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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 <map>
#include <string>
#include <utility>
#include <vector>
#include "mongo/db/update/update_leaf_node.h"
#include "mongo/stdx/memory.h"
namespace mongo {
/**
* Represents the application of a $rename to the value at the end of a path, where the path
* represents the rename destination.
*/
class RenameNode : public UpdateLeafNode {
public:
/**
* This init provides input validation on the source field (stored as the field name in
* "modExpr") and the destination field (stored as the value in "modExpr").
*/
Status init(BSONElement modExpr, const boost::intrusive_ptr<ExpressionContext>& expCtx) final;
std::unique_ptr<UpdateNode> clone() const final {
return stdx::make_unique<RenameNode>(*this);
}
void setCollator(const CollatorInterface* collator) final {}
ApplyResult apply(ApplyParams applyParams,
UpdateNodeApplyParams updateNodeApplyParams) const final;
void produceSerializationMap(
FieldRef* currentPath,
std::map<std::string, std::vector<std::pair<std::string, BSONObj>>>*
operatorOrientedUpdates) const final {
// The RenameNode sits in the update tree at the destination path, because that's the path
// that may need to be synthesized if it's not already in the document. However, the
// destination path is the _value_ and goes on the right side of the rename element (i.e.:
// {$rename: {sourcePath: "destPath"}}), unlike all other modifiers, where the path to
// synthesize is the field (on the left).
(*operatorOrientedUpdates)["$rename"].emplace_back(_val.fieldName(),
BSON("" << currentPath->dottedField()));
}
void acceptVisitor(UpdateNodeVisitor* visitor) final {
visitor->visit(this);
}
BSONElement getValue() const {
return _val;
}
private:
BSONElement _val;
};
} // namespace mongo
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