160 lines
4.2 KiB
C++
160 lines
4.2 KiB
C++
/*------------------------------------------------------------------------------*
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* Architecture & Implementation of DBMS *
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*------------------------------------------------------------------------------*
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* Copyright 2022 Databases and Information Systems Group TU Dortmund *
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* Visit us at *
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* http://dbis.cs.tu-dortmund.de/cms/en/home/ *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR *
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, *
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR *
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* OTHER DEALINGS IN THE SOFTWARE. *
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* *
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* Authors: *
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* Maximilian Berens <maximilian.berens@tu-dortmund.de> *
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* Roland Kühn <roland.kuehn@cs.tu-dortmund.de> *
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* Jan Mühlig <jan.muehlig@tu-dortmund.de> *
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*------------------------------------------------------------------------------*
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*/
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#pragma once
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#include "date.h"
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#include <cstdint>
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#include <string>
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namespace beedb::table
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{
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/**
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* Represents a database type.
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*/
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class Type
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{
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public:
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/**
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* Ids for types.
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*/
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enum Id : std::uint16_t
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{
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INT,
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LONG,
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DECIMAL,
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CHAR,
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DATE,
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UNDEFINED
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};
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[[nodiscard]] static Type make_int() noexcept
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{
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return Type{Id::INT};
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}
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[[nodiscard]] static Type make_long() noexcept
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{
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return Type{Id::LONG};
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}
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[[nodiscard]] static Type make_decimal() noexcept
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{
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return Type{Id::DECIMAL};
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}
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[[nodiscard]] static Type make_char(const std::uint16_t length) noexcept
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{
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return Type{Id::CHAR, length};
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}
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[[nodiscard]] static Type make_date() noexcept
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{
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return Type{Id::DATE};
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}
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constexpr Type() : _id(Id::UNDEFINED)
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{
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}
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constexpr Type(const Id id, const std::uint16_t length = 0u) : _id(id), _length(length)
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{
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}
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constexpr Type(const Type &other) = default;
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~Type() = default;
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/**
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* @return Length of the type if the length is dynamic (like char).
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*/
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[[nodiscard]] std::uint16_t dynamic_length() const
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{
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return _length;
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}
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operator Id() const
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{
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return _id;
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}
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bool operator==(Id id) const
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{
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return _id == id;
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}
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bool operator!=(Id id) const
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{
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return _id != id;
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}
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Type &operator=(const Id id)
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{
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_id = id;
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return *this;
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}
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Type &operator=(const Type &other) = default;
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/**
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* @return Real size in bytes of the type.
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*/
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[[nodiscard]] std::uint16_t size() const
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{
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switch (_id)
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{
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case INT:
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return sizeof(std::int32_t);
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case LONG:
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return sizeof(std::int64_t);
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case CHAR:
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return sizeof(std::int8_t) * dynamic_length();
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case DECIMAL:
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return sizeof(double);
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case DATE:
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return sizeof(Date);
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case UNDEFINED:
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return 0;
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}
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}
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/**
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* @return Name of the type.
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*/
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[[nodiscard]] std::string name() const
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{
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switch (_id)
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{
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case INT:
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return "INT";
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case LONG:
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return "LONG";
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case DECIMAL:
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return "DECIMAL";
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case DATE:
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return "DATE";
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case CHAR:
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return "CHAR(" + std::to_string(std::int32_t(dynamic_length())) + ")";
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case UNDEFINED:
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return "UNDEFINED";
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}
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}
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private:
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Id _id;
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std::uint16_t _length{0U};
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} __attribute__((packed));
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} // namespace beedb::table
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