mirror of https://gitee.com/bigwinds/arangodb
176 lines
6.2 KiB
C++
176 lines
6.2 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief AQL, expression
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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 2010-2014 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 triAGENS GmbH, Cologne, Germany
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///
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/// @author Max Neunhoeffer
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/// @author Copyright 2014, triagens GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_AQL_EXPRESSION_H
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#define ARANGODB_AQL_EXPRESSION_H 1
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#include "Basics/Common.h"
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#include "Aql/AstNode.h"
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#include "Aql/Types.h"
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#include "Basics/JsonHelper.h"
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#include "Utils/AqlTransaction.h"
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struct TRI_json_s;
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namespace triagens {
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namespace basics {
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class Json;
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}
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namespace aql {
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class AqlItemBlock;
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struct AqlValue;
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struct Variable;
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class V8Executor;
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struct V8Expression;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief AqlExpression, used in execution plans and execution blocks
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////////////////////////////////////////////////////////////////////////////////
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class Expression {
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enum ExpressionType {
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UNPROCESSED,
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JSON,
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V8
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};
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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 constructor, using an AST start node
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////////////////////////////////////////////////////////////////////////////////
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Expression (V8Executor*,
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AstNode const*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destructor
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////////////////////////////////////////////////////////////////////////////////
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~Expression ();
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// -----------------------------------------------------------------------------
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// --SECTION-- public functions
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief get the underlying AST node
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////////////////////////////////////////////////////////////////////////////////
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inline AstNode const* node () {
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return _node;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief clone the expression, needed to clone execution plans
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////////////////////////////////////////////////////////////////////////////////
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Expression* clone () {
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// We do not need to copy the _ast, since it is managed by the
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// query object and the memory management of the ASTs
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return new Expression(_executor, _node);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return all variables used in the expression
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////////////////////////////////////////////////////////////////////////////////
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std::unordered_set<Variable*> variables () const;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return a Json representation of the expression
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////////////////////////////////////////////////////////////////////////////////
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triagens::basics::Json toJson (TRI_memory_zone_t* zone) const {
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return triagens::basics::Json(zone, _node->toJson(zone));
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief execute the expression
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////////////////////////////////////////////////////////////////////////////////
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AqlValue execute (AQL_TRANSACTION_V8* trx,
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std::vector<TRI_document_collection_t const*>&,
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std::vector<AqlValue>&, size_t,
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std::vector<Variable*> const&,
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std::vector<RegisterId> const&);
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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 the V8 executor
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////////////////////////////////////////////////////////////////////////////////
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V8Executor* _executor;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief the AST node that contains the expression to execute
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////////////////////////////////////////////////////////////////////////////////
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AstNode const* _node;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief a v8 function that will be executed for the expression
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/// if the expression is a constant, it will be stored as plain JSON instead
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////////////////////////////////////////////////////////////////////////////////
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union {
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V8Expression* _func;
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struct TRI_json_s* _data;
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};
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////////////////////////////////////////////////////////////////////////////////
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/// @brief type of expression
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////////////////////////////////////////////////////////////////////////////////
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ExpressionType _type;
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};
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} // namespace triagens::aql
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} // namespace triagens
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#endif
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "^\\(/// @brief\\|/// {@inheritDoc}\\|/// @addtogroup\\|// --SECTION--\\|/// @\\}\\)"
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// End:
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