mirror of https://gitee.com/bigwinds/arangodb
60 lines
2.1 KiB
C++
60 lines
2.1 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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#include "CollectionScanner.h"
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#include "Basics/VelocyPackHelper.h"
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using namespace arangodb::aql;
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CollectionScanner::CollectionScanner(arangodb::AqlTransaction* trx,
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std::string const& collection,
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bool readRandom)
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: _cursor(trx->indexScan(collection,
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(readRandom ? Transaction::CursorType::ANY
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: Transaction::CursorType::ALL),
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Transaction::IndexHandle(), VPackSlice(), 0,
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UINT64_MAX, 1000, false)) {
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TRI_ASSERT(_cursor->successful());
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}
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CollectionScanner::~CollectionScanner() {}
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VPackSlice CollectionScanner::scan(size_t batchSize) {
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if (!_cursor->hasMore()) {
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return arangodb::basics::VelocyPackHelper::EmptyArrayValue();
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}
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_cursor->getMore(_currentBatch, batchSize, true);
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if (_currentBatch->failed()) {
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return arangodb::basics::VelocyPackHelper::EmptyArrayValue();
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}
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return _currentBatch->slice();
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}
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int CollectionScanner::forward(size_t batchSize, uint64_t& skipped) {
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return _cursor->skip(batchSize, skipped);
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}
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void CollectionScanner::reset() {
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_cursor->reset();
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}
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