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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 <utility>
#include "mongo/bson/unordered_fields_bsonelement_comparator.h"
#include "mongo/db/matcher/expression_array.h"
namespace mongo {
/**
* Matches arrays whose elements are all unique. When comparing elements,
*
* - strings are always compared using the "simple" string comparator; and
* - objects are compared in a field order-independent manner.
*/
class InternalSchemaUniqueItemsMatchExpression final : public ArrayMatchingMatchExpression {
public:
static constexpr StringData kName = "$_internalSchemaUniqueItems"_sd;
explicit InternalSchemaUniqueItemsMatchExpression(StringData path)
: ArrayMatchingMatchExpression(MatchExpression::INTERNAL_SCHEMA_UNIQUE_ITEMS, path) {}
size_t numChildren() const final {
return 0;
}
MatchExpression* getChild(size_t i) const final {
MONGO_UNREACHABLE;
}
std::vector<MatchExpression*>* getChildVector() final {
return nullptr;
}
bool matchesArray(const BSONObj& array, MatchDetails*) const final {
auto set = _comparator.makeBSONEltSet();
for (auto&& elem : array) {
if (!std::get<bool>(set.insert(elem))) {
return false;
}
}
return true;
}
void debugString(StringBuilder& builder, int level) const final;
bool equivalent(const MatchExpression* other) const final;
void serialize(BSONObjBuilder* builder) const final;
std::unique_ptr<MatchExpression> shallowClone() const final;
private:
ExpressionOptimizerFunc getOptimizer() const final {
return [](std::unique_ptr<MatchExpression> expression) { return expression; };
}
// The comparator to use when comparing BSONElements, which will never use a collation.
UnorderedFieldsBSONElementComparator _comparator;
};
} // namespace mongo
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