99 lines
2.6 KiB
C++
99 lines
2.6 KiB
C++
#pragma once
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#include "database/db_transaction.hpp"
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#include "storage/vertex_accessor.hpp"
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#include "utils/border.hpp"
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#include "utils/option.hpp"
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namespace tx
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{
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class Transaction;
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}
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/*
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* DbAccessor
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* -Guarantees that access to Vertex and Edge is possible only through
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* Vertex::Accessor and Edge::Accessor.
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* -Guarantees that changing Vertex and Edge is possible only using
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* Vertex::Accessor returned by vertex_insert() method and
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* Edge::Accessor returned by edge_insert() method.
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* -Offers CRUD for Vertex and Edge except iterating over all edges.
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*
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* Vertex::Accessor
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* By default Vertex::accessor is empty. Caller has to call fill() method
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* to fetch valid data and check it's return value. fill() method returns
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* true if there is valid data for current transaction false otherwise.
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* Only exception to this rule is vertex_insert() method in DbAccessor
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* which returns by default filled Vertex::Accessor.
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*
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* Edge::Accessor
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* By default Edge::accessor is empty. Caller has to call fill() method
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* to
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* fetch valid data and check it's return value. fill() method returns
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* true
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* if there is valid data for current transaction false otherwise.
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* Only exception to this rule is edge_insert() method in DbAccessor
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* which
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* returns by default filled Edge::Accessor.
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*/
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class DbAccessor
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{
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public:
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DbAccessor(Db &db);
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//*******************VERTEX METHODS
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auto vertex_access();
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Option<const Vertex::Accessor> vertex_find(const Id &id);
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// Creates new Vertex and returns filled Vertex::Accessor.
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Vertex::Accessor vertex_insert();
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// ******************* EDGE METHODS
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Option<const Edge::Accessor> edge_find(const Id &id);
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// Creates new Edge and returns filled Edge::Accessor.
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Edge::Accessor edge_insert(Vertex::Accessor const &from,
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Vertex::Accessor const &to);
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// ******************* LABEL METHODS
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const Label &label_find_or_create(const std::string &name);
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bool label_contains(const std::string &name);
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// ******************** TYPE METHODS
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const EdgeType &type_find_or_create(const std::string &name);
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bool type_contains(const std::string &name);
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// ******************** PROPERTY METHODS
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PropertyFamily &vertex_property_family_get(const std::string &name);
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PropertyFamily &edge_property_family_get(const std::string &name);
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// ******************** TRANSACTION METHODS
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void commit();
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void abort();
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private:
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template <class T, class K>
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friend class NonUniqueUnorderedIndex;
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DbTransaction db_transaction;
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};
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// ********************** CONVENIENT FUNCTIONS
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template <class R>
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bool option_fill(Option<R> &o)
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{
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return o.is_present() && o.get().fill();
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}
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