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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/matcher/expression_with_placeholder.h"
#include "mongo/db/update/update_internal_node.h"
#include "mongo/stdx/memory.h"
namespace mongo {
/**
* An internal node in the prefix tree of update modifier expressions, representing updates to an
* array using the $[<identifier>] syntax and array filters. See comment in class definition of
* UpdateNode for more details.
*/
class UpdateArrayNode : public UpdateInternalNode {
public:
/**
* Creates a new UpdateArrayNode by merging two input UpdateArrayNode objects and their
* children. Each child that lives on one side of the merge but not the other (according to the
* array filter identifier) is cloned to the newly created UpdateArrayNode. Children that exist
* on both sides of the merge get merged recursively before being added to the resulting
* UpdateArrayNode. This merge operation is a deep copy: the new UpdateArrayNode is a brand new
* tree that does not contain any references to the objects in the original input trees.
* 'leftNode' and 'rightNode' are required to have the same array filters.
*/
static std::unique_ptr<UpdateNode> createUpdateNodeByMerging(const UpdateArrayNode& leftNode,
const UpdateArrayNode& rightNode,
FieldRef* pathTaken);
UpdateArrayNode(
const std::map<StringData, std::unique_ptr<ExpressionWithPlaceholder>>& arrayFilters)
: UpdateInternalNode(Type::Array), _arrayFilters(arrayFilters) {}
std::unique_ptr<UpdateNode> clone() const final {
return stdx::make_unique<UpdateArrayNode>(*this);
}
void setCollator(const CollatorInterface* collator) final {
for (auto&& child : _children) {
child.second->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:
const std::map<StringData, std::unique_ptr<ExpressionWithPlaceholder>>& _arrayFilters;
std::map<std::string, clonable_ptr<UpdateNode>> _children;
// When calling apply() causes us to merge elements of '_children', we store the result of the
// merge in case we need it for another array element or document.
mutable stdx::unordered_map<UpdateNode*,
stdx::unordered_map<UpdateNode*, clonable_ptr<UpdateNode>>>
_mergedChildrenCache;
};
} // namespace mongo
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