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/**
* Copyright (C) 2020-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/exec/mock_stage.h"
#include "mongo/util/visit_helper.h"
namespace mongo {
MockStage::MockStage(ExpressionContext* expCtx, WorkingSet* ws)
: PlanStage(kStageType.rawData(), expCtx), _ws(ws) {}
std::unique_ptr<PlanStageStats> MockStage::getStats() {
_commonStats.isEOF = isEOF();
std::unique_ptr<PlanStageStats> ret =
std::make_unique<PlanStageStats>(_commonStats, StageType::STAGE_MOCK);
ret->specific = std::make_unique<MockStats>(_specificStats);
return ret;
}
PlanStage::StageState MockStage::doWork(WorkingSetID* out) {
if (isEOF()) {
return PlanStage::IS_EOF;
}
auto nextResult = _results.front();
_results.pop();
auto returnState = stdx::visit(
visit_helper::Overloaded{
[](WorkingSetID wsid) -> PlanStage::StageState { return PlanStage::ADVANCED; },
[](PlanStage::StageState state) -> PlanStage::StageState { return state; },
[](Status status) -> PlanStage::StageState {
uassertStatusOK(status);
MONGO_UNREACHABLE;
}},
nextResult);
if (returnState == PlanStage::ADVANCED) {
*out = stdx::get<WorkingSetID>(nextResult);
}
return returnState;
}
} // namespace mongo
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