diff options
Diffstat (limited to 'src/db/plugins/LazyDatabase.cxx')
-rw-r--r-- | src/db/plugins/LazyDatabase.cxx | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/src/db/plugins/LazyDatabase.cxx b/src/db/plugins/LazyDatabase.cxx new file mode 100644 index 000000000..2b576b1ee --- /dev/null +++ b/src/db/plugins/LazyDatabase.cxx @@ -0,0 +1,107 @@ +/* + * 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 "LazyDatabase.hxx" +#include "db/Interface.hxx" + +#include <assert.h> + +LazyDatabase::LazyDatabase(Database *_db) + :Database(_db->GetPlugin()), db(_db), open(false) {} + +LazyDatabase::~LazyDatabase() +{ + assert(!open); + + delete db; +} + +bool +LazyDatabase::EnsureOpen(Error &error) const +{ + if (open) + return true; + + if (!db->Open(error)) + return false; + + open = true; + return true; +} + +void +LazyDatabase::Close() +{ + if (open) { + open = false; + db->Close(); + } +} + +const LightSong * +LazyDatabase::GetSong(const char *uri, Error &error) const +{ + return EnsureOpen(error) + ? db->GetSong(uri, error) + : nullptr; +} + +void +LazyDatabase::ReturnSong(const LightSong *song) const +{ + assert(open); + + db->ReturnSong(song); +} + +bool +LazyDatabase::Visit(const DatabaseSelection &selection, + VisitDirectory visit_directory, + VisitSong visit_song, + VisitPlaylist visit_playlist, + Error &error) const +{ + return EnsureOpen(error) && + db->Visit(selection, visit_directory, visit_song, + visit_playlist, error); +} + +bool +LazyDatabase::VisitUniqueTags(const DatabaseSelection &selection, + TagType tag_type, + VisitString visit_string, + Error &error) const +{ + return EnsureOpen(error) && + db->VisitUniqueTags(selection, tag_type, visit_string, error); +} + +bool +LazyDatabase::GetStats(const DatabaseSelection &selection, + DatabaseStats &stats, Error &error) const +{ + return EnsureOpen(error) && db->GetStats(selection, stats, error); +} + +time_t +LazyDatabase::GetUpdateStamp() const +{ + return open ? db->GetUpdateStamp() : 0; +} |