abstract_string_option.h

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/*
   Copyright (c) 2014, 2024, Oracle and/or its affiliates.
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.
 
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   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
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   the program or referenced in the documentation.
 
   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, version 2.0, for more details.
 
   You should have received a copy of the GNU General Public License
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/
 
#ifndef ABSTRACT_STRING_OPTION_INCLUDED
#define ABSTRACT_STRING_OPTION_INCLUDED
 
#include <functional>
#include <optional>
#include <string>
 
#include "client/base/abstract_value_option.h"
#include "my_getopt.h"
 
namespace Mysql {
namespace Tools {
namespace Base {
namespace Options {
 
/**
  Abstract option to handle options accepting string value argument.
 */
template <typename T_type>
class Abstract_string_option : public Abstract_value_option<T_type> {
 public:
  /**
    Sets value for this option. If it is specified before handling commandline
    options then supplied value is used as default value of this option.
   */
  T_type *set_value(std::string value);
 
 protected:
  /**
    Constructs new string option.
    @param value Pointer to string object to receive option value.
    @param var_type my_getopt internal option type.
    @param name Name of option. It is used in command line option name as
      --name.
    @param description Description of option to be printed in --help.
   */
  Abstract_string_option(std::optional<std::string> *value, ulong var_type,
                         std::string name, std::string description);
 
  std::optional<std::string> *m_destination_value;
 
 private:
  void string_callback(char *argument);
 
  const char *m_original_value;
};
 
template <typename T_type>
Abstract_string_option<T_type>::Abstract_string_option(
    std::optional<std::string> *value, ulong var_type, std::string name,
    std::string description)
    : Abstract_value_option<T_type>(&this->m_original_value, var_type, name,
                                    description, (uint64)NULL),
      m_destination_value(value) {
  *value = std::optional<std::string>();
  this->m_original_value = nullptr;
 
  this->add_callback(new std::function<void(char *)>(
      std::bind(&Abstract_string_option<T_type>::string_callback, this,
                std::placeholders::_1)));
}
 
template <typename T_type>
T_type *Abstract_string_option<T_type>::set_value(std::string value) {
  *this->m_destination_value = std::optional<std::string>(value);
  this->m_original_value = this->m_destination_value->value().c_str();
  this->m_option_structure.def_value =
      (uint64)this->m_destination_value->value().c_str();
  return (T_type *)this;
}
 
template <typename T_type>
void Abstract_string_option<T_type>::string_callback(char *argument) {
  if (argument != nullptr) {
    // Copy argument value from char* to destination string.
    *this->m_destination_value =
        std::optional<std::string>(this->m_original_value);
  } else {
    // There is no argument supplied, we shouldn't change default value.
  }
}
 
}  // namespace Options
}  // namespace Base
}  // namespace Tools
}  // namespace Mysql
 
#endif