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/**
* Copyright (C) 2016 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/query/view_response_formatter.h"
#include "mongo/base/status.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/db/query/cursor_response.h"
namespace mongo {
const char ViewResponseFormatter::kCountField[] = "n";
const char ViewResponseFormatter::kDistinctField[] = "values";
const char ViewResponseFormatter::kOkField[] = "ok";
ViewResponseFormatter::ViewResponseFormatter(BSONObj aggregationResponse)
: _response(std::move(aggregationResponse)) {}
Status ViewResponseFormatter::appendAsCountResponse(BSONObjBuilder* resultBuilder) {
auto cursorResponse = CursorResponse::parseFromBSON(_response);
if (!cursorResponse.isOK())
return cursorResponse.getStatus();
auto cursorFirstBatch = cursorResponse.getValue().getBatch();
if (cursorFirstBatch.empty()) {
// There were no results from aggregation, so the count is zero.
resultBuilder->append(kCountField, 0);
} else {
invariant(cursorFirstBatch.size() == 1);
auto countObj = cursorFirstBatch.back();
resultBuilder->append(kCountField, countObj["count"].Int());
}
resultBuilder->append(kOkField, 1);
return Status::OK();
}
Status ViewResponseFormatter::appendAsDistinctResponse(BSONObjBuilder* resultBuilder) {
auto cursorResponse = CursorResponse::parseFromBSON(_response);
if (!cursorResponse.isOK())
return cursorResponse.getStatus();
auto cursorFirstBatch = cursorResponse.getValue().getBatch();
if (cursorFirstBatch.empty()) {
// It's possible for the aggregation to return no document if the query to distinct matches
// zero documents.
resultBuilder->appendArray(kDistinctField, BSONObj());
} else {
invariant(cursorFirstBatch.size() == 1);
auto distinctObj = cursorFirstBatch.back();
resultBuilder->appendArray(kDistinctField, distinctObj["distinct"].embeddedObject());
}
resultBuilder->append(kOkField, 1);
return Status::OK();
}
} // namespace mongo
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