db/simple: create dedicated directory

src/db/plugins/simple/Directory.cxx

@@ -0,0 +1,291 @@
+/*
+ * Copyright (C) 2003-2014 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 "config.h"
+#include "Directory.hxx"
+#include "SongSort.hxx"
+#include "Song.hxx"
+#include "db/LightDirectory.hxx"
+#include "db/LightSong.hxx"
+#include "db/Uri.hxx"
+#include "db/DatabaseLock.hxx"
+#include "SongFilter.hxx"
+#include "lib/icu/Collate.hxx"
+#include "fs/Traits.hxx"
+#include "util/Alloc.hxx"
+#include "util/Error.hxx"
+
+extern "C" {
+#include "util/list_sort.h"
+}
+
+#include <assert.h>
+#include <string.h>
+#include <stdlib.h>
+
+Directory::Directory(std::string &&_path_utf8, Directory *_parent)
+	:parent(_parent),
+	 mtime(0), have_stat(false),
+	 path(std::move(_path_utf8))
+{
+	INIT_LIST_HEAD(&children);
+	INIT_LIST_HEAD(&songs);
+}
+
+Directory::~Directory()
+{
+	Song *song, *ns;
+	directory_for_each_song_safe(song, ns, *this)
+		song->Free();
+
+	Directory *child, *n;
+	directory_for_each_child_safe(child, n, *this)
+		delete child;
+}
+
+void
+Directory::Delete()
+{
+	assert(holding_db_lock());
+	assert(parent != nullptr);
+
+	list_del(&siblings);
+	delete this;
+}
+
+const char *
+Directory::GetName() const
+{
+	assert(!IsRoot());
+
+	return PathTraitsUTF8::GetBase(path.c_str());
+}
+
+Directory *
+Directory::CreateChild(const char *name_utf8)
+{
+	assert(holding_db_lock());
+	assert(name_utf8 != nullptr);
+	assert(*name_utf8 != 0);
+
+	std::string path_utf8 = IsRoot()
+		? std::string(name_utf8)
+		: PathTraitsUTF8::Build(GetPath(), name_utf8);
+
+	Directory *child = new Directory(std::move(path_utf8), this);
+	list_add_tail(&child->siblings, &children);
+	return child;
+}
+
+const Directory *
+Directory::FindChild(const char *name) const
+{
+	assert(holding_db_lock());
+
+	const Directory *child;
+	directory_for_each_child(child, *this)
+		if (strcmp(child->GetName(), name) == 0)
+			return child;
+
+	return nullptr;
+}
+
+void
+Directory::PruneEmpty()
+{
+	assert(holding_db_lock());
+
+	Directory *child, *n;
+	directory_for_each_child_safe(child, n, *this) {
+		child->PruneEmpty();
+
+		if (child->IsEmpty())
+			child->Delete();
+	}
+}
+
+Directory *
+Directory::LookupDirectory(const char *uri)
+{
+	assert(holding_db_lock());
+	assert(uri != nullptr);
+
+	if (isRootDirectory(uri))
+		return this;
+
+	char *duplicated = xstrdup(uri), *name = duplicated;
+
+	Directory *d = this;
+	while (1) {
+		char *slash = strchr(name, '/');
+		if (slash == name) {
+			d = nullptr;
+			break;
+		}
+
+		if (slash != nullptr)
+			*slash = '\0';
+
+		d = d->FindChild(name);
+		if (d == nullptr || slash == nullptr)
+			break;
+
+		name = slash + 1;
+	}
+
+	free(duplicated);
+
+	return d;
+}
+
+void
+Directory::AddSong(Song *song)
+{
+	assert(holding_db_lock());
+	assert(song != nullptr);
+	assert(song->parent == this);
+
+	list_add_tail(&song->siblings, &songs);
+}
+
+void
+Directory::RemoveSong(Song *song)
+{
+	assert(holding_db_lock());
+	assert(song != nullptr);
+	assert(song->parent == this);
+
+	list_del(&song->siblings);
+}
+
+const Song *
+Directory::FindSong(const char *name_utf8) const
+{
+	assert(holding_db_lock());
+	assert(name_utf8 != nullptr);
+
+	Song *song;
+	directory_for_each_song(song, *this) {
+		assert(song->parent == this);
+
+		if (strcmp(song->uri, name_utf8) == 0)
+			return song;
+	}
+
+	return nullptr;
+}
+
+Song *
+Directory::LookupSong(const char *uri)
+{
+	char *duplicated, *base;
+
+	assert(holding_db_lock());
+	assert(uri != nullptr);
+
+	duplicated = xstrdup(uri);
+	base = strrchr(duplicated, '/');
+
+	Directory *d = this;
+	if (base != nullptr) {
+		*base++ = 0;
+		d = d->LookupDirectory(duplicated);
+		if (d == nullptr) {
+			free(duplicated);
+			return nullptr;
+		}
+	} else
+		base = duplicated;
+
+	Song *song = d->FindSong(base);
+	assert(song == nullptr || song->parent == d);
+
+	free(duplicated);
+	return song;
+
+}
+
+static int
+directory_cmp(gcc_unused void *priv,
+	      struct list_head *_a, struct list_head *_b)
+{
+	const Directory *a = (const Directory *)_a;
+	const Directory *b = (const Directory *)_b;
+
+	return IcuCollate(a->path.c_str(), b->path.c_str());
+}
+
+void
+Directory::Sort()
+{
+	assert(holding_db_lock());
+
+	list_sort(nullptr, &children, directory_cmp);
+	song_list_sort(&songs);
+
+	Directory *child;
+	directory_for_each_child(child, *this)
+		child->Sort();
+}
+
+bool
+Directory::Walk(bool recursive, const SongFilter *filter,
+		VisitDirectory visit_directory, VisitSong visit_song,
+		VisitPlaylist visit_playlist,
+		Error &error) const
+{
+	assert(!error.IsDefined());
+
+	if (visit_song) {
+		Song *song;
+		directory_for_each_song(song, *this) {
+			const LightSong song2 = song->Export();
+			if ((filter == nullptr || filter->Match(song2)) &&
+			    !visit_song(song2, error))
+				return false;
+		}
+	}
+
+	if (visit_playlist) {
+		for (const PlaylistInfo &p : playlists)
+			if (!visit_playlist(p, Export(), error))
+				return false;
+	}
+
+	Directory *child;
+	directory_for_each_child(child, *this) {
+		if (visit_directory &&
+		    !visit_directory(child->Export(), error))
+			return false;
+
+		if (recursive &&
+		    !child->Walk(recursive, filter,
+				 visit_directory, visit_song, visit_playlist,
+				 error))
+			return false;
+	}
+
+	return true;
+}
+
+LightDirectory
+Directory::Export() const
+{
+	return LightDirectory(GetPath(), mtime);
+}