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/*
* Copyright 2003-2021 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program 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.
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_NOT_SONG_FILTER_HXX
#define MPD_NOT_SONG_FILTER_HXX
#include "ISongFilter.hxx"
/**
* Negate an #ISongFilter.
*/
class NotSongFilter final : public ISongFilter {
ISongFilterPtr child;
friend ISongFilterPtr OptimizeSongFilter(ISongFilterPtr) noexcept;
public:
template<typename C>
explicit NotSongFilter(C &&_child) noexcept
:child(std::forward<C>(_child)) {}
/* virtual methods from ISongFilter */
ISongFilterPtr Clone() const noexcept override {
return std::make_unique<NotSongFilter>(child->Clone());
}
std::string ToExpression() const noexcept override {
return "(!" + child->ToExpression() + ")";
}
bool Match(const LightSong &song) const noexcept override {
return !child->Match(song);
}
};
#endif
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