/*
* Copyright (C) 2003-2013 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_DIRECTORY_HXX
#define MPD_DIRECTORY_HXX
#include "check.h"
#include "util/list.h"
#include "Compiler.h"
#include "DatabaseVisitor.hxx"
#include "PlaylistVector.hxx"
#include <sys/types.h>
#define DEVICE_INARCHIVE (dev_t)(-1)
#define DEVICE_CONTAINER (dev_t)(-2)
#define directory_for_each_child(pos, directory) \
list_for_each_entry(pos, &(directory).children, siblings)
#define directory_for_each_child_safe(pos, n, directory) \
list_for_each_entry_safe(pos, n, &(directory).children, siblings)
#define directory_for_each_song(pos, directory) \
list_for_each_entry(pos, &(directory).songs, siblings)
#define directory_for_each_song_safe(pos, n, directory) \
list_for_each_entry_safe(pos, n, &(directory).songs, siblings)
struct Song;
struct db_visitor;
class SongFilter;
class Error;
struct Directory {
template<class T, typename... Args> friend T *
NewVarSize(size_t declared_tail_size, size_t real_tail_size,
Args&&... args);
/**
* Pointers to the siblings of this directory within the
* parent directory. It is unused (undefined) in the root
* directory.
*
* This attribute is protected with the global #db_mutex.
* Read access in the update thread does not need protection.
*/
struct list_head siblings;
/**
* A doubly linked list of child directories.
*
* This attribute is protected with the global #db_mutex.
* Read access in the update thread does not need protection.
*/
struct list_head children;
/**
* A doubly linked list of songs within this directory.
*
* This attribute is protected with the global #db_mutex.
* Read access in the update thread does not need protection.
*/
struct list_head songs;
PlaylistVector playlists;
Directory *parent;
time_t mtime;
ino_t inode;
dev_t device;
bool have_stat; /* not needed if ino_t == dev_t == 0 is impossible */
char path[sizeof(long)];
protected:
Directory(const char *path);
gcc_malloc gcc_nonnull_all
static Directory *Allocate(const char *path);
public:
/**
* Default constructor, needed for #detached_root.
*/
Directory();
~Directory();
/**
* Generic constructor for #Directory object.
*/
gcc_malloc
static Directory *NewGeneric(const char *path_utf8, Directory *parent);
/**
* Create a new root #Directory object.
*/
gcc_malloc
static Directory *NewRoot() {
return NewGeneric("", nullptr);
}
/**
* Free this #Directory object (and the whole object tree within it),
* assuming it was already removed from the parent.
*/
void Free();
/**
* Remove this #Directory object from its parent and free it. This
* must not be called with the root Directory.
*
* Caller must lock the #db_mutex.
*/
void Delete();
/**
* Create a new #Directory object as a child of the given one.
*
* Caller must lock the #db_mutex.
*
* @param name_utf8 the UTF-8 encoded name of the new sub directory
*/
gcc_malloc
Directory *CreateChild(const char *name_utf8);
/**
* Caller must lock the #db_mutex.
*/
gcc_pure
const Directory *FindChild(const char *name) const;
gcc_pure
Directory *FindChild(const char *name) {
const Directory *cthis = this;
return const_cast<Directory *>(cthis->FindChild(name));
}
/**
* Look up a sub directory, and create the object if it does not
* exist.
*
* Caller must lock the #db_mutex.
*/
Directory *MakeChild(const char *name_utf8) {
Directory *child = FindChild(name_utf8);
if (child == nullptr)
child = CreateChild(name_utf8);
return child;
}
/**
* Looks up a directory by its relative URI.
*
* @param uri the relative URI
* @return the Directory, or nullptr if none was found
*/
gcc_pure
Directory *LookupDirectory(const char *uri);
gcc_pure
bool IsEmpty() const {
return list_empty(&children) &&
list_empty(&songs) &&
playlists.empty();
}
gcc_pure
const char *GetPath() const {
return path;
}
/**
* Returns the base name of the directory.
*/
gcc_pure
const char *GetName() const;
/**
* Is this the root directory of the music database?
*/
gcc_pure
bool IsRoot() const {
return parent == nullptr;
}
/**
* Look up a song in this directory by its name.
*
* Caller must lock the #db_mutex.
*/
gcc_pure
const Song *FindSong(const char *name_utf8) const;
gcc_pure
Song *FindSong(const char *name_utf8) {
const Directory *cthis = this;
return const_cast<Song *>(cthis->FindSong(name_utf8));
}
/**
* Looks up a song by its relative URI.
*
* Caller must lock the #db_mutex.
*
* @param uri the relative URI
* @return the song, or nullptr if none was found
*/
gcc_pure
Song *LookupSong(const char *uri);
/**
* Add a song object to this directory. Its "parent" attribute must
* be set already.
*/
void AddSong(Song *song);
/**
* Remove a song object from this directory (which effectively
* invalidates the song object, because the "parent" attribute becomes
* stale), but does not free it.
*/
void RemoveSong(Song *song);
/**
* Caller must lock the #db_mutex.
*/
void PruneEmpty();
/**
* Sort all directory entries recursively.
*
* Caller must lock the #db_mutex.
*/
void Sort();
/**
* Caller must lock #db_mutex.
*/
bool Walk(bool recursive, const SongFilter *match,
VisitDirectory visit_directory, VisitSong visit_song,
VisitPlaylist visit_playlist,
Error &error) const;
};
static inline bool
isRootDirectory(const char *name)
{
return name[0] == 0 || (name[0] == '/' && name[1] == 0);
}
#endif
