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+/*
+ * 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.
+ */
+
+/** \file
+ *
+ * This header declares the db_plugin class. It describes a
+ * plugin API for databases of song metadata.
+ */
+
+#ifndef MPD_DATABASE_PLUGIN_HXX
+#define MPD_DATABASE_PLUGIN_HXX
+
+#include "DatabaseVisitor.hxx"
+
+#include <glib.h>
+#include <assert.h>
+#include <stdbool.h>
+
+struct config_param;
+struct db_selection;
+struct db_visitor;
+
+class Database {
+public:
+ /**
+ * Free instance data.
+ */
+ virtual ~Database() {}
+
+ /**
+ * Open the database. Read it into memory if applicable.
+ */
+ virtual bool Open(G_GNUC_UNUSED GError **error_r) {
+ return true;
+ }
+
+ /**
+ * Close the database, free allocated memory.
+ */
+ virtual void Close() {}
+
+ /**
+ * Look up a song (including tag data) in the database.
+ *
+ * @param uri_utf8 the URI of the song within the music
+ * directory (UTF-8)
+ */
+ virtual struct song *GetSong(const char *uri_utf8,
+ GError **error_r) = 0;
+
+ /**
+ * Visit the selected entities.
+ */
+ virtual bool Visit(const struct db_selection *selection,
+ VisitDirectory visit_directory,
+ VisitSong visit_song,
+ VisitPlaylist visit_playlist,
+ GError **error_r) = 0;
+};
+
+struct DatabasePlugin {
+ const char *name;
+
+ /**
+ * Allocates and configures a database.
+ */
+ Database *(*create)(const struct config_param *param,
+ GError **error_r);
+};
+
+#endif