mirror of https://gitee.com/bigwinds/arangodb
85 lines
2.4 KiB
C++
85 lines
2.4 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 Max Neunhoeffer
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_AQL_CALCULATION_BLOCK_H
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#define ARANGOD_AQL_CALCULATION_BLOCK_H 1
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#include "Aql/ExecutionBlock.h"
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#include "Aql/ExecutionNode.h"
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namespace arangodb {
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namespace aql {
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class AqlItemBlock;
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class ExecutionEngine;
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class CalculationBlock final : public ExecutionBlock {
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public:
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CalculationBlock(ExecutionEngine*, CalculationNode const*);
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~CalculationBlock();
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private:
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/// @brief fill the target register in the item block with a reference to
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/// another variable
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void fillBlockWithReference(AqlItemBlock*);
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/// @brief shared code for executing a simple or a V8 expression
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void executeExpression(AqlItemBlock*);
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/// @brief doEvaluation, private helper to do the work
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void doEvaluation(AqlItemBlock*);
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public:
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/// @brief getSome
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std::pair<ExecutionState, std::unique_ptr<AqlItemBlock>> getSome(size_t atMost) override final;
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private:
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/// @brief we hold a pointer to the expression in the plan
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Expression* _expression;
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/// @brief info about input variables
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std::vector<Variable const*> _inVars;
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/// @brief info about input registers
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std::vector<RegisterId> _inRegs;
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/// @brief output register
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RegisterId _outReg;
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/// @brief condition variable register
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RegisterId _conditionReg;
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/// @brief whether or not the expression is a simple variable reference
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bool _isReference;
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/// @brief cache the ServerState value
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bool _isRunningInCluster;
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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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