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/**
* Copyright (C) 2022-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 <ostream>
#include "mongo/db/field_ref.h"
namespace mongo::sbe {
/**
* The sbe::MatchPath class is used by SBE to represent field paths for MatchExpressions. This class
* derives from FieldRef and overrides several methods to provide more uniform behavior in the case
* where the full path is empty ("").
*/
class MatchPath : public FieldRef {
public:
MatchPath() = default;
MatchPath(const MatchPath&) = default;
MatchPath(MatchPath&&) = default;
MatchPath(const FieldRef& other) : FieldRef(other) {}
MatchPath(FieldRef&& other) : FieldRef(std::move(other)) {}
explicit MatchPath(StringData path) : FieldRef(path) {}
~MatchPath() {}
MatchPath& operator=(const FieldRef& other) {
*static_cast<FieldRef*>(this) = other;
return *this;
}
MatchPath& operator=(FieldRef&& other) {
*static_cast<FieldRef*>(this) = std::move(other);
return *this;
}
FieldIndex numParts() const {
auto n = FieldRef::numParts();
return n ? n : 1;
}
StringData getPart(FieldIndex i) const {
return FieldRef::numParts() == 0 && i == 0 ? ""_sd : FieldRef::getPart(i);
}
StringData operator[](int index) const {
return getPart(index);
}
bool equalsDottedField(StringData other) const {
return FieldRef::numParts() == 0 ? other == ""_sd : FieldRef::equalsDottedField(other);
}
StringData dottedField(FieldIndex offsetFromStart = 0) const {
if (FieldRef::numParts() == 0) {
return (offsetFromStart == 0) ? ""_sd : StringData();
}
return FieldRef::dottedField(offsetFromStart);
}
StringData dottedSubstring(FieldIndex startPart, FieldIndex endPart) const {
if (!FieldRef::numParts()) {
return (startPart == 0 && endPart == 1) ? ""_sd : StringData();
}
return FieldRef::dottedSubstring(startPart, endPart);
}
bool isPathComponentEmpty(FieldIndex i) const {
return getPart(i) == ""_sd;
}
bool hasEmptyPathComponents() const {
for (FieldIndex i = 0; i < numParts(); ++i) {
if (isPathComponentEmpty(i)) {
return true;
}
}
return false;
}
};
inline std::ostream& operator<<(std::ostream& stream, const MatchPath& field) {
return stream << field.dottedField();
}
} // namespace mongo::sbe
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