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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.
+ */
+
+#ifndef MPD_DB_VISITOR_H
+#define MPD_DB_VISITOR_H
+
+struct directory;
+struct song;
+struct playlist_metadata;
+
+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);
+
+ /**
+ * Visit a playlist. Optional method.
+ *
+ * @param directory the directory the playlist resides in
+ * @return true to continue the operation, false on error (set error_r)
+ */
+ bool (*playlist)(const struct playlist_metadata *playlist,
+ const struct directory *directory, void *ctx,
+ GError **error_r);
+};
+
+#endif