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/**
* Copyright (C) 2018-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/pipeline/document_source_project.h"
#include <boost/optional.hpp>
#include <boost/smart_ptr/intrusive_ptr.hpp>
#include "mongo/db/pipeline/lite_parsed_document_source.h"
#include "mongo/db/pipeline/parsed_aggregation_projection.h"
namespace mongo {
using boost::intrusive_ptr;
using parsed_aggregation_projection::ParsedAggregationProjection;
using ProjectionArrayRecursionPolicy = ParsedAggregationProjection::ProjectionArrayRecursionPolicy;
using ProjectionDefaultIdPolicy = ParsedAggregationProjection::ProjectionDefaultIdPolicy;
REGISTER_DOCUMENT_SOURCE(project,
LiteParsedDocumentSourceDefault::parse,
DocumentSourceProject::createFromBson);
intrusive_ptr<DocumentSource> DocumentSourceProject::create(
BSONObj projectSpec, const intrusive_ptr<ExpressionContext>& expCtx) {
const bool isIndependentOfAnyCollection = false;
intrusive_ptr<DocumentSource> project(new DocumentSourceSingleDocumentTransformation(
expCtx,
ParsedAggregationProjection::create(expCtx,
projectSpec,
ProjectionDefaultIdPolicy::kIncludeId,
ProjectionArrayRecursionPolicy::kRecurseNestedArrays),
"$project",
isIndependentOfAnyCollection));
return project;
}
intrusive_ptr<DocumentSource> DocumentSourceProject::createFromBson(
BSONElement elem, const intrusive_ptr<ExpressionContext>& expCtx) {
uassert(15969, "$project specification must be an object", elem.type() == Object);
return DocumentSourceProject::create(elem.Obj(), expCtx);
}
} // namespace mongo
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