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// update_index_data.h
/**
* 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 <set>
#include "mongo/base/string_data.h"
#include "mongo/db/field_ref.h"
namespace mongo {
/**
* Holds pre-processed index spec information to allow update to quickly determine if an update
* can be applied as a delta to a document, or if the document must be re-indexed.
*/
class UpdateIndexData {
public:
UpdateIndexData();
/**
* Returns the canonicalized index form for 'path', removing numerical path components as well
* as '$' path components.
*/
static FieldRef getCanonicalIndexField(const FieldRef& path);
/**
* Register a path. Any update targeting this path (or a parent of this path) will
* trigger a recomputation of the document's index keys.
*/
void addPath(const FieldRef& path);
/**
* Register a path component. Any update targeting a path that contains this exact
* component will trigger a recomputation of the document's index keys.
*/
void addPathComponent(StringData pathComponent);
/**
* Register the "wildcard" path. All updates will trigger a recomputation of the document's
* index keys.
*/
void allPathsIndexed();
void clear();
bool mightBeIndexed(const FieldRef& path) const;
private:
/**
* Returns true if 'b' is a prefix of 'a', or if the two paths are equal.
*/
bool _startsWith(const FieldRef& a, const FieldRef& b) const;
std::set<FieldRef> _canonicalPaths;
std::set<std::string> _pathComponents;
bool _allPathsIndexed;
};
}
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