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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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/base/string_data.h"
#include "mongo/db/matcher/expression.h"
#include "mongo/db/matcher/expression_array.h"
#include "mongo/db/matcher/expression_with_placeholder.h"
namespace mongo {
/**
* A match expression similar to $elemMatch, but only matches arrays for which every element
* matches the sub-expression.
*/
class InternalSchemaAllElemMatchFromIndexMatchExpression final
: public ArrayMatchingMatchExpression {
public:
static constexpr StringData kName = "$_internalSchemaAllElemMatchFromIndex"_sd;
InternalSchemaAllElemMatchFromIndexMatchExpression(
StringData path, long long index, std::unique_ptr<ExpressionWithPlaceholder> expression);
std::unique_ptr<MatchExpression> shallowClone() const final;
bool matchesArray(const BSONObj& array, MatchDetails* details) const final {
auto iter = BSONObjIterator(array);
for (int i = 0; iter.more() && i < _index; i++) {
iter.next();
}
while (iter.more()) {
if (!_expression->matchesBSONElement(iter.next(), details)) {
return false;
}
}
return true;
}
void debugString(StringBuilder& debug, int level) const final;
void serialize(BSONObjBuilder* out) const final;
bool equivalent(const MatchExpression* other) const final;
std::vector<MatchExpression*>* getChildVector() final {
return nullptr;
}
size_t numChildren() const final {
return 1;
}
MatchExpression* getChild(size_t i) const final {
invariant(i == 0);
return _expression->getFilter();
}
private:
ExpressionOptimizerFunc getOptimizer() const final;
long long _index;
std::unique_ptr<ExpressionWithPlaceholder> _expression;
};
} // namespace mongo
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