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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/jsobj.h"
#include "mongo/db/pipeline/document_source.h"
#include "mongo/db/pipeline/expression_context.h"
namespace mongo {
using boost::intrusive_ptr;
using std::vector;
using std::string;
REGISTER_DOCUMENT_SOURCE_ALIAS(count, DocumentSourceCount::createFromBson);
vector<intrusive_ptr<DocumentSource>> DocumentSourceCount::createFromBson(
BSONElement elem, const intrusive_ptr<ExpressionContext>& pExpCtx) {
uassert(40156,
str::stream() << "the count field must be a non-empty string",
elem.type() == String);
StringData elemString = elem.valueStringData();
uassert(
40157, str::stream() << "the count field must be a non-empty string", !elemString.empty());
uassert(40158,
str::stream() << "the count field cannot be a $-prefixed path",
elemString[0] != '$');
uassert(40159,
str::stream() << "the count field cannot contain a null byte",
elemString.find('\0') == string::npos);
uassert(40160,
str::stream() << "the count field cannot contain '.'",
elemString.find('.') == string::npos);
BSONObj groupObj = BSON("$group" << BSON("_id" << BSONNULL << elemString << BSON("$sum" << 1)));
BSONObj projectObj = BSON("$project" << BSON("_id" << 0 << elemString << 1));
auto groupSource = DocumentSourceGroup::createFromBson(groupObj.firstElement(), pExpCtx);
auto projectSource = DocumentSourceProject::create(projectObj.firstElement(), pExpCtx);
return {groupSource, projectSource};
}
} // namespace mongo
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