attaching schema nodes progress
This commit is contained in:
Sascha Kühl
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#ifndef RELATION_COMPLETER_HPP
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#define RELATION_COMPLETER_HPP
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#include "matador/object/internal/shadow_schema.hpp"
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#include "matador/object/many_to_many_relation.hpp"
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#include "matador/object/join_columns_collector.hpp"
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#include "matador/object/object_ptr.hpp"
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#include "matador/object/schema_node.hpp"
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#include "matador/logger/log_manager.hpp"
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#include <stack>
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namespace matador::object {
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/*
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* 1. has_many (MM)
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* no belongs to
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* relation table is needed
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* - element type is a foreign table (FT),
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* then relation table must look like follows:
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* relation_table<MM, FT>
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* where MM and FT must be defined as belongs to
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* - element type if a builtin type BT (i.e. string, int, etc.),
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* then the relation table must look like follows:
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* relation_table<MM, BT>
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* where MM as belongs to and BT as given type
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*
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* 2. has_many_to_many (MM1, MM2)
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* relation_table is needed
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* relation_table<MM1, MM2>
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* where MM1 and MM2 must be defined as belongs to
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*
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* 3. hans_many (MM) <-> belongs_to (BT)
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* belongs_to has foreign key to the has_many side
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* no relation table needed
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*
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* 4. has_one to belongs_to
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* no relation table is needed
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*
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* 5. has_many (MM) <-> has_one (HO)
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* invalid relation -> error
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*
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* 6. has_one
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* no has_many or belongs_to
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* invalid relation -> error
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*/
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template<typename Type>
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class relation_completer final {
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private:
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using node_ptr = std::shared_ptr<schema_node>;
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public:
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using endpoint_ptr = std::shared_ptr<relation_endpoint>;
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static void complete(const std::shared_ptr<schema_node> &node) {
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internal::shadow_schema shadow(node->schema_);
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relation_completer completer(shadow);
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completer.complete_node_relations(node);
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}
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template<class PrimaryKeyType>
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static void on_primary_key(const char * /*id*/, PrimaryKeyType &/*pk*/, std::enable_if_t<std::is_integral_v<PrimaryKeyType> && !std::is_same_v<bool, PrimaryKeyType>> * = nullptr) {}
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static void on_primary_key(const char * /*id*/, std::string &/*pk*/, size_t /*size*/) {}
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static void on_revision(const char * /*id*/, uint64_t &/*rev*/) {}
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template<typename AttributeType>
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static void on_attribute(const char * /*id*/, AttributeType &/*val*/, const utils::field_attributes &/*attr*/ = utils::null_attributes) {}
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template<typename AttributeType>
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static void on_attribute(const char * /*id*/, std::optional<AttributeType> &/*val*/, const utils::field_attributes &/*attr*/ = utils::null_attributes) {}
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template<class ForeignPointerType>
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void on_belongs_to(const char *id, ForeignPointerType &obj, const utils::foreign_attributes &attr);
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template<class ForeignPointerType>
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void on_has_one(const char * /*id*/, ForeignPointerType &/*obj*/, const utils::foreign_attributes &/*attr*/);
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template<class CollectionType>
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void on_has_many(const char *id, CollectionType &, const char *join_column, const utils::foreign_attributes &attr, std::enable_if_t<is_object_ptr<typename CollectionType::value_type>::value> * = nullptr);
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template<class CollectionType>
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void on_has_many(const char *id, CollectionType &, const char *join_column, const utils::foreign_attributes &attr, std::enable_if_t<!is_object_ptr<typename CollectionType::value_type>::value> * = nullptr);
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template<class CollectionType>
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void on_has_many_to_many(const char *id, CollectionType &collection, const char *join_column, const char *inverse_join_column, const utils::foreign_attributes &attr);
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template<class CollectionType>
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void on_has_many_to_many(const char *id, CollectionType &collection, const utils::foreign_attributes &attr);
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private:
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explicit relation_completer(internal::shadow_schema &shadow)
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: schema_(shadow)
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, log_(logger::create_logger("relation_completer")) {
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}
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void complete_node_relations(const std::shared_ptr<schema_node> &node) {
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nodes_.push(node);
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Type obj;
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access::process(*this, obj);
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nodes_.pop();
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}
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static void register_relation_endpoints(const endpoint_ptr &endpoint,
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const endpoint_ptr &other_endpoint);
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static void link_relation_endpoints(const endpoint_ptr &endpoint,
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const endpoint_ptr &other_endpoint);
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private:
