mirror of https://gitee.com/bigwinds/arangodb
91 lines
3.0 KiB
C++
91 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_V8_EXPRESSION_H
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#define ARANGOD_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 arangodb {
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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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struct V8Expression {
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/// @brief create the v8 expression
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V8Expression(v8::Isolate*, v8::Handle<v8::Function>, v8::Handle<v8::Object>,
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bool);
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/// @brief destroy the v8 expression
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~V8Expression();
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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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void setAttributeRestrictions(std::unordered_map<
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Variable const*, std::unordered_set<std::string>> const&
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attributeRestrictions) {
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_attributeRestrictions = attributeRestrictions;
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}
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/// @brief execute the expression
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AqlValue execute(v8::Isolate* isolate, Query* query,
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arangodb::AqlTransaction*, AqlItemBlock const*, size_t,
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std::vector<Variable const*> const&,
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std::vector<RegisterId> const&, bool& mustDestroy);
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/// @brief the isolate used when executing and destroying the expression
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v8::Isolate* isolate;
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/// @brief the compiled expression as a V8 function
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v8::Persistent<v8::Function> _func;
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/// @brief constants
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v8::Persistent<v8::Object> _constantValues;
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/// @brief restrictions for creating the input values
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std::unordered_map<Variable const*, std::unordered_set<std::string>>
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_attributeRestrictions;
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/// @brief number of times the expression was executed
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size_t _numExecutions;
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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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bool const _isSimple;
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};
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}
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}
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#endif
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