db_plugin: introducing a plugin API for the song database

First draft, not really pluggable currently - hard-coded to use the
"simple" plugin, and calls several of its internal functions.

The API is very simple currently, all searches are still performed
over the root "directory" object.  Future changes to the API will move
those search implementations into the plugin, to allow more efficient
implementations, or implementations that don't have the whole tree in
memory all the time.

1 files changed, 42 insertions, 0 deletions

diff --git a/src/db/simple_db_plugin.h b/src/db/simple_db_plugin.h
new file mode 100644
index 000000000..511505846
--- /dev/null
+++ b/src/db/simple_db_plugin.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2003-2011 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_SIMPLE_DB_PLUGIN_H
+#define MPD_SIMPLE_DB_PLUGIN_H
+
+#include <glib.h>
+#include <stdbool.h>
+#include <time.h>
+
+extern const struct db_plugin simple_db_plugin;
+
+struct db;
+
+G_GNUC_PURE
+struct directory *
+simple_db_get_root(struct db *db);
+
+bool
+simple_db_save(struct db *db, GError **error_r);
+
+G_GNUC_PURE
+time_t
+simple_db_get_mtime(const struct db *db);
+
+#endif