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/**
* Copyright (C) 2017 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.
*/
#pragma once
#include "mongo/bson/unordered_fields_bsonelement_comparator.h"
#include "mongo/db/matcher/expression_leaf.h"
namespace mongo {
/**
* MatchExpression for $_internalSchemaEq, which behaves similar to $eq except:
*
* - leaf arrays are not traversed.
* - comparisons between objects do not consider field order.
* - null element values only match the literal null, and not missing or undefined values.
* - always uses simple string comparison semantics, even if the query has a non-simple collation.
*/
class InternalSchemaEqMatchExpression final : public LeafMatchExpression {
public:
static constexpr StringData kName = "$_internalSchemaEq"_sd;
InternalSchemaEqMatchExpression(StringData path, BSONElement rhs);
std::unique_ptr<MatchExpression> shallowClone() const final;
bool matchesSingleElement(const BSONElement&, MatchDetails*) const final;
void debugString(StringBuilder& debug, int level) const final;
void serialize(BSONObjBuilder* out) const final;
bool equivalent(const MatchExpression* other) const final;
size_t numChildren() const final {
return 0;
}
MatchExpression* getChild(size_t i) const final {
MONGO_UNREACHABLE;
}
std::vector<MatchExpression*>* getChildVector() final {
return nullptr;
}
private:
ExpressionOptimizerFunc getOptimizer() const final {
return [](std::unique_ptr<MatchExpression> expression) { return expression; };
}
UnorderedFieldsBSONElementComparator _eltCmp;
BSONElement _rhsElem;
};
} // namespace mongo
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