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/**
* Copyright (C) 2018 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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/projection_exec_agg.h"
#include "mongo/db/pipeline/document.h"
#include "mongo/db/pipeline/expression_context.h"
#include "mongo/db/pipeline/parsed_aggregation_projection.h"
namespace mongo {
class ProjectionExecAgg::ProjectionExecutor {
public:
using ParsedAggregationProjection = parsed_aggregation_projection::ParsedAggregationProjection;
using ProjectionParseMode = ParsedAggregationProjection::ProjectionParseMode;
using TransformerType = TransformerInterface::TransformerType;
ProjectionExecutor(BSONObj projSpec) {
// Construct a dummy ExpressionContext for ParsedAggregationProjection. It's OK to set the
// ExpressionContext's OperationContext and CollatorInterface to 'nullptr' here; since we
// ban computed fields from the projection, the ExpressionContext will never be used.
boost::intrusive_ptr<ExpressionContext> expCtx(new ExpressionContext(nullptr, nullptr));
_projection = ParsedAggregationProjection::create(
expCtx, projSpec, ProjectionParseMode::kBanComputedFields);
}
ProjectionType getType() const {
return (_projection->getType() == TransformerType::kInclusionProjection
? ProjectionType::kInclusionProjection
: ProjectionType::kExclusionProjection);
}
BSONObj applyProjection(BSONObj inputDoc) const {
return _projection->applyTransformation(Document{inputDoc}).toBson();
}
private:
std::unique_ptr<ParsedAggregationProjection> _projection;
};
// ProjectionExecAgg's constructor and destructor are defined here, at a point where the
// implementation of ProjectionExecutor is known, so that std::unique_ptr can be used with the
// forward-declared ProjectionExecutor class.
ProjectionExecAgg::ProjectionExecAgg(BSONObj projSpec, std::unique_ptr<ProjectionExecutor> exec)
: _exec(std::move(exec)), _projSpec(std::move(projSpec)){};
ProjectionExecAgg::~ProjectionExecAgg() = default;
std::unique_ptr<ProjectionExecAgg> ProjectionExecAgg::create(BSONObj projSpec) {
return std::unique_ptr<ProjectionExecAgg>(
new ProjectionExecAgg(projSpec, std::make_unique<ProjectionExecutor>(projSpec)));
}
ProjectionExecAgg::ProjectionType ProjectionExecAgg::getType() const {
return _exec->getType();
}
BSONObj ProjectionExecAgg::applyProjection(BSONObj inputDoc) const {
return _exec->applyProjection(inputDoc);
}
} // namespace mongo
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