130 lines
4.7 KiB
C++
130 lines
4.7 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 <optional>
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#include <string>
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namespace beedb::expression
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{
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class Attribute
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{
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public:
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Attribute() = default;
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explicit Attribute(std::string &&column_name) : _table_name{std::nullopt}, _column_name(std::move(column_name))
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{
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}
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explicit Attribute(const std::string &column_name) : _table_name{std::nullopt}, _column_name(column_name)
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{
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}
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Attribute(std::string &&table_name, std::string &&column_name)
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: _table_name(std::move(table_name)), _column_name(std::move(column_name))
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{
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}
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Attribute(const std::string &table_name, const std::string &column_name)
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: _table_name(table_name), _column_name(column_name)
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{
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}
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Attribute(const std::string &table_name, std::string &&column_name)
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: _table_name(table_name), _column_name(std::move(column_name))
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{
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}
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Attribute(std::optional<std::string> &&table_name, std::string &&column_name)
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: _table_name(std::move(table_name)), _column_name(std::move(column_name))
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{
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}
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Attribute(std::optional<std::string> &&table_name, std::string &&column_name, const bool print_table_name)
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: _table_name(std::move(table_name)), _column_name(std::move(column_name)), _print_table_name(print_table_name)
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{
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}
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Attribute(const std::optional<std::string> &table_name, std::string &&column_name)
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: _table_name(table_name), _column_name(std::move(column_name))
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{
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}
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Attribute(const Attribute &other, const bool print_table_name)
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: _table_name(other._table_name), _column_name(other._column_name), _print_table_name(print_table_name)
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{
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}
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Attribute(Attribute &&) = default;
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Attribute(const Attribute &) = default;
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~Attribute() = default;
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Attribute &operator=(const Attribute &) = default;
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Attribute &operator=(Attribute &&) = default;
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bool operator==(const Attribute &other) const
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{
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return _table_name == other._table_name && _column_name == other._column_name;
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}
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void table_name(const std::string &table_name)
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{
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_table_name = table_name;
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}
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[[nodiscard]] const std::optional<std::string> &table_name() const
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{
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return _table_name;
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}
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[[nodiscard]] const std::string &column_name() const
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{
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return _column_name;
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}
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[[nodiscard]] bool is_asterisk() const
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{
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return _column_name == "*";
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}
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[[nodiscard]] bool is_print_table_name() const
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{
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return _print_table_name;
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}
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explicit operator std::string() const
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{
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if (_table_name.has_value() && _print_table_name)
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{
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return _table_name.value() + "." + _column_name;
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}
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return _column_name;
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}
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private:
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std::optional<std::string> _table_name;
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std::string _column_name;
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bool _print_table_name = false;
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};
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} // namespace beedb::expression
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namespace std
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{
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template <> struct hash<beedb::expression::Attribute>
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{
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public:
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std::size_t operator()(const beedb::expression::Attribute &attribute) const
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{
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return std::hash<std::string>()(
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std::string{attribute.table_name().value_or("") + "." + attribute.column_name()});
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}
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};
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} // namespace std
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