mirror of https://gitee.com/bigwinds/arangodb
94 lines
2.8 KiB
C++
94 lines
2.8 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_COLLECTION_BLOCK_H
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#define ARANGOD_AQL_ENUMERATE_COLLECTION_BLOCK_H 1
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#include "Aql/CollectionScanner.h"
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#include "Aql/ExecutionBlock.h"
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#include "Aql/ExecutionNode.h"
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#include <velocypack/Iterator.h>
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#include <velocypack/Slice.h>
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struct TRI_doc_mptr_t;
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namespace arangodb {
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namespace aql {
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class AqlItemBlock;
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struct Collection;
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class CollectionScanner;
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class ExecutionEngine;
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class EnumerateCollectionBlock : public ExecutionBlock {
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public:
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EnumerateCollectionBlock(ExecutionEngine* engine,
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EnumerateCollectionNode const* ep);
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~EnumerateCollectionBlock() = default;
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/// @brief initialize fetching of documents
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void initializeDocuments();
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/// @brief skip instead of fetching
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bool skipDocuments(size_t toSkip, size_t& skipped);
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/// @brief continue fetching of documents
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bool moreDocuments(size_t hint);
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/// @brief initialize, here we fetch all docs from the database
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int initialize() override final;
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/// @brief initializeCursor
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int initializeCursor(AqlItemBlock* items, size_t pos) override;
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/// @brief getSome
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AqlItemBlock* getSome(size_t atLeast, size_t atMost) override final;
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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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size_t skipSome(size_t atLeast, size_t atMost) override final;
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private:
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/// @brief collection
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Collection* _collection;
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/// @brief collection scanner
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CollectionScanner _scanner;
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/// @brief iterator over documents
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arangodb::velocypack::ArrayIterator _iterator;
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/// @brief document buffer
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arangodb::velocypack::Slice _documents;
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/// @brief whether or not the enumerated documents need to be stored
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bool _mustStoreResult;
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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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