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/*
* Copyright (C) 2003-2015 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_TAG_SET_HXX
#define MPD_TAG_SET_HXX
#include "Compiler.h"
#include "Tag.hxx"
#include "Mask.hxx"
#include <set>
#include <string.h>
/**
* Helper class for #TagSet which compares two #Tag objects.
*/
struct TagLess {
gcc_pure
bool operator()(const Tag &a, const Tag &b) const {
if (a.num_items != b.num_items)
return a.num_items < b.num_items;
const unsigned n = a.num_items;
for (unsigned i = 0; i < n; ++i) {
const TagItem &ai = *a.items[i];
const TagItem &bi = *b.items[i];
if (ai.type != bi.type)
return unsigned(ai.type) < unsigned(bi.type);
const int cmp = strcmp(ai.value, bi.value);
if (cmp != 0)
return cmp < 0;
}
return false;
}
};
/**
* A set of #Tag objects.
*/
class TagSet : public std::set<Tag, TagLess> {
public:
void InsertUnique(const Tag &tag,
TagType type, tag_mask_t group_mask);
private:
void InsertUnique(const Tag &src, TagType type, const char *value,
tag_mask_t group_mask);
bool CheckUnique(TagType dest_type,
const Tag &tag, TagType src_type,
tag_mask_t group_mask);
};
#endif
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