mirror of https://gitee.com/bigwinds/arangodb
122 lines
4.4 KiB
C++
122 lines
4.4 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_ENUMERATE_LIST_BLOCK_H
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#define ARANGOD_AQL_ENUMERATE_LIST_BLOCK_H 1
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#include "ExecutionBlock.h"
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#include "Aql/ExecutionNode.h"
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#include "Utils/AqlTransaction.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 EnumerateListBlock : public ExecutionBlock {
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public:
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EnumerateListBlock(ExecutionEngine*, EnumerateListNode const*);
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~EnumerateListBlock();
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int initialize() override;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief initializeCursor, here we release our docs from this collection
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//////////////////////////////////////////////////////////////////////////////
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int initializeCursor(AqlItemBlock* items, size_t pos) override;
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AqlItemBlock* getSome(size_t atLeast, size_t atMost) override final;
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//////////////////////////////////////////////////////////////////////////////
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// skip between atLeast and atMost returns the number actually skipped . . .
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// will only return less than atLeast if there aren't atLeast many
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// things to skip overall.
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//////////////////////////////////////////////////////////////////////////////
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size_t skipSome(size_t atLeast, size_t atMost) override final;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief create an AqlValue from the inVariable using the current _index
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//////////////////////////////////////////////////////////////////////////////
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private:
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//////////////////////////////////////////////////////////////////////////////
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/// @brief create an AqlValue from the inVariable using the current _index
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//////////////////////////////////////////////////////////////////////////////
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AqlValue getAqlValue(AqlValue const&);
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//////////////////////////////////////////////////////////////////////////////
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/// @brief throws an "array expected" exception
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//////////////////////////////////////////////////////////////////////////////
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void throwArrayExpectedException();
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private:
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//////////////////////////////////////////////////////////////////////////////
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/// @brief current position in the _inVariable
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//////////////////////////////////////////////////////////////////////////////
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size_t _index;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief current block in DOCVEC
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//////////////////////////////////////////////////////////////////////////////
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size_t _thisBlock;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief number of elements in DOCVEC before the current block
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//////////////////////////////////////////////////////////////////////////////
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size_t _seen;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief total number of elements in DOCVEC
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//////////////////////////////////////////////////////////////////////////////
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size_t _docVecSize;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief document collection from DOCVEC
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//////////////////////////////////////////////////////////////////////////////
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TRI_document_collection_t const* _collection;
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//////////////////////////////////////////////////////////////////////////////
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/// @brief the register index containing the inVariable of the
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/// EnumerateListNode
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//////////////////////////////////////////////////////////////////////////////
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RegisterId _inVarRegId;
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};
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} // namespace arangodb::aql
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} // namespace arangodb
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#endif
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