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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_geo_near_cursor.h"
#include <boost/intrusive_ptr.hpp>
#include <boost/optional.hpp>
#include <list>
#include <memory>
#include "mongo/base/string_data.h"
#include "mongo/bson/bsonelement.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/simple_bsonobj_comparator.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/exec/document_value/document.h"
#include "mongo/db/pipeline/document_source_cursor.h"
#include "mongo/db/pipeline/document_source_sort.h"
#include "mongo/db/pipeline/expression_context.h"
#include "mongo/db/pipeline/field_path.h"
#include "mongo/db/query/plan_executor.h"
namespace mongo {
boost::intrusive_ptr<DocumentSourceGeoNearCursor> DocumentSourceGeoNearCursor::create(
Collection* collection,
std::unique_ptr<PlanExecutor, PlanExecutor::Deleter> exec,
const boost::intrusive_ptr<ExpressionContext>& expCtx,
FieldPath distanceField,
boost::optional<FieldPath> locationField,
double distanceMultiplier) {
return {new DocumentSourceGeoNearCursor(collection,
std::move(exec),
expCtx,
std::move(distanceField),
std::move(locationField),
distanceMultiplier)};
}
DocumentSourceGeoNearCursor::DocumentSourceGeoNearCursor(
Collection* collection,
std::unique_ptr<PlanExecutor, PlanExecutor::Deleter> exec,
const boost::intrusive_ptr<ExpressionContext>& expCtx,
FieldPath distanceField,
boost::optional<FieldPath> locationField,
double distanceMultiplier)
: DocumentSourceCursor(collection, std::move(exec), expCtx),
_distanceField(std::move(distanceField)),
_locationField(std::move(locationField)),
_distanceMultiplier(distanceMultiplier) {
invariant(_distanceMultiplier >= 0);
}
const char* DocumentSourceGeoNearCursor::getSourceName() const {
return DocumentSourceGeoNearCursor::kStageName.rawData();
}
Document DocumentSourceGeoNearCursor::transformDoc(Document&& objInput) const {
MutableDocument output(std::move(objInput));
// Scale the distance by the requested factor.
invariant(output.peek().metadata().hasGeoNearDistance(),
str::stream()
<< "Query returned a document that is unexpectedly missing the geoNear distance: "
<< output.peek().toString());
const auto distance = output.peek().metadata().getGeoNearDistance() * _distanceMultiplier;
output.setNestedField(_distanceField, Value(distance));
if (_locationField) {
invariant(
output.peek().metadata().hasGeoNearPoint(),
str::stream()
<< "Query returned a document that is unexpectedly missing the geoNear point: "
<< output.peek().toString());
output.setNestedField(*_locationField, output.peek().metadata().getGeoNearPoint());
}
// In a cluster, $geoNear will be merged via $sort, so add the sort key.
if (pExpCtx->needsMerge) {
const bool isSingleElementKey = true;
output.metadata().setSortKey(Value(distance), isSingleElementKey);
}
return output.freeze();
}
} // namespace mongo
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