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std::stack<node_ptr> nodes_;
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internal::shadow_schema &schema_;
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logger::logger log_;
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join_columns_collector join_columns_collector_{};
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};
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template<typename Type>
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template<class CollectionType>
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void relation_completer<Type>::on_has_many(const char *id, CollectionType &,
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const char *join_column,
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const utils::foreign_attributes &,
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std::enable_if_t<is_object_ptr<typename CollectionType::value_type>::value> * /*unused*/) {
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// Shortcut to a value type of object_ptr::value_type in a collection
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using value_type = typename CollectionType::value_type::value_type;
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using relation_value_type = many_to_many_relation<value_type, Type>;
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// Check if the object_ptr type is already inserted in the schema (by id)
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auto result = schema_.find_node(typeid(value_type));
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if (!result) {
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// Todo: throw internal error or attach node
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return;
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}
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if (const auto endpoint = nodes_.top()->info().find_relation_endpoint(typeid(relation_value_type)); endpoint == nodes_.top()->info().endpoint_end()) {
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// Endpoint was not found
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log_.debug("node '%s' has has many foreign keys '%s' mapped by '%s'", nodes_.top()->name().c_str(), id, join_column);
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const auto node = schema_node::make_relation_node<relation_value_type>(
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schema_.schema(), id, [join_column] {
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return std::make_unique<relation_value_type>(join_column, "id");
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});
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result = schema_.attach_node(node);
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if (!result) {
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// Todo: throw internal error
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return;
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}
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const auto local_endpoint = std::make_shared<relation_endpoint>(id, relation_type::HAS_MANY, nodes_.top());
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const auto foreign_endpoint = std::make_shared<relation_endpoint>(join_column, relation_type::BELONGS_TO, node);
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nodes_.top()->info_->register_relation_endpoint(typeid(value_type), local_endpoint);
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foreign_endpoint->node_->info_->register_relation_endpoint(nodes_.top()->type_index(), foreign_endpoint);
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link_relation_endpoints(local_endpoint, foreign_endpoint);
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} else {
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const auto &foreign_node = result.value();
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if (const auto rit = foreign_node->info_->find_relation_endpoint(nodes_.top()->type_index());
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rit != foreign_node->info().endpoint_end()) {
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if (rit->second->is_belongs_to()) {
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rit->second->node_ = foreign_node;
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const auto localEndpoint = std::make_shared<relation_endpoint>(id, relation_type::HAS_MANY, nodes_.top());
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nodes_.top()->info_->register_relation_endpoint(nodes_.top()->type_index(), localEndpoint);
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link_relation_endpoints(localEndpoint, rit->second);
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} else {
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// Todo: throw internal error relation node has invalid type
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}
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} else {
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// Todo: throw internal error couldn't find relation node
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}
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}
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}
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template<typename Type>
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template<class CollectionType>
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void relation_completer<Type>::on_has_many(const char *id, CollectionType &, const char *join_column,
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const utils::foreign_attributes &,
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std::enable_if_t<!is_object_ptr<typename CollectionType::value_type>::value>
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* /*unused*/) {
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using value_type = typename CollectionType::value_type;
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using relation_value_type = many_to_relation<Type, value_type>;
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const auto node = schema_node::make_relation_node<relation_value_type>(
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schema_.schema(), id, [join_column] {
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return std::make_unique<relation_value_type>(join_column, "value");
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});
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const auto result = schema_.attach_node(node);
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if (!result) {
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// Todo: throw internal exception
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}
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const auto local_endpoint = std::make_shared<relation_endpoint>(id, relation_type::HAS_MANY, nodes_.top());
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const auto foreign_endpoint = std::make_shared<relation_endpoint>(join_column, relation_type::BELONGS_TO, node);
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nodes_.top()->info_->register_relation_endpoint(typeid(value_type), local_endpoint);
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foreign_endpoint->node_->info_->register_relation_endpoint(nodes_.top()->type_index(), foreign_endpoint);
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link_relation_endpoints(local_endpoint, foreign_endpoint);
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}
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template<typename Type>
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template<class CollectionType>
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void relation_completer<Type>::on_has_many_to_many(const char *id,
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CollectionType &/*collection*/,
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const char *join_column,
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const char *inverse_join_column,
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const utils::foreign_attributes &/*attr*/) {
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using relation_value_type = many_to_many_relation<typename CollectionType::value_type::value_type, Type>;
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auto result = schema_.find_node(typeid(relation_value_type));
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if (result) {
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// Found relation node.
