beedb/include/table/type.h

160 lines
4.2 KiB
C
Raw Permalink Normal View History

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 "date.h"
#include <cstdint>
#include <string>
namespace beedb::table
{
/**
* Represents a database type.
*/
class Type
{
public:
/**
* Ids for types.
*/
enum Id : std::uint16_t
{
INT,
LONG,
DECIMAL,
CHAR,
DATE,
UNDEFINED
};
[[nodiscard]] static Type make_int() noexcept
{
return Type{Id::INT};
}
[[nodiscard]] static Type make_long() noexcept
{
return Type{Id::LONG};
}
[[nodiscard]] static Type make_decimal() noexcept
{
return Type{Id::DECIMAL};
}
[[nodiscard]] static Type make_char(const std::uint16_t length) noexcept
{
return Type{Id::CHAR, length};
}
[[nodiscard]] static Type make_date() noexcept
{
return Type{Id::DATE};
}
constexpr Type() : _id(Id::UNDEFINED)
{
}
constexpr Type(const Id id, const std::uint16_t length = 0u) : _id(id), _length(length)
{
}
constexpr Type(const Type &other) = default;
~Type() = default;
/**
* @return Length of the type if the length is dynamic (like char).
*/
[[nodiscard]] std::uint16_t dynamic_length() const
{
return _length;
}
operator Id() const
{
return _id;
}
bool operator==(Id id) const
{
return _id == id;
}
bool operator!=(Id id) const
{
return _id != id;
}
Type &operator=(const Id id)
{
_id = id;
return *this;
}
Type &operator=(const Type &other) = default;
/**
* @return Real size in bytes of the type.
*/
[[nodiscard]] std::uint16_t size() const
{
switch (_id)
{
case INT:
return sizeof(std::int32_t);
case LONG:
return sizeof(std::int64_t);
case CHAR:
return sizeof(std::int8_t) * dynamic_length();
case DECIMAL:
return sizeof(double);
case DATE:
return sizeof(Date);
case UNDEFINED:
return 0;
}
}
/**
* @return Name of the type.
*/
[[nodiscard]] std::string name() const
{
switch (_id)
{
case INT:
return "INT";
case LONG:
return "LONG";
case DECIMAL:
return "DECIMAL";
case DATE:
return "DATE";
case CHAR:
return "CHAR(" + std::to_string(std::int32_t(dynamic_length())) + ")";
case UNDEFINED:
return "UNDEFINED";
}
}
private:
Id _id;
std::uint16_t _length{0U};
} __attribute__((packed));
} // namespace beedb::table