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/*
* Copyright © 2020 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored by: Christopher James Halse Rogers <christopher.halse.rogers@canonical.com>
*/
#ifndef WLCS_VERSION_SPECIFIER_H_
#define WLCS_VERSION_SPECIFIER_H_
#include <cstdint>
#include <optional>
#include <string>
namespace wlcs
{
class VersionSpecifier
{
public:
VersionSpecifier() = default;
virtual ~VersionSpecifier() = default;
virtual auto select_version(
uint32_t max_available_version,
uint32_t max_supported_version) const -> std::optional<uint32_t> = 0;
virtual auto describe() const -> std::string = 0;
};
class ExactlyVersion : public VersionSpecifier
{
public:
explicit ExactlyVersion(uint32_t version) noexcept;
auto select_version(
uint32_t max_available_version,
uint32_t max_supported_version) const -> std::optional<uint32_t> override;
auto describe() const -> std::string override;
private:
uint32_t const version;
};
class AtLeastVersion : public VersionSpecifier
{
public:
explicit AtLeastVersion(uint32_t version) noexcept;
auto select_version(
uint32_t max_available_version,
uint32_t max_supported_version) const -> std::optional<uint32_t> override;
auto describe() const -> std::string override;
private:
uint32_t const version;
};
extern VersionSpecifier const& AnyVersion;
}
#endif //WLCS_VERSION_SPECIFIER_H_
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