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/**
* Copyright (C) 2013 10gen 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/>.
*/
#pragma once
#include "mongo/db/jsobj.h"
#include "mongo/bson/mutable/document.h"
#include "mongo/bson/mutable/element.h"
namespace mongo {
// Extracts the value for 'pattern' for both 'lhs' and 'rhs' and return true if 'lhs' <
// 'rhs'. We expect that both 'lhs' and 'rhs' be key patterns.
struct PatternElementCmp {
BSONObj sortPattern;
PatternElementCmp() : sortPattern(BSONObj()) {}
PatternElementCmp(const BSONObj& pattern) : sortPattern(pattern) {}
bool operator()(const mutablebson::Element& lhs, const mutablebson::Element& rhs) const {
BSONObj lhsObj = lhs.getValueObject();
BSONObj rhsObj = rhs.getValueObject();
BSONObj lhsKey = lhsObj.extractFields(sortPattern, true);
BSONObj rhsKey = rhsObj.extractFields(sortPattern, true);
return lhsKey.woCompare(rhsKey, sortPattern) < 0;
}
};
} // namespace mongo
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