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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 <vector>
#include "mongo/db/matcher/expression.h"
#include "mongo/db/matcher/expression_tree.h"
#include "mongo/db/pipeline/expression.h"
#include "mongo/db/pipeline/expression_context.h"
namespace mongo {
/**
* MatchExpression for the top-level $expr keyword. Take an expression as an argument, evaluates and
* coerces to boolean form which determines whether a document is a match.
*/
class ExprMatchExpression final : public MatchExpression {
public:
ExprMatchExpression(BSONElement elem, const boost::intrusive_ptr<ExpressionContext>& expCtx);
ExprMatchExpression(boost::intrusive_ptr<Expression> expr,
const boost::intrusive_ptr<ExpressionContext>& expCtx)
: MatchExpression(MatchType::EXPRESSION), _expCtx(expCtx), _expression(expr) {}
bool matchesSingleElement(const BSONElement& e, MatchDetails* details = nullptr) const final {
MONGO_UNREACHABLE;
}
bool matches(const MatchableDocument* doc, MatchDetails* details = nullptr) const final;
std::unique_ptr<MatchExpression> shallowClone() const final;
void debugString(StringBuilder& debug, int level = 0) const final {
_debugAddSpace(debug, level);
debug << "$expr " << _expression->serialize(false).toString();
}
void serialize(BSONObjBuilder* out) const final;
bool equivalent(const MatchExpression* other) const final;
MatchCategory getCategory() const final {
return MatchCategory::kOther;
}
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;
void _doAddDependencies(DepsTracker* deps) const final {
if (_expression) {
_expression->addDependencies(deps);
}
}
boost::intrusive_ptr<ExpressionContext> _expCtx;
boost::intrusive_ptr<Expression> _expression;
};
} // namespace mongo
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