mirror of https://gitee.com/bigwinds/arangodb
117 lines
3.1 KiB
C++
117 lines
3.1 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief Library to build up VPack documents.
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///
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/// DISCLAIMER
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///
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/// Copyright 2015 ArangoDB GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Max Neunhoeffer
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/// @author Jan Steemann
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/// @author Copyright 2015, ArangoDB GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#ifndef VELOCYPACK_ATTRIBUTETRANSLATOR_H
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#define VELOCYPACK_ATTRIBUTETRANSLATOR_H 1
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#include <cstdint>
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#include <memory>
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#include <string>
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#include <unordered_map>
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#include "velocypack/velocypack-common.h"
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#include "velocypack/StringRef.h"
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namespace arangodb {
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namespace velocypack {
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class Builder;
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class AttributeTranslator {
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public:
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AttributeTranslator(AttributeTranslator const&) = delete;
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AttributeTranslator& operator=(AttributeTranslator const&) = delete;
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AttributeTranslator();
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~AttributeTranslator();
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std::size_t count() const { return _count; }
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void add(std::string const& key, uint64_t id);
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void seal();
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Builder* builder() const { return _builder.get(); }
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// translate from string to id
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uint8_t const* translate(StringRef const& key) const noexcept {
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auto it = _keyToId.find(key);
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if (it == _keyToId.end()) {
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return nullptr;
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}
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return (*it).second;
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}
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// translate from string to id
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inline uint8_t const* translate(std::string const& key) const noexcept {
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return translate(StringRef(key.data(), key.size()));
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}
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// translate from string to id
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inline uint8_t const* translate(char const* key, ValueLength length) const noexcept {
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return translate(StringRef(key, length));
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}
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// translate from id to string
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uint8_t const* translate(uint64_t id) const noexcept {
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auto it = _idToKey.find(id);
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if (it == _idToKey.end()) {
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return nullptr;
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}
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return (*it).second;
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}
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private:
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std::unique_ptr<Builder> _builder;
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std::unordered_map<StringRef, uint8_t const*> _keyToId;
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std::unordered_map<uint64_t, uint8_t const*> _idToKey;
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std::size_t _count;
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};
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class AttributeTranslatorScope {
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private:
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AttributeTranslatorScope(AttributeTranslatorScope const&) = delete;
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AttributeTranslatorScope& operator= (AttributeTranslatorScope const&) = delete;
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public:
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explicit AttributeTranslatorScope(AttributeTranslator* translator);
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~AttributeTranslatorScope();
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void revert() noexcept;
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private:
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AttributeTranslator* _old;
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};
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} // namespace arangodb::velocypack
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} // namespace arangodb
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#endif
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