/* * Copyright 2003-2016 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. */ #include "Helpers.hxx" #include "Stats.hxx" #include "Interface.hxx" #include "LightSong.hxx" #include "tag/Tag.hxx" #include #include struct StringLess { gcc_pure bool operator()(const char *a, const char *b) const { return strcmp(a, b) < 0; } }; typedef std::set StringSet; static void StatsVisitTag(DatabaseStats &stats, StringSet &artists, StringSet &albums, const Tag &tag) { if (!tag.duration.IsNegative()) stats.total_duration += tag.duration; for (const auto &item : tag) { switch (item.type) { case TAG_ARTIST: #if CLANG_OR_GCC_VERSION(4,8) artists.emplace(item.value); #else artists.insert(item.value); #endif break; case TAG_ALBUM: #if CLANG_OR_GCC_VERSION(4,8) albums.emplace(item.value); #else albums.insert(item.value); #endif break; default: break; } } } static bool StatsVisitSong(DatabaseStats &stats, StringSet &artists, StringSet &albums, const LightSong &song) { ++stats.song_count; StatsVisitTag(stats, artists, albums, *song.tag); return true; } DatabaseStats GetStats(const Database &db, const DatabaseSelection &selection) { DatabaseStats stats; stats.Clear(); StringSet artists, albums; using namespace std::placeholders; const auto f = std::bind(StatsVisitSong, std::ref(stats), std::ref(artists), std::ref(albums), _1); db.Visit(selection, f); stats.artist_count = artists.size(); stats.album_count = albums.size(); return stats; }