mirror of https://gitee.com/bigwinds/arangodb
123 lines
4.2 KiB
C++
123 lines
4.2 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief AQL SubqueryBlock
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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_SUBQUERY_BLOCK_H
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#define ARANGODB_AQL_SUBQUERY_BLOCK_H 1
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#include "Aql/ExecutionBlock.h"
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#include "Aql/ExecutionNode.h"
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#include "Utils/AqlTransaction.h"
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namespace triagens {
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namespace aql {
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class AqlItemBlock;
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class ExecutionEngine;
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// -----------------------------------------------------------------------------
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// --SECTION-- SubqueryBlock
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// -----------------------------------------------------------------------------
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class SubqueryBlock : public ExecutionBlock {
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public:
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SubqueryBlock (ExecutionEngine*,
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SubqueryNode const*,
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ExecutionBlock*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destructor
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////////////////////////////////////////////////////////////////////////////////
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~SubqueryBlock ();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief initialize, tell dependency and the subquery
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////////////////////////////////////////////////////////////////////////////////
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int initialize () override;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief getSome
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////////////////////////////////////////////////////////////////////////////////
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AqlItemBlock* getSome (size_t atLeast,
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size_t atMost) override final;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief shutdown, tell dependency and the subquery
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////////////////////////////////////////////////////////////////////////////////
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int shutdown (int errorCode) override final;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief getter for the pointer to the subquery
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////////////////////////////////////////////////////////////////////////////////
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ExecutionBlock* getSubquery() {
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return _subquery;
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}
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private:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief execute the subquery and return its results
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////////////////////////////////////////////////////////////////////////////////
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std::vector<AqlItemBlock*>* executeSubquery ();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destroy the results of a subquery
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////////////////////////////////////////////////////////////////////////////////
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void destroySubqueryResults (std::vector<AqlItemBlock*>*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief output register
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////////////////////////////////////////////////////////////////////////////////
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RegisterId _outReg;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief we need to have an executionblock and where to write the result
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////////////////////////////////////////////////////////////////////////////////
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ExecutionBlock* _subquery;
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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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