization.hpp>
#include <boost/serialization/array.hpp>

#include <cassert>
#include <cstring>
#include <functional>
#include <map>
#include <numeric>
#include <string>
#include <typeinfo>
#include <vector>

namespace artis::common::event {

class Value {
public:
  Value()
    : _content(nullptr), _size(0), _type_id(0) {}

  template<typename T>
  Value(const T &value) { assign(&value, sizeof(T), typeid(T).hash_code()); }

  template<typename T>
  Value(const T *value, size_t size) { assign(value, sizeof(T) * size, typeid(T *).hash_code()); }

  template<typename T>
  Value(const std::vector<T> &value) {
    const T *v = value.data();

    assign(v, sizeof(T) * value.size(), typeid(T *).hash_code());
  }

  Value(const std::vector<bool> &value) {
    size_t size = sizeof(bool) * value.size();

    _content = new char[size];
    for (size_t i = 0; i < value.size(); ++i) {
      _content[i] = value[i];
    }
    _size = size;
    _type_id = typeid(bool *).hash_code();
  }

  Value(void *content, size_t size) { assign(content, size, typeid(void *).hash_code()); }

  Value(const char *value, unsigned int size) { assign(value, size * sizeof(char), typeid(char *).hash_code()); }

  Value(const Value &value) {
    if (value._content != nullptr) {
      assign(value._content, value._size, value._type_id);
    } else {
      _content = nullptr;
      _size = 0;
      _type_id = 0;
    }
  }

  Value(Value &&value) : _content(value._content), _size(value._size), _type_id(value._type_id) {
    value._content = nullptr;
    value._size = 0;
    value._type_id = 0;
  }

  virtual ~Value() {
    delete[] _content;
  }

  bool is_null() const { return _content == nullptr; }

  template<typename Z>
  bool is_type() const { return _type_id == typeid(Z).hash_code(); }

  bool operator==(const Value &other) const {
    return _type_id == other._type_id and _size == other._size
           and std::memcmp(_content, other._content, _size) == 0;
  }

  template<typename T>
  void operator()(T &value) const {

    assert(_type_id == typeid(T).hash_code());

    value = *(T *) (_content);
  }

  template<typename T>
  void operator()(T *&value) const {

    assert(_type_id == typeid(T *).hash_code());

    value = (T *) (_content);
  }

  template<typename T>
  void operator()(std::vector<T> &value) const {
    assert(_type_id == typeid(T *).hash_code());

    size_t size = _size / sizeof(T);

    for (size_t i = 0; i < size; ++i) {
      value.push_back(((T *) (_content))[i]);
    }
  }

  Value &operator=(const Value &value) {
    delete[] _content;
    if (value._content != nullptr) {
      assign(value._content, value._size, value._type_id);
    } else {
      _content = nullptr;
      _size = 0;
      _type_id = 0;
    }
    return *this;
  }

  Value &operator=(Value &&value) {
    delete[] _content;
    _content = value._content;
    value._content = nullptr;
    _size = value._size;
    value._size = 0;
    _type_id = value._type_id;
    value._type_id = 0;
    return *this;
  }

  template<typename Z>
  size_t size() const {

    assert(is_type<Z *>());

    return _size / sizeof(Z);
  }

  std::string to_string() const {
    if (is_null()) {
      return "<null>";
    }

    auto it = convert.find(_type_id);

    if (it != convert.cend()) {
      return it->second(*this);
    }
    return "<unstringify>";
  }

private:
  typedef std::map<unsigned long, std::function<std::string(const artis::common::event::Value &)>> ConvertFunctions;

  static const ConvertFunctions convert;

  void assign(const void *content, size_t size, size_t type_id) {
    _content = new char[size];
    std::memcpy(_content, content, size);
    _size = size;
    _type_id = type_id;
  }

  friend class boost::serialization::access;

  template<typename Archive>
  void serialize(Archive &ar, const unsigned int version) {
    (void) version;

    ar & _size;
    if (Archive::is_loading::value) {
      assert(_content == nullptr);
      _content = new char[_size];
    }
    ar & boost::serialization::make_array<char>(_content, _size);
    ar & _type_id;
  }

  char *_content = nullptr;
  size_t _size = 0;
  size_t _type_id = 0;
};

std::ostream& operator<<(std::ostream& o, const artis::common::event::Value& value);

} // namespace artis common event

#endif