beedb/include/util/ini_parser.h

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2022-04-04 20:25:01 +02:00
/*------------------------------------------------------------------------------*
* Architecture & Implementation of DBMS *
*------------------------------------------------------------------------------*
* Copyright 2022 Databases and Information Systems Group TU Dortmund *
* Visit us at *
* http://dbis.cs.tu-dortmund.de/cms/en/home/ *
* *
* 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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR *
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, *
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR *
* OTHER DEALINGS IN THE SOFTWARE. *
* *
* Authors: *
* Maximilian Berens <maximilian.berens@tu-dortmund.de> *
* Roland Kühn <roland.kuehn@cs.tu-dortmund.de> *
* Jan Mühlig <jan.muehlig@tu-dortmund.de> *
*------------------------------------------------------------------------------*
*/
#pragma once
#include <cstdint>
#include <string>
#include <unordered_map>
#include <utility>
namespace beedb::util
{
/**
* Parses an ini file and stores the parsed key,value tuples
* including sections.
*/
class IniParser
{
public:
using key_t = std::pair<std::string, std::string>;
using value_t = std::string;
/**
* Initializes the parser and parses the given
* .ini file.
*
* @param file_name
*/
explicit IniParser(const std::string &file_name);
~IniParser() = default;
/**
* @return True, if the parsed config is empty
* (maybe because the file was not found).
*/
[[nodiscard]] bool empty() const
{
return _configurations.empty();
}
/**
* Returns the value for a given
* key in a given section or the
* default value of the key does
* not exists.
*
* @param default_value
* @return Value of the key or default value.
*/
template <typename T> T get(const std::string &, const std::string &, const T &default_value) const
{
return default_value;
}
private:
struct key_t_hash
{
std::size_t operator()(const key_t &pair) const
{
return std::hash<std::string>()(pair.first) ^ std::hash<std::string>()(pair.second);
}
};
std::unordered_map<key_t, value_t, key_t_hash> _configurations;
/**
* Parses the ini file with the given name.
*
* @param file_name Name of the ini file.
*/
void parse(const std::string &file_name);
};
} // namespace beedb::util
template <>
inline std::string beedb::util::IniParser::get(const std::string &section, const std::string &key,
const std::string &default_value) const
{
const auto config_key = key_t{std::make_pair(section, key)};
if (this->_configurations.find(config_key) == this->_configurations.end())
{
return default_value;
}
return this->_configurations.at(config_key);
}
template <>
inline bool beedb::util::IniParser::get(const std::string &section, const std::string &key,
const bool &default_value) const
{
const auto config_key = key_t{std::make_pair(section, key)};
if (this->_configurations.find(config_key) == _configurations.end())
{
return default_value;
}
return bool(std::stoi(this->_configurations.at(config_key)));
}
template <>
inline std::int32_t beedb::util::IniParser::get(const std::string &section, const std::string &key,
const std::int32_t &default_value) const
{
const auto config_key = key_t{std::make_pair(section, key)};
if (this->_configurations.find(config_key) == this->_configurations.end())
{
return default_value;
}
return std::int32_t(std::stol(this->_configurations.at(config_key)));
}
template <>
inline std::uint32_t beedb::util::IniParser::get(const std::string &section, const std::string &key,
const std::uint32_t &default_value) const
{
const auto config_key = key_t{std::make_pair(section, key)};
if (this->_configurations.find(config_key) == this->_configurations.end())
{
return default_value;
}
return std::uint32_t(std::stoul(this->_configurations.at(config_key)));
}
template <>
inline std::int64_t beedb::util::IniParser::get(const std::string &section, const std::string &key,
const std::int64_t &default_value) const
{
const auto config_key = key_t{std::make_pair(section, key)};
if (this->_configurations.find(config_key) == this->_configurations.end())
{
return default_value;
}
return std::int64_t(std::stoll(this->_configurations.at(config_key)));
}
template <>
inline std::uint64_t beedb::util::IniParser::get(const std::string &section, const std::string &key,
const std::uint64_t &default_value) const
{
const auto config_key = key_t{std::make_pair(section, key)};
if (this->_configurations.find(config_key) == this->_configurations.end())
{
return default_value;
}
return std::uint64_t(std::stoull(this->_configurations.at(config_key)));
}