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// Complete relation links
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const auto &foreign_node = result.value();
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const auto local_endpoint = std::make_shared<relation_endpoint>(id, relation_type::HAS_MANY, nodes_.top());
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nodes_.top()->info_->register_relation_endpoint(typeid(typename CollectionType::value_type::value_type), local_endpoint);
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const auto it = foreign_node->info_->find_relation_endpoint(nodes_.top()->type_index());
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if (it == foreign_node->info().endpoint_end()) {
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// Todo: Throw error
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return;
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}
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link_relation_endpoints(local_endpoint, it->second);
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} else {
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// Relation not not found.
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auto creator = [join_column, inverse_join_column] {
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return std::make_unique<relation_value_type>(join_column, inverse_join_column);
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};
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auto node = schema_node::make_relation_node<relation_value_type>(schema_.schema(), id, std::move(creator));
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auto local_endpoint = std::make_shared<relation_endpoint>(id, relation_type::HAS_MANY, nodes_.top());
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auto join_endpoint = std::make_shared<relation_endpoint>(join_column, relation_type::BELONGS_TO, node);
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auto inverse_join_endpoint = std::make_shared<relation_endpoint>(inverse_join_column, relation_type::BELONGS_TO,
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node);
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nodes_.top()->info_->register_relation_endpoint(typeid(typename CollectionType::value_type::value_type), local_endpoint);
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node->info_->register_relation_endpoint(nodes_.top()->type_index(), join_endpoint);
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link_relation_endpoints(local_endpoint, join_endpoint);
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node->info_->register_relation_endpoint(typeid(typename CollectionType::value_type::value_type),
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inverse_join_endpoint);
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result = schema_.attach_node(node);
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if (!result) {
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// Todo: throw internal error
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return;
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}
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}
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}
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template<typename Type>
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template<class CollectionType>
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void relation_completer<Type>::on_has_many_to_many(const char *id,
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CollectionType &collection,
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const utils::foreign_attributes &attr) {
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const auto join_columns = join_columns_collector_.collect<typename CollectionType::value_type::value_type>();
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on_has_many_to_many(
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id,
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collection,
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join_columns.inverse_join_column.c_str(),
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join_columns.join_column.c_str(),
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attr);
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}
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template<typename Type>
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template<class ForeignPointerType>
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void relation_completer<Type>::on_has_one(const char *id,
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ForeignPointerType &/*obj*/,
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const utils::foreign_attributes &/*attr*/) {
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const auto ti = std::type_index(typeid(typename ForeignPointerType::value_type));
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if (const auto result = schema_.find_node(ti); !result) {
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// Node was not found
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// Create node without the foreign relation endpoint
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log_.debug("node '%s' has foreign key '%s' has one '%s'", nodes_.top()->name().c_str(), id, ti.name());
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nodes_.top()->info_->
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register_relation_endpoint(ti, std::make_shared<relation_endpoint>(id, relation_type::HAS_ONE, nodes_.top()));
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} else {
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const auto &foreign_node = result.value();
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if (const auto it = foreign_node->info().find_relation_endpoint(nodes_.top()->type_index());
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it != foreign_node->info().endpoint_end()) {
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if (it->second->is_belongs_to()) {
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it->second->node_ = foreign_node;
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const auto endpoint = std::make_shared<relation_endpoint>(id, relation_type::HAS_ONE, nodes_.top());
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nodes_.top()->info_->register_relation_endpoint(ti, endpoint);
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link_relation_endpoints(endpoint, it->second);
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} else {
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// Todo: Throw internal error
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return;
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}
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}
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}
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}
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template<typename Type>
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template<class ForeignPointerType>
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void relation_completer<Type>::on_belongs_to(const char *id,
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ForeignPointerType & /*obj*/,
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const utils::foreign_attributes & /*attr*/) {
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using value_type = typename ForeignPointerType::value_type;
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const auto ti = std::type_index(typeid(value_type));
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if (auto result = schema_.find_node(ti); !result) {
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// Type was not found
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// Create node without the foreign relation endpoint
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log_.debug("node '%s' has foreign key '%s' belongs to '%s'", nodes_.top()->name().c_str(), id, ti.name());
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nodes_.top()->info_->register_relation_endpoint(
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ti, std::make_shared<relation_endpoint>(id, relation_type::BELONGS_TO, node_ptr{}));
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} else {
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// Type was found
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const auto &foreign_node = result.value();
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// Check foreign node and relation endpoint
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if (const auto it = foreign_node->info_->find_relation_endpoint(nodes_.top()->type_index());
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it != foreign_node->info().endpoint_end()) {
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// Found corresponding relation endpoint in the foreign node
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if (it->second->is_has_one()) {
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const auto endpoint = std::make_shared<relation_endpoint>(id, relation_type::BELONGS_TO, nodes_.top());
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nodes_.top()->info_->register_relation_endpoint(ti, endpoint);
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link_relation_endpoints(endpoint, it->second);
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} else if (it->second->foreign_endpoint()->node().type_index() == typeid(many_to_many_relation<Type, value_type>)) {
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// Endpoint is a "many_to_many_relation". This means there
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// is a "many_to_many_relation" node attached. Because of being a
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// "belongs_to"-relation the "many_to_many_relation" can be removed
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// (detach), and the endpoints must be adjusted
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const auto foreign_endpoint = it->second->foreign_endpoint();
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const auto detach_result = schema_.detach_node(foreign_endpoint->node_);
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foreign_endpoint->node_ = nodes_.top();
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nodes_.top()->info_->register_relation_endpoint(nodes_.top()->type_index(), foreign_endpoint);
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} else {
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// check type
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}
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} else {
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// Relation node was not found, create only endpoint.
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const auto endpoint = std::make_shared<relation_endpoint>(id, relation_type::BELONGS_TO, nodes_.top());
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nodes_.top()->info_->register_relation_endpoint(ti, endpoint);
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}
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}
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}
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template<typename Type>
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void relation_completer<Type>::register_relation_endpoints(const endpoint_ptr &endpoint,
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const endpoint_ptr &other_endpoint) {
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endpoint->node_->info_->register_relation_endpoint(other_endpoint->node_->type_index(), endpoint);
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other_endpoint->node_->info_->register_relation_endpoint(endpoint->node_->type_index(), other_endpoint);
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link_relation_endpoints(endpoint, other_endpoint);
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}
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template<typename Type>
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void relation_completer<Type>::link_relation_endpoints(const endpoint_ptr &endpoint, const endpoint_ptr &other_endpoint) {
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endpoint->link_foreign_endpoint(other_endpoint);
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other_endpoint->link_foreign_endpoint(endpoint);
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}
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}
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#endif //RELATION_COMPLETER_HPP
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