[grilo-plugins] tracker: more accurate supported keys

[Juan A. Suarez Romero <jasuarez src gnome org>]

commit f66958993ffa415a2147d3532e7fe316245f12fd
Author: Lionel Landwerlin <lionel g landwerlin linux intel com>
Date:   Wed Mar 30 11:36:27 2011 +0100

    tracker: more accurate supported keys
    
    Signed-off-by: Lionel Landwerlin <lionel g landwerlin linux intel com>

 src/media/tracker/grl-tracker-utils.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/src/media/tracker/grl-tracker-utils.c b/src/media/tracker/grl-tracker-utils.c
index e4a1205..14eecee 100644
--- a/src/media/tracker/grl-tracker-utils.c
+++ b/src/media/tracker/grl-tracker-utils.c
@@ -615,6 +615,11 @@ grl_tracker_get_media_name (const gchar *rdf_type,
 const GList *
 grl_tracker_supported_keys (GrlMetadataSource *source)
 {
-  return
-    grl_plugin_registry_get_metadata_keys (grl_plugin_registry_get_default ());
+  static GList *supported_keys = NULL;
+
+  if (!supported_keys) {
+    supported_keys =  g_hash_table_get_keys (grl_to_sparql_mapping);
+  }
+
+  return supported_keys;
 }