[grilo-plugins] tracker: Do not advertise browse support for the Tracker extractor

[Philip Withnall <pwithnall src gnome org>]

commit 1b1c0d31bdd3f6e1c9c11d7d03a2f9610cc44525
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Mon Apr 20 10:16:09 2015 +0100

    tracker: Do not advertise browse support for the Tracker extractor
    
    The Tracker extractor data source (which appears when using the
    per-device-source option) does not support browsing, only resolving.
    Override the supported_operations vfunc to ensure that GRL_OP_BROWSE is
    not advertised for that source.
    
    This fixes clients which want to browse a single Tracker source (e.g. a
    