69a385fd9d
Schema related files are moved there. This excludes schema files that also interact with mutations, because the mutation module depends on the schema. Those files will have to go into a separate module. Closes #12858
61 lines
2.6 KiB
C++
61 lines
2.6 KiB
C++
/*
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* Copyright (C) 2015-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include "atomic_cell.hh"
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#include "collection_mutation.hh"
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#include "schema/schema.hh"
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// A variant type that can hold either an atomic_cell, or a serialized collection.
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// Which type is stored is determined by the schema.
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// Has an "empty" state.
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// Objects moved-from are left in an empty state.
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class atomic_cell_or_collection final {
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managed_bytes _data;
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private:
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atomic_cell_or_collection(managed_bytes&& data) : _data(std::move(data)) {}
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public:
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atomic_cell_or_collection() = default;
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atomic_cell_or_collection(atomic_cell_or_collection&&) = default;
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atomic_cell_or_collection(const atomic_cell_or_collection&) = delete;
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atomic_cell_or_collection& operator=(atomic_cell_or_collection&&) = default;
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atomic_cell_or_collection& operator=(const atomic_cell_or_collection&) = delete;
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atomic_cell_or_collection(atomic_cell ac) : _data(std::move(ac._data)) {}
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atomic_cell_or_collection(const abstract_type& at, atomic_cell_view acv);
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static atomic_cell_or_collection from_atomic_cell(atomic_cell data) { return { std::move(data._data) }; }
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atomic_cell_view as_atomic_cell(const column_definition& cdef) const { return atomic_cell_view::from_bytes(*cdef.type, _data); }
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atomic_cell_mutable_view as_mutable_atomic_cell(const column_definition& cdef) { return atomic_cell_mutable_view::from_bytes(*cdef.type, _data); }
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atomic_cell_or_collection(collection_mutation cm) : _data(std::move(cm._data)) { }
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atomic_cell_or_collection copy(const abstract_type&) const;
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explicit operator bool() const {
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return !_data.empty();
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}
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static constexpr bool can_use_mutable_view() {
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return true;
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}
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static atomic_cell_or_collection from_collection_mutation(collection_mutation data) { return std::move(data._data); }
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collection_mutation_view as_collection_mutation() const;
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bytes_view serialize() const;
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bool equals(const abstract_type& type, const atomic_cell_or_collection& other) const;
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size_t external_memory_usage(const abstract_type&) const;
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class printer {
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const column_definition& _cdef;
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const atomic_cell_or_collection& _cell;
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public:
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printer(const column_definition& cdef, const atomic_cell_or_collection& cell)
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: _cdef(cdef), _cell(cell) { }
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printer(const printer&) = delete;
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printer(printer&&) = delete;
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friend std::ostream& operator<<(std::ostream&, const printer&);
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};
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friend std::ostream& operator<<(std::ostream&, const printer&);
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};
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