mirror of https://gitee.com/bigwinds/arangodb
149 lines
6.0 KiB
C++
149 lines
6.0 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief Aql, V8 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 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_V8_EXPRESSION_H
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#define ARANGODB_AQL_V8_EXPRESSION_H 1
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#include "Basics/Common.h"
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#include "Aql/AqlValue.h"
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#include "Aql/types.h"
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#include <v8.h>
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namespace triagens {
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namespace aql {
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class AqlItemBlock;
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class Query;
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struct Variable;
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// -----------------------------------------------------------------------------
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// --SECTION-- struct V8Expression
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// -----------------------------------------------------------------------------
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struct V8Expression {
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors / destructors
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief create the v8 expression
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////////////////////////////////////////////////////////////////////////////////
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V8Expression (v8::Isolate*,
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v8::Handle<v8::Function>,
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v8::Handle<v8::Object>,
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bool);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destroy the v8 expression
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////////////////////////////////////////////////////////////////////////////////
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~V8Expression ();
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// -----------------------------------------------------------------------------
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// --SECTION-- public methods
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief sets attribute restrictions. these prevent input variables to be
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/// fully constructed as V8 objects (which can be very expensive), but limits
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/// the objects to the actually used attributes only.
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/// For example, the expression LET x = a.value + 1 will not build the full
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/// object for "a", but only its "value" attribute
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////////////////////////////////////////////////////////////////////////////////
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void setAttributeRestrictions (std::unordered_map<Variable const*, std::unordered_set<std::string>> const& attributeRestrictions) {
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_attributeRestrictions = attributeRestrictions;
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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 (v8::Isolate* isolate,
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Query* query,
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triagens::arango::AqlTransaction*,
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AqlItemBlock const*,
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size_t,
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std::vector<Variable const*> const&,
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std::vector<RegisterId> const&);
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// -----------------------------------------------------------------------------
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// --SECTION-- public variables
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief the isolate used when executing and destroying the expression
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////////////////////////////////////////////////////////////////////////////////
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v8::Isolate* isolate;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief the compiled expression as a V8 function
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////////////////////////////////////////////////////////////////////////////////
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v8::Persistent<v8::Function> _func;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief constants
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////////////////////////////////////////////////////////////////////////////////
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v8::Persistent<v8::Object> _constantValues;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief restrictions for creating the input values
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////////////////////////////////////////////////////////////////////////////////
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std::unordered_map<Variable const*, std::unordered_set<std::string>> _attributeRestrictions;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief whether or not the expression is simple. simple in this case means
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/// that the expression result will always contain non-cyclic data and no
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/// special JavaScript types such as Date, RegExp, Function etc.
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////////////////////////////////////////////////////////////////////////////////
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bool const _isSimple;
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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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