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/**
* Copyright (C) 2020-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/db/pipeline/expression.h"
namespace mongo {
/**
* This expression will be used to validate that versioning code is working as expected.
* $_testApiVersion should only take one parameter, either {unstable: true} or {deprecated: true}.
* If no error is thrown, this expression will return an integer value.
*/
class ExpressionTestApiVersion final : public Expression {
public:
static constexpr auto kUnstableField = "unstable";
static constexpr auto kDeprecatedField = "deprecated";
static boost::intrusive_ptr<Expression> parse(ExpressionContext* expCtx,
BSONElement expr,
const VariablesParseState& vps);
Value evaluate(const Document& root, Variables* variables) const final;
Value serialize(SerializationOptions options) const final;
void acceptVisitor(ExpressionMutableVisitor* visitor) final {
return visitor->visit(this);
}
void acceptVisitor(ExpressionConstVisitor* visitor) const final {
return visitor->visit(this);
}
private:
ExpressionTestApiVersion(ExpressionContext* expCtx, bool unstable, bool deprecated);
bool _unstable;
bool _deprecated;
};
} // namespace mongo
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