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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 <boost/optional.hpp>
#include <limits>
#include <memory>
#include <vector>
#include "mongo/base/string_data.h"
#include "mongo/db/update/modifier_node.h"
#include "mongo/db/update/push_sorter.h"
namespace mongo {
class PushNode final : public ModifierNode {
public:
Status init(BSONElement modExpr, const boost::intrusive_ptr<ExpressionContext>& expCtx) final;
std::unique_ptr<UpdateNode> clone() const final {
return std::make_unique<PushNode>(*this);
}
void setCollator(const CollatorInterface* collator) final {
if (_sort) {
invariant(!_sort->collator);
_sort->collator = collator;
}
}
void acceptVisitor(UpdateNodeVisitor* visitor) final {
visitor->visit(this);
}
protected:
ModifyResult updateExistingElement(mutablebson::Element* element,
std::shared_ptr<FieldRef> elementPath) const final;
void setValueForNewElement(mutablebson::Element* element) const final;
void logUpdate(LogBuilder* logBuilder,
StringData pathTaken,
mutablebson::Element element,
ModifyResult modifyResult) const final;
bool allowCreation() const final {
return true;
}
private:
StringData operatorName() const final {
return "$push";
}
BSONObj operatorValue() const final;
// A helper for performPush().
static ModifyResult insertElementsWithPosition(mutablebson::Element* array,
boost::optional<long long> position,
const std::vector<BSONElement>& valuesToPush);
/**
* Inserts the elements from '_valuesToPush' in the 'element' array using '_position' to
* determine where to insert. This function also applies any '_slice' and or '_sort' that is
* specified. The return value of this function will indicate to logUpdate() what kind of oplog
* entries should be generated.
*
* Returns:
* - ModifyResult::kNoOp if '_valuesToPush' is empty and no slice or sort gets performed;
* - ModifyResult::kArrayAppendUpdate if the 'elements' array is initially non-empty, all
* inserted values are appended to the end, and no slice or sort gets performed; or
* - ModifyResult::kNormalUpdate if 'elements' is initially an empty array, values get
* inserted at the beginning or in the middle of the array, or a slice or sort gets
* performed.
*/
ModifyResult performPush(mutablebson::Element* element, FieldRef* elementPath) const;
static const StringData kEachClauseName;
static const StringData kSliceClauseName;
static const StringData kSortClauseName;
static const StringData kPositionClauseName;
std::vector<BSONElement> _valuesToPush;
boost::optional<long long> _slice;
boost::optional<long long> _position;
boost::optional<PatternElementCmp> _sort;
};
} // namespace mongo
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