mirror of https://gitee.com/bigwinds/arangodb
97 lines
3.0 KiB
C++
97 lines
3.0 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS 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 Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_VARIABLE_GENERATOR_H
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#define ARANGOD_AQL_VARIABLE_GENERATOR_H 1
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#include "Aql/Variable.h"
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#include "Aql/types.h"
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#include "Basics/Common.h"
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namespace arangodb {
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namespace aql {
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class VariableGenerator {
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public:
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/// @brief create the generator
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VariableGenerator();
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VariableGenerator(VariableGenerator const& other) = delete;
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VariableGenerator& operator=(VariableGenerator const& other) = delete;
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/// @brief destroy the generator
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~VariableGenerator();
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public:
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/// @brief return a map of all variable ids with their names
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std::unordered_map<VariableId, std::string const> variables(bool includeTemporaries) const;
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/// @brief generate a variable
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Variable* createVariable(char const*, size_t, bool);
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/// @brief generate a variable
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Variable* createVariable(std::string const&, bool);
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/// @brief generate a variable from VelocyPack
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Variable* createVariable(arangodb::velocypack::Slice const);
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/// @brief clones a variable from an existing one
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Variable* createVariable(Variable const*);
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/// @brief generate a temporary variable
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Variable* createTemporaryVariable();
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/// @brief renames a variable (assigns a temporary name)
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Variable* renameVariable(VariableId);
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/// @brief renames a variable (assigns the specified name)
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Variable* renameVariable(VariableId, std::string const&);
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/// @brief return a variable by id - this does not respect the scopes!
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Variable* getVariable(VariableId) const;
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/// @brief return the next temporary variable name
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std::string nextName();
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/// @brief export to VelocyPack
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void toVelocyPack(arangodb::velocypack::Builder& builder) const;
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/// @brief import from VelocyPack
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void fromVelocyPack(arangodb::velocypack::Slice const& allVariablesList);
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private:
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/// @brief returns the next variable id
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inline VariableId nextId() { return _id++; }
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private:
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/// @brief all variables created
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std::unordered_map<VariableId, Variable*> _variables;
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/// @brief the next assigned variable id
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VariableId _id;
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};
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} // namespace aql
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} // namespace arangodb
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#endif
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