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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 <map>
#include <string>
#include "mongo/base/clonable_ptr.h"
#include "mongo/db/field_ref.h"
#include "mongo/db/update/update_node.h"
namespace mongo {
/**
* An internal node in the prefix tree of update modifier expressions. See comment in class
* definition of UpdateNode for more details.
*/
class UpdateInternalNode : public UpdateNode {
public:
/**
* Helper class for appending to a FieldRef for the duration of the current scope and then
* restoring the FieldRef at the end of the scope.
*/
class FieldRefTempAppend {
public:
FieldRefTempAppend(FieldRef& fieldRef, StringData part) : _fieldRef(fieldRef) {
_fieldRef.appendPart(part);
}
~FieldRefTempAppend() {
_fieldRef.removeLastPart();
}
private:
FieldRef& _fieldRef;
};
UpdateInternalNode(UpdateNode::Type type) : UpdateNode(type) {}
/**
* Returns the child with field name 'field' or nullptr if there is no such child.
*/
virtual UpdateNode* getChild(const std::string& field) const = 0;
/**
* Adds a child with field name 'field'. The node must not already have a child with field
* name 'field'.
*/
virtual void setChild(std::string field, std::unique_ptr<UpdateNode> child) = 0;
protected:
/**
* Helper for subclass implementations of createUpdateNodeByMerging. Any UpdateNode value whose
* key is only in 'leftMap' or only in 'rightMap' is cloned and added to the output map. If the
* key is in both maps, the two UpdateNodes are merged and added to the output map. If
* wrapFieldNameAsArrayFilterIdentifier is true, field names are wrapped as $[<field name>] for
* error reporting.
*/
static std::map<std::string, clonable_ptr<UpdateNode>> createUpdateNodeMapByMerging(
const std::map<std::string, clonable_ptr<UpdateNode>>& leftMap,
const std::map<std::string, clonable_ptr<UpdateNode>>& rightMap,
FieldRef* pathTaken,
bool wrapFieldNameAsArrayFilterIdentifier = false);
/**
* Helper for subclass implementations of createUpdateNodeByMerging. If one of 'leftNode' or
* 'rightNode' is non-null, we clone it. If 'leftNode' and 'rightNode' are both non-null, we
* merge them recursively. If 'leftNode' and 'rightNode' are both null, we return nullptr. If
* wrapFieldNameAsArrayFilterIdentifier is true, field names are wrapped as $[<field name>] for
* error reporting.
*/
static std::unique_ptr<UpdateNode> copyOrMergeAsNecessary(
UpdateNode* leftNode,
UpdateNode* rightNode,
FieldRef* pathTaken,
const std::string& nextField,
bool wrapFieldNameAsArrayFilterIdentifier = false);
};
} // namespace mongo
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