mirror of https://gitee.com/bigwinds/arangodb
119 lines
3.8 KiB
C++
119 lines
3.8 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief AQL SortBlock
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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_SORT_BLOCK_H
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#define ARANGODB_AQL_SORT_BLOCK_H 1
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#include "Basics/Common.h"
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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-- SortBlock
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// -----------------------------------------------------------------------------
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class SortBlock : public ExecutionBlock {
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public:
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SortBlock (ExecutionEngine*,
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SortNode const*);
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~SortBlock ();
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int initialize () override;
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int initializeCursor (AqlItemBlock* items, size_t pos) override final;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief dosorting
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////////////////////////////////////////////////////////////////////////////////
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private:
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void doSorting ();
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////////////////////////////////////////////////////////////////////////////////
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/// @brief OurLessThan
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////////////////////////////////////////////////////////////////////////////////
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class OurLessThan {
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public:
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OurLessThan (triagens::arango::AqlTransaction* trx,
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std::deque<AqlItemBlock*>& buffer,
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std::vector<std::pair<RegisterId, bool>>& sortRegisters,
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std::vector<TRI_document_collection_t const*>& colls)
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: _trx(trx),
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_buffer(buffer),
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_sortRegisters(sortRegisters),
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_colls(colls) {
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}
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bool operator() (std::pair<size_t, size_t> const& a,
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std::pair<size_t, size_t> const& b);
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private:
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triagens::arango::AqlTransaction* _trx;
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std::deque<AqlItemBlock*>& _buffer;
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std::vector<std::pair<RegisterId, bool>>& _sortRegisters;
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std::vector<TRI_document_collection_t const*>& _colls;
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};
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////////////////////////////////////////////////////////////////////////////////
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/// @brief pairs, consisting of variable and sort direction
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/// (true = ascending | false = descending)
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////////////////////////////////////////////////////////////////////////////////
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std::vector<std::pair<RegisterId, bool>> _sortRegisters;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief whether or not the sort should be stable
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////////////////////////////////////////////////////////////////////////////////
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bool _stable;
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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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