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/*
* Copyright (C) 2018 Codership Oy <info@codership.com>
*
* This file is part of wsrep-lib.
*
* Wsrep-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* Wsrep-lib 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
*/
/** @file id.hpp
*
* A generic identifier utility class.
*/
#ifndef WSREP_ID_HPP
#define WSREP_ID_HPP
#include "exception.hpp"
#include <iosfwd>
#include <cstring> // std::memset()
namespace wsrep
{
/**
* The idientifier class stores identifiers either in UUID
* format or in string format. The storage format is decided
* upon construction. If the given string contains a valid
* UUID, the storage format will be binary. Otherwise the
* string will be copied verbatim. If the string format is used,
* the maximum length of the identifier is limited to 16 bytes.
*/
class id
{
public:
typedef struct native_type { unsigned char buf[16]; } native_type;
/**
* Default constructor. Constructs an empty identifier.
*/
id() : data_() { std::memset(data_.buf, 0, sizeof(data_.buf)); }
/**
* Construct from string. The input string may contain either
* valid UUID or a string with maximum 16 bytes length.
*/
id(const std::string&);
/**
* Construct from void pointer.
*/
id (const void* data, size_t size) : data_()
{
if (size > 16)
{
throw wsrep::runtime_error("Too long identifier");
}
std::memset(data_.buf, 0, sizeof(data_.buf));
std::memcpy(data_.buf, data, size);
}
bool operator<(const id& other) const
{
return (std::memcmp(data_.buf, other.data_.buf, sizeof(data_.buf)) < 0);
}
bool operator==(const id& other) const
{
return (std::memcmp(data_.buf, other.data_.buf, sizeof(data_.buf)) == 0);
}
bool operator!=(const id& other) const
{
return !(*this == other);
}
const void* data() const { return data_.buf; }
size_t size() const { return sizeof(data_); }
bool is_undefined() const
{
return (*this == undefined());
}
static const wsrep::id& undefined()
{
return undefined_;
}
private:
static const wsrep::id undefined_;
native_type data_;
};
std::ostream& operator<<(std::ostream&, const wsrep::id& id);
std::istream& operator>>(std::istream&, wsrep::id& id);
}
#endif // WSREP_ID_HPP
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