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/*
* Copyright 2003-2018 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 "song/LightSong.hxx"
#include "tag/Tag.hxx"
#include <set>
#include <string.h>
struct StringLess {
gcc_pure
bool operator()(const char *a, const char *b) const noexcept {
return strcmp(a, b) < 0;
}
};
typedef std::set<const char *, StringLess> StringSet;
static void
StatsVisitTag(DatabaseStats &stats, StringSet &artists, StringSet &albums,
const Tag &tag) noexcept
{
if (!tag.duration.IsNegative())
stats.total_duration += tag.duration;
for (const auto &item : tag) {
switch (item.type) {
case TAG_ARTIST:
artists.emplace(item.value);
break;
case TAG_ALBUM:
albums.emplace(item.value);
break;
default:
break;
}
}
}
static void
StatsVisitSong(DatabaseStats &stats, StringSet &artists, StringSet &albums,
const LightSong &song) noexcept
{
++stats.song_count;
StatsVisitTag(stats, artists, albums, song.tag);
}
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;
}
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