140 lines
6.1 KiB
C++
140 lines
6.1 KiB
C++
#ifndef MATADOR_OBJECT_GENERATOR_HPP
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#define MATADOR_OBJECT_GENERATOR_HPP
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#include "matador/object/object.hpp"
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#include "matador/utils/access.hpp"
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#include "matador/utils/primary_key_attribute.hpp"
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#include <memory>
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namespace matador::object {
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class repository;
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class pk_type_determinator {
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private:
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pk_type_determinator() = default;
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public:
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template<class Type>
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static utils::basic_type determine() {
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pk_type_determinator determinator;
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Type t;
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access::process(determinator, t);
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return determinator.type_;
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}
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template<typename ValueType>
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void on_primary_key(const char *, ValueType &/*pk*/, const utils::primary_key_attribute& attr = utils::default_pk_attributes) {
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type_ = utils::data_type_traits<ValueType>::type(attr.size());
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}
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static void on_revision(const char * /*id*/, uint64_t &/*rev*/) {}
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template < class Type >
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static void on_attribute(const char * /*id*/, Type &/*x*/, const utils::field_attributes &/*attr*/ = utils::null_attributes) {}
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static 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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static 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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static 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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static 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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static void on_has_many_to_many(const char * /*id*/, ContainerType & /*cont*/, 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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static void on_has_many_to_many(const char * /*id*/, ContainerType & /*cont*/, 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 object_generator {
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private:
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explicit object_generator(const repository& repo, std::unique_ptr<object> &&object);
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public:
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template < class Type >
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static std::unique_ptr<object> generate(const repository &repo, const std::string &name, const std::string &alias = "") {
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return generate(std::make_unique<Type>(), repo, name, alias);
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}
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template < class Type >
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static std::unique_ptr<object> generate(std::unique_ptr<Type>&& t, const repository &repo, const std::string &name, const std::string &alias = "") {
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object_generator gen(repo, std::make_unique<object>(name, alias));
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access::process(gen, *t);
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return gen.move();
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}
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[[nodiscard]] std::unique_ptr<object> move() { return std::move(object_); }
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template < class Type >
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void on_primary_key(const char *, Type &x, const utils::primary_key_attribute& attr = utils::default_pk_attributes);
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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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on_foreign_key(id, x);
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create_fk_constraint( typeid(typename Pointer::value_type), id);
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}
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template<class Pointer>
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static void on_has_one(const char * /*id*/, Pointer &/*x*/, const utils::foreign_attributes &/*attr*/) {}
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template <class Pointer>
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void on_foreign_key(const char *id, Pointer &/*x*/) {
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const auto type = pk_type_determinator::determine<typename Pointer::value_type>();
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auto &ref = object_->attributes_.emplace_back(id, type, utils::constraints::ForeignKey, null_option_type::NotNull);
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ref.owner_ = object_.get();
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}
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template<class ContainerType>
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static 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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static void on_has_many_to_many(const char * /*id*/, ContainerType & /*cont*/, 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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static void on_has_many_to_many(const char * /*id*/, ContainerType & /*cont*/, const utils::foreign_attributes &/*attr*/) {}
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private:
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template<typename ValueType>
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attribute &emplace_attribute(const char *id, const utils::field_attributes& attr, null_option_type null_option) {
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auto &ref = object_->attributes_.emplace_back(id, utils::data_type_traits<ValueType>::type(attr.size()), attr, null_option);
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ref.owner_ = object_.get();
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return ref;
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}
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void create_pk_constraint(const std::string& name) const;
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void create_fk_constraint(const std::type_index& ti, const std::string& name) const;
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void create_unique_constraint(const std::string& name) const;
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[[nodiscard]] std::list<attribute>::iterator find_attribute_by_name(const std::string &name) const;
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void prepare_primary_key(attribute &ref, utils::identifier &&pk) const;
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private:
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const repository &repo_;
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std::unique_ptr<object> object_;
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};
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template<typename ValueType>
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void object_generator::on_primary_key(const char *id, ValueType &x, const utils::primary_key_attribute& attr) {
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auto &ref = emplace_attribute<ValueType>(id, { attr.size(), utils::constraints::PrimaryKey }, null_option_type::NotNull);
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prepare_primary_key(ref, utils::identifier(x));
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create_pk_constraint(id);
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}
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template<typename Type>
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void object_generator::on_attribute(const char *id, Type &/*x*/, const utils::field_attributes &attr) {
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std::ignore = emplace_attribute<Type>(id, attr, null_option_type::NotNull);
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}
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template<typename Type>
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void object_generator::on_attribute(const char *id, std::optional<Type> & /*x*/, const utils::field_attributes &attr) {
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std::ignore = emplace_attribute<Type>(id, attr, null_option_type::Nullable);
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}
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}
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#endif //MATADOR_OBJECT_GENERATOR_HPP
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