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-rw-r--r--src/PlaylistUpdate.cxx80
1 files changed, 80 insertions, 0 deletions
diff --git a/src/PlaylistUpdate.cxx b/src/PlaylistUpdate.cxx
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+++ b/src/PlaylistUpdate.cxx
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+/*
+ * Copyright (C) 2003-2013 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.
+ */
+
+#include "config.h"
+#include "Playlist.hxx"
+#include "DatabaseGlue.hxx"
+#include "DatabasePlugin.hxx"
+#include "Song.hxx"
+#include "tag/Tag.hxx"
+#include "Idle.hxx"
+#include "util/Error.hxx"
+
+static bool
+UpdatePlaylistSong(const Database &db, Song &song)
+{
+ if (!song.IsInDatabase() || !song.IsDetached())
+ /* only update Songs instances that are "detached"
+ from the Database */
+ return false;
+
+ Song *original = db.GetSong(song.uri, IgnoreError());
+ if (original == nullptr)
+ /* not found - shouldn't happen, because the update
+ thread should ensure that all stale Song instances
+ have been purged */
+ return false;
+
+ if (original->mtime == song.mtime) {
+ /* not modified */
+ db.ReturnSong(original);
+ return false;
+ }
+
+ song.mtime = original->mtime;
+
+ if (original->tag != nullptr)
+ song.ReplaceTag(Tag(*original->tag));
+
+ db.ReturnSong(original);
+ return true;
+}
+
+void
+playlist::DatabaseModified()
+{
+ const Database *db = GetDatabase();
+ if (db == nullptr)
+ /* how can this ever happen? */
+ return;
+
+ bool modified = false;
+
+ for (unsigned i = 0, n = queue.GetLength(); i != n; ++i) {
+ if (UpdatePlaylistSong(*db, queue.Get(i))) {
+ queue.ModifyAtPosition(i);
+ modified = true;
+ }
+ }
+
+ if (modified) {
+ queue.IncrementVersion();
+ idle_add(IDLE_PLAYLIST);
+ }
+}