database: add struct db_visitor

Use this struct for db_walk().

1 files changed, 43 insertions, 0 deletions

diff --git a/src/db_visitor.h b/src/db_visitor.h
new file mode 100644
index 000000000..3eb215c86
--- /dev/null
+++ b/src/db_visitor.h
@@ -0,0 +1,43 @@
+/*
+ * 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_DB_VISITOR_H
+#define MPD_DB_VISITOR_H
+
+struct directory;
+struct song;
+
+struct db_visitor {
+	/**
+	 * Visit a directory.  Optional method.
+	 *
+	 * @return true to continue the operation, false on error (set error_r)
+	 */
+	bool (*directory)(const struct directory *directory, void *ctx,
+			  GError **error_r);
+
+	/**
+	 * Visit a song.  Optional method.
+	 *
+	 * @return true to continue the operation, false on error (set error_r)
+	 */
+	bool (*song)(struct song *song, void *ctx, GError **error_r);
+};
+
+#endif