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/*
* Copyright (C) 2003-2012 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 "DatabaseHelpers.hxx"
#include "DatabasePlugin.hxx"
#include "song.h"
#include "tag.h"
#include <functional>
#include <set>
#include <string.h>
struct StringLess {
gcc_pure
bool operator()(const char *a, const char *b) const {
return strcmp(a, b) < 0;
}
};
typedef std::set<const char *, StringLess> StringSet;
static bool
CollectTags(StringSet &set, enum tag_type tag_type, song &song)
{
struct tag *tag = song.tag;
if (tag == nullptr)
return true;
bool found = false;
for (unsigned i = 0; i < tag->num_items; ++i) {
if (tag->items[i]->type == tag_type) {
set.insert(tag->items[i]->value);
found = true;
}
}
if (!found)
set.insert("");
return true;
}
bool
VisitUniqueTags(const Database &db, const DatabaseSelection &selection,
enum tag_type tag_type,
VisitString visit_string,
GError **error_r)
{
StringSet set;
using namespace std::placeholders;
const auto f = std::bind(CollectTags, std::ref(set), tag_type, _1);
if (!db.Visit(selection, f, error_r))
return false;
for (auto value : set)
if (!visit_string(value, error_r))
return false;
return true;
}
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