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/**
* Copyright (C) 2021-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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/exec/exclusion_projection_executor.h"
namespace mongo::projection_executor {
std::pair<BSONObj, bool> ExclusionNode::extractProjectOnFieldAndRename(const StringData& oldName,
const StringData& newName) {
BSONObjBuilder extractedExclusion;
// Check for a projection directly on 'oldName'. For example, {oldName: 0}.
if (auto it = _projectedFields.find(oldName); it != _projectedFields.end()) {
extractedExclusion.append(newName, false);
_projectedFields.erase(it);
}
// Check for a projection on subfields of 'oldName'. For example, {oldName: {a: 0, b: 0}}.
if (auto it = _children.find(oldName); it != _children.end()) {
extractedExclusion.append(newName, it->second->serialize(boost::none).toBson());
_children.erase(it);
}
if (auto it = std::find(_orderToProcessAdditionsAndChildren.begin(),
_orderToProcessAdditionsAndChildren.end(),
oldName);
it != _orderToProcessAdditionsAndChildren.end()) {
_orderToProcessAdditionsAndChildren.erase(it);
}
return {extractedExclusion.obj(), _projectedFields.empty() && _children.empty()};
}
} // namespace mongo::projection_executor
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