mirror of https://gitee.com/bigwinds/arangodb
102 lines
3.6 KiB
C++
102 lines
3.6 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_MMFILES_PATH_BASED_INDEX_H
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#define ARANGOD_MMFILES_PATH_BASED_INDEX_H 1
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#include "Basics/Common.h"
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#include "MMFiles/MMFilesIndex.h"
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#include "VocBase/voc-types.h"
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#include "VocBase/vocbase.h"
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namespace arangodb {
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namespace aql {
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enum AstNodeType : uint32_t;
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}
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class FixedSizeAllocator;
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class MMFilesPathBasedIndex : public MMFilesIndex {
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public:
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MMFilesPathBasedIndex() = delete;
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MMFilesPathBasedIndex(TRI_idx_iid_t iid, arangodb::LogicalCollection& collection,
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arangodb::velocypack::Slice const& info,
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size_t baseSize, bool allowPartialIndex);
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~MMFilesPathBasedIndex();
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void toVelocyPackFigures(arangodb::velocypack::Builder&) const override;
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void toVelocyPack(arangodb::velocypack::Builder& builder,
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std::underlying_type<Index::Serialize>::type) const override;
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/// @brief return the attribute paths
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std::vector<std::vector<std::string>> const& paths() const { return _paths; }
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/// @brief return the attribute paths, a -1 entry means none is expanding,
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/// otherwise the non-negative number is the index of the expanding one.
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std::vector<int> const& expanding() const { return _expanding; }
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void load() override {}
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protected:
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/// @brief helper function to insert a document into any index type
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template <typename T>
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int fillElement(std::vector<T*>& elements, LocalDocumentId const& documentId,
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arangodb::velocypack::Slice const&);
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/// @brief return the number of paths
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inline size_t numPaths() const { return _paths.size(); }
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private:
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/// @brief helper function to transform AttributeNames into string lists
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void fillPaths(std::vector<std::vector<std::string>>& paths, std::vector<int>& expanding);
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/// @brief helper function to create a set of index combinations to insert
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std::vector<std::pair<velocypack::Slice, uint32_t>> buildIndexValue(velocypack::Slice const documentSlice);
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/// @brief helper function to create a set of index combinations to insert
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void buildIndexValues(velocypack::Slice const document, size_t level,
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std::vector<std::vector<std::pair<velocypack::Slice, uint32_t>>>& toInsert,
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std::vector<std::pair<velocypack::Slice, uint32_t>>& sliceStack);
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protected:
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std::unique_ptr<FixedSizeAllocator> _allocator;
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/// @brief the attribute paths
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std::vector<std::vector<std::string>> _paths;
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/// @brief ... and which of them expands
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std::vector<int> _expanding;
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/// @brief whether or not array indexes will de-duplicate their input values
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bool _deduplicate;
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/// @brief whether or not partial indexing is allowed
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bool _allowPartialIndex;
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};
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} // namespace arangodb
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#endif
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