mirror of https://gitee.com/bigwinds/arangodb
181 lines
7.0 KiB
C++
181 lines
7.0 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief Aql, variable generator
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2014 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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/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
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/// @author Copyright 2012-2013, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_AQL_VARIABLE_GENERATOR_H
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#define ARANGODB_AQL_VARIABLE_GENERATOR_H 1
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#include "Basics/Common.h"
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#include "Basics/JsonHelper.h"
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#include "Aql/Variable.h"
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#include "Aql/types.h"
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namespace triagens {
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namespace aql {
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// -----------------------------------------------------------------------------
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// --SECTION-- class VariableGenerator
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// -----------------------------------------------------------------------------
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class VariableGenerator {
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors / destructors
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// -----------------------------------------------------------------------------
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public:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief create the generator
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////////////////////////////////////////////////////////////////////////////////
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VariableGenerator ();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destroy the generator
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////////////////////////////////////////////////////////////////////////////////
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~VariableGenerator ();
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// -----------------------------------------------------------------------------
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// --SECTION-- public methods
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// -----------------------------------------------------------------------------
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public:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return a map of all variable ids with their names
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////////////////////////////////////////////////////////////////////////////////
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std::unordered_map<VariableId, std::string const> variables (bool) const;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief generate a variable
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////////////////////////////////////////////////////////////////////////////////
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Variable* createVariable (char const*,
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size_t,
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bool);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief generate a variable
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////////////////////////////////////////////////////////////////////////////////
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Variable* createVariable (std::string const&,
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bool);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief generate a variable from JSON
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////////////////////////////////////////////////////////////////////////////////
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Variable* createVariable (triagens::basics::Json const&);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief clones a variable from an existing one
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////////////////////////////////////////////////////////////////////////////////
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Variable* createVariable (Variable const*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief generate a temporary variable
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////////////////////////////////////////////////////////////////////////////////
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Variable* createTemporaryVariable ();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return a variable by id - this does not respect the scopes!
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////////////////////////////////////////////////////////////////////////////////
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Variable* getVariable (VariableId) const;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return the next temporary variable name
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////////////////////////////////////////////////////////////////////////////////
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std::string nextName ();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief export to JSON, returns an AUTOFREE Json object
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////////////////////////////////////////////////////////////////////////////////
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triagens::basics::Json toJson (TRI_memory_zone_t*) const;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief import from JSON
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////////////////////////////////////////////////////////////////////////////////
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void fromJson (triagens::basics::Json const& jsonAllVariablesList);
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// -----------------------------------------------------------------------------
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// --SECTION-- private functions
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// -----------------------------------------------------------------------------
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private:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief returns the next variable id
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////////////////////////////////////////////////////////////////////////////////
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inline VariableId nextId () {
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return _id++;
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- private variables
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// -----------------------------------------------------------------------------
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private:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief all variables created
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////////////////////////////////////////////////////////////////////////////////
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std::unordered_map<VariableId, Variable*> _variables;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief the next assigned variable id
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////////////////////////////////////////////////////////////////////////////////
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VariableId _id;
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};
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}
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}
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#endif
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// -----------------------------------------------------------------------------
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// --SECTION-- END-OF-FILE
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// -----------------------------------------------------------------------------
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "/// @brief\\|/// {@inheritDoc}\\|/// @page\\|// --SECTION--\\|/// @\\}"
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// End:
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