1 files changed, 58 insertions, 0 deletions
diff --git a/src/db/DatabasePlugin.hxx b/src/db/DatabasePlugin.hxx
new file mode 100644
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--- /dev/null
+++ b/src/db/DatabasePlugin.hxx
@@ -0,0 +1,58 @@
+/*
+ * 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.
+ */
+
+/** \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
+
+struct config_param;
+class Error;
+class EventLoop;
+class DatabaseListener;
+class Database;
+
+struct DatabasePlugin {
+	/**
+	 * This plugin requires a #Storage instance.  It contains only
+	 * cached metadata from files in the #Storage.
+	 */
+	static constexpr unsigned FLAG_REQUIRE_STORAGE = 0x1;
+
+	const char *name;
+
+	unsigned flags;
+
+	/**
+	 * Allocates and configures a database.
+	 */
+	Database *(*create)(EventLoop &loop, DatabaseListener &listener,
+			    const config_param &param,
+			    Error &error);
+
+	constexpr bool RequireStorage() const {
+		return flags & FLAG_REQUIRE_STORAGE;
+	}
+};
+
+#endif