mirror of https://gitee.com/bigwinds/arangodb
126 lines
3.7 KiB
C++
126 lines
3.7 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 Michael Hackstein
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////////////////////////////////////////////////////////////////////////////////
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#include "OperationCursor.h"
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#include "Basics/Exceptions.h"
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#include "Logger/Logger.h"
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#include "OperationResult.h"
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#include "VocBase/LogicalCollection.h"
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#include "VocBase/ManagedDocumentResult.h"
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using namespace arangodb;
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LogicalCollection* OperationCursor::collection() const {
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TRI_ASSERT(_indexIterator != nullptr);
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return _indexIterator->collection();
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}
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bool OperationCursor::hasExtra() const { return indexIterator()->hasExtra(); }
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void OperationCursor::reset() {
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code = TRI_ERROR_NO_ERROR;
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if (_indexIterator != nullptr) {
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_indexIterator->reset();
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_hasMore = true;
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}
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}
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/// @brief Calls cb for the next batchSize many elements
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/// NOTE: This will throw on OUT_OF_MEMORY
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bool OperationCursor::next(IndexIterator::LocalDocumentIdCallback const& callback, uint64_t batchSize) {
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if (!hasMore()) {
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return false;
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}
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if (batchSize == UINT64_MAX) {
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batchSize = _batchSize;
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}
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size_t atMost = static_cast<size_t>(batchSize);
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_hasMore = _indexIterator->next(callback, atMost);
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return _hasMore;
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}
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bool OperationCursor::nextDocument(IndexIterator::DocumentCallback const& callback,
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uint64_t batchSize) {
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if (!hasMore()) {
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return false;
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}
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if (batchSize == UINT64_MAX) {
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batchSize = _batchSize;
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}
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size_t atMost = static_cast<size_t>(batchSize);
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_hasMore = _indexIterator->nextDocument(callback, atMost);
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return _hasMore;
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}
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//////////////////////////////////////////////////////////////////////////////
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/// @brief Calls cb for the next batchSize many elements
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/// Uses the getExtra feature of indexes. Can only be called on those
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/// who support it.
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/// NOTE: This will throw on OUT_OF_MEMORY
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//////////////////////////////////////////////////////////////////////////////
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bool OperationCursor::nextWithExtra(IndexIterator::ExtraCallback const& callback, uint64_t batchSize) {
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TRI_ASSERT(hasExtra());
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if (!hasMore()) {
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return false;
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}
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if (batchSize == UINT64_MAX) {
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batchSize = _batchSize;
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}
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size_t atMost = static_cast<size_t>(batchSize);
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_hasMore = _indexIterator->nextExtra(callback, atMost);
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return _hasMore;
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}
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/// @brief Skip the next toSkip many elements.
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/// skipped will be increased by the amount of skipped elements afterwards
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/// Check hasMore()==true before using this
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/// NOTE: This will throw on OUT_OF_MEMORY
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int OperationCursor::skip(uint64_t toSkip, uint64_t& skipped) {
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if (!hasMore()) {
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TRI_ASSERT(false);
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// You requested more even if you should have checked it before.
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return TRI_ERROR_FORBIDDEN;
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}
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if (toSkip > _limit) {
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// Short-cut, we jump to the end
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_hasMore = false;
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return TRI_ERROR_NO_ERROR;
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}
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_indexIterator->skip(toSkip, skipped);
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if (skipped != toSkip || _limit == 0) {
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_hasMore = false;
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}
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return TRI_ERROR_NO_ERROR;
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}
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