133 lines
5.3 KiB
C++
133 lines
5.3 KiB
C++
#ifndef QUERY_COLUMN_DEFINITION_GENERATOR_HPP
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#define QUERY_COLUMN_DEFINITION_GENERATOR_HPP
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#include "attribute_definition.hpp"
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#include "matador/utils/access.hpp"
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#include "matador/utils/data_type_traits.hpp"
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#include "matador/utils/field_attributes.hpp"
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#include "matador/utils/foreign_attributes.hpp"
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#include <typeindex>
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#include <vector>
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namespace matador::object {
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class schema;
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class fk_attribute_generator
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{
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public:
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fk_attribute_generator() = default;
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template<class Type>
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attribute_definition generate(const char *id, Type &x, const std::string &ref_table, const std::string &ref_column)
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{
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access::process(*this, x);
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return attribute_definition{id, type_, 0, ref_table, ref_column, {utils::constraints::FOREIGN_KEY }, null_option::NOT_NULL};
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}
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template<typename ValueType>
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void on_primary_key(const char *, ValueType &/*pk*/, std::enable_if_t<std::is_integral_v<ValueType> && !std::is_same_v<bool, ValueType>>* = nullptr)
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{
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type_ = utils::data_type_traits<ValueType>::type(0);
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}
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void on_primary_key(const char * /*id*/, std::string &/*pk*/, size_t size);
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void on_revision(const char * /*id*/, unsigned long long &/*rev*/) {}
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template < class Type >
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void on_attribute(const char * /*id*/, Type &/*x*/, const utils::field_attributes &/*attr*/ = utils::null_attributes) {}
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void on_attribute(const char * /*id*/, char * /*x*/, const utils::field_attributes &/*attr*/ = utils::null_attributes) {}
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template<class Pointer>
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void on_belongs_to(const char * /*id*/, Pointer &/*x*/, const utils::foreign_attributes &/*attr*/) {}
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template<class Pointer>
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void on_has_one(const char * /*id*/, Pointer &/*x*/, const utils::foreign_attributes &/*attr*/) {}
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template<class ContainerType>
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void on_has_many(const char * /*id*/, ContainerType &, const char *, const utils::foreign_attributes &/*attr*/) {}
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template<class ContainerType>
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void on_has_many_to_many(const char *id, ContainerType &c, const char *join_column, const char *inverse_join_column, const utils::foreign_attributes &/*attr*/) {}
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template<class ContainerType>
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void on_has_many_to_many(const char *id, ContainerType &c, const utils::foreign_attributes &/*attr*/) {}
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private:
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utils::basic_type type_{};
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};
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class attribute_definition_generator final {
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private:
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attribute_definition_generator(std::vector<attribute_definition> &columns, const schema &repo);
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public:
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~attribute_definition_generator() = default;
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template < class Type >
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static std::vector<attribute_definition> generate(const schema &repo)
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{
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std::vector<attribute_definition> columns;
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attribute_definition_generator gen(columns, repo);
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Type obj;
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access::process(gen, obj);
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return std::move(columns);
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}
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template < class V >
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void on_primary_key(const char *, V &x, std::enable_if_t<std::is_integral_v<V> && !std::is_same_v<bool, V>>* = nullptr);
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void on_primary_key(const char *id, std::string &pk, size_t size);
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void on_revision(const char *id, uint64_t &rev);
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template<typename Type>
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void on_attribute(const char *id, Type &x, const utils::field_attributes &attr = utils::null_attributes);
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template<typename Type>
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void on_attribute(const char *id, std::optional<Type> &x, const utils::field_attributes &attr = utils::null_attributes);
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template<class Pointer>
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void on_belongs_to(const char *id, Pointer &x, const utils::foreign_attributes &/*attr*/)
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{
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const auto ref_column = determine_foreign_ref(std::type_index(typeid(typename Pointer::value_type)));
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columns_.push_back(fk_column_generator_.generate(id, *x, ref_table, ref_column));
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}
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template<class Pointer>
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void on_has_one(const char *id, Pointer &x, const utils::foreign_attributes &/*attr*/)
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{
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const auto [ref_table, ref_column] = determine_foreign_ref(std::type_index(typeid(typename Pointer::value_type)));
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columns_.push_back(fk_column_generator_.generate(id, *x, ref_table, ref_column));
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}
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template<class ContainerType>
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void on_has_many(const char *id, ContainerType &, const char *, const utils::foreign_attributes &/*attr*/) {}
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template<class ContainerType>
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void on_has_many_to_many(const char *id, ContainerType &c, const char *join_column, const char *inverse_join_column, const utils::foreign_attributes &/*attr*/) {}
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template<class ContainerType>
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void on_has_many_to_many(const char *id, ContainerType &c, const utils::foreign_attributes &/*attr*/) {}
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private:
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std::shared_ptr<attribute_definition> determine_foreign_ref(const std::type_index &ti);
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private:
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size_t index_ = 0;
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std::vector<attribute_definition> &columns_;
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const schema &repo_;
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fk_attribute_generator fk_column_generator_;
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};
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template<typename V>
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void attribute_definition_generator::on_primary_key(const char *id, V &x, std::enable_if_t<std::is_integral_v<V> && !std::is_same_v<bool, V>>*)
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{
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on_attribute(id, x, { utils::constraints::PRIMARY_KEY });
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}
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template<typename Type>
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void attribute_definition_generator::on_attribute(const char *id, Type &x, const utils::field_attributes &attr)
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{
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columns_.emplace_back(id, x, attr, null_option::NOT_NULL);
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}
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template<typename Type>
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void attribute_definition_generator::on_attribute(const char *id, std::optional<Type> &x, const utils::field_attributes &attr)
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{
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columns_.emplace_back(id, utils::data_type_traits<Type>::type(attr.size()), attr, null_option::NULLABLE);
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}
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}
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#endif //QUERY_COLUMN_DEFINITION_GENERATOR_HPP
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