115 lines
3.5 KiB
C++
115 lines
3.5 KiB
C++
// Copyright 2022 Memgraph Ltd.
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//
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// Use of this software is governed by the Business Source License
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// included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
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// License, and you may not use this file except in compliance with the Business Source License.
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//
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// As of the Change Date specified in that file, in accordance with
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// the Business Source License, use of this software will be governed
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// by the Apache License, Version 2.0, included in the file
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// licenses/APL.txt.
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#pragma once
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#include <optional>
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#include "storage/v3/edge.hpp"
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#include "storage/v3/edge_ref.hpp"
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#include "storage/v3/config.hpp"
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#include "storage/v3/id_types.hpp"
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#include "storage/v3/result.hpp"
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#include "storage/v3/schema_validator.hpp"
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#include "storage/v3/transaction.hpp"
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#include "storage/v3/view.hpp"
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namespace memgraph::storage::v3 {
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class VertexAccessor;
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struct Indices;
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class EdgeAccessor final {
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private:
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friend class Shard;
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public:
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EdgeAccessor(EdgeRef edge, EdgeTypeId edge_type, VertexId from_vertex, VertexId to_vertex, Transaction *transaction,
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Indices *indices, Config::Items config, bool for_deleted = false)
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: edge_(edge),
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edge_type_(edge_type),
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from_vertex_(std::move(from_vertex)),
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to_vertex_(std::move(to_vertex)),
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transaction_(transaction),
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indices_(indices),
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config_(config),
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for_deleted_(for_deleted) {}
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/// @return true if the object is visible from the current transaction
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bool IsVisible(View view) const;
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const VertexId &From() const;
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const VertexId &To() const;
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EdgeTypeId EdgeType() const { return edge_type_; }
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/// Set a property value and return the old value.
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/// @throw std::bad_alloc
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ShardResult<PropertyValue> SetProperty(PropertyId property, const PropertyValue &value);
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/// Remove all properties and return old values for each removed property.
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/// @throw std::bad_alloc
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ShardResult<std::map<PropertyId, PropertyValue>> ClearProperties();
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/// @throw std::bad_alloc
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ShardResult<PropertyValue> GetProperty(PropertyId property, View view) const;
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ShardResult<PropertyValue> GetProperty(View view, PropertyId property) const;
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/// @throw std::bad_alloc
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ShardResult<std::map<PropertyId, PropertyValue>> Properties(View view) const;
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Gid Gid() const noexcept {
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if (config_.properties_on_edges) {
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return edge_.ptr->gid;
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}
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return edge_.gid;
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}
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bool IsCycle() const { return from_vertex_ == to_vertex_; }
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bool operator==(const EdgeAccessor &other) const noexcept {
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return edge_ == other.edge_ && transaction_ == other.transaction_;
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}
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bool operator!=(const EdgeAccessor &other) const noexcept { return !(*this == other); }
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// Dummy function
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size_t CypherId() const;
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private:
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EdgeRef edge_;
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EdgeTypeId edge_type_;
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VertexId from_vertex_;
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VertexId to_vertex_;
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Transaction *transaction_;
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Indices *indices_;
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Config::Items config_;
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// if the accessor was created for a deleted edge.
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// Accessor behaves differently for some methods based on this
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// flag.
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// E.g. If this field is set to true, GetProperty will return the property of the edge
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// even though the edge is deleted.
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// All the write operations will still return an error if it's called for a deleted edge.
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bool for_deleted_{false};
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};
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} // namespace memgraph::storage::v3
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namespace std {
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template <>
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struct hash<memgraph::storage::v3::EdgeAccessor> {
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size_t operator()(const memgraph::storage::v3::EdgeAccessor &e) const { return e.Gid().AsUint(); }
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};
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} // namespace std
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