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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 "mongo/base/clonable_ptr.h"
#include "mongo/bson/bsonelement.h"
#include "mongo/db/matcher/expression_with_placeholder.h"
#include "mongo/db/update/modifier_table.h"
#include "mongo/db/update/update_internal_node.h"
#include "mongo/stdx/memory.h"
#include "mongo/stdx/unordered_map.h"
namespace mongo {
/**
* An internal node in the prefix tree of update modifier expressions, representing updates to an
* object. See comment in class definition of UpdateNode for more details.
*/
class UpdateObjectNode : public UpdateInternalNode {
public:
/**
* Parses 'modExpr' as an update modifier expression and merges with it with 'root'. Returns a
* non-OK status if 'modExpr' is not a valid update modifier expression, if merging would
* cause a conflict, or if there is an array filter identifier in 'modExpr' without a
* corresponding filter in 'arrayFilters'. Returns true if the path of 'modExpr' contains a
* positional $ element, e.g. 'a.$.b'. Any array filter identifiers are added to
* 'foundIdentifiers'.
*/
static StatusWith<bool> parseAndMerge(
UpdateObjectNode* root,
modifiertable::ModifierType type,
BSONElement modExpr,
const boost::intrusive_ptr<ExpressionContext>& expCtx,
const std::map<StringData, std::unique_ptr<ExpressionWithPlaceholder>>& arrayFilters,
std::set<std::string>& foundIdentifiers);
/**
* Creates a new UpdateObjectNode by merging two input UpdateObjectNode objects and their
* children. Each field that lives on one side of the merge but not the other (according to
* field name) is cloned to the newly created UpdateObjectNode. Fields that exist on both sides
* of the merge get merged recursively before being added to the resulting UpdateObjectNode.
* This merge operation is a deep copy: the new UpdateObjectNode is a brand new tree that does
* not contain any references to the objects in the original input trees.
*/
static std::unique_ptr<UpdateNode> createUpdateNodeByMerging(const UpdateObjectNode& leftNode,
const UpdateObjectNode& rightNode,
FieldRef* pathTaken);
UpdateObjectNode() : UpdateInternalNode(Type::Object) {}
std::unique_ptr<UpdateNode> clone() const final {
return stdx::make_unique<UpdateObjectNode>(*this);
}
void setCollator(const CollatorInterface* collator) final {
for (auto&& child : _children) {
child.second->setCollator(collator);
}
if (_positionalChild) {
_positionalChild->setCollator(collator);
}
}
ApplyResult apply(ApplyParams applyParams) const final;
UpdateNode* getChild(const std::string& field) const final;
void setChild(std::string field, std::unique_ptr<UpdateNode> child) final;
private:
std::map<std::string, clonable_ptr<UpdateNode>> _children;
clonable_ptr<UpdateNode> _positionalChild;
// When calling apply() causes us to merge an element of '_children' with '_positionalChild', we
// store the result of the merge in case we need it in a future call to apply().
mutable stdx::unordered_map<std::string, clonable_ptr<UpdateNode>> _mergedChildrenCache;
};
} // namespace mongo
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