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db/Interface: CollectUniqueTags() allows multiple "groups"

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Instead of passing tag and group, pass an array of tags.  To support a
nested return value, return a nested std::map of std::maps.  Each key
specifies the tag value, and each value may be another nesting level.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/408
This commit is contained in:
Max Kellermann
2018-11-19 11:17:25 +01:00
committed by Max Kellermann
parent 923c1b6220
commit 1eae9339f2
12 changed files with 166 additions and 123 deletions
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16
src/db/Interface.hxx
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@@ -1,5 +1,5 @@
/*
* Copyright 2003-2018 The Music Player Daemon Project
* Copyright 2003-2019 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
@@ -25,15 +25,14 @@
#include "util/Compiler.h"
#include <chrono>
#include <map>
#include <set>
#include <string>
struct DatabasePlugin;
struct DatabaseStats;
struct DatabaseSelection;
struct LightSong;
class TagMask;
template<typename Key> class RecursiveMap;
template<typename T> struct ConstBuffer;
class Database {
const DatabasePlugin &plugin;
@@ -106,13 +105,14 @@ public:
}
/**
* Collect unique values of the given tag type.
* Collect unique values of the given tag types. Each item in
* the #tag_types parameter results in one nesting level in
* the return value.
*
* Throws on error.
*/
virtual std::map<std::string, std::set<std::string>> CollectUniqueTags(const DatabaseSelection &selection,
TagType tag_type,
TagType group=TAG_NUM_OF_ITEM_TYPES) const = 0;
virtual RecursiveMap<std::string> CollectUniqueTags(const DatabaseSelection &selection,
ConstBuffer<TagType> tag_types) const = 0;
/**
* Throws on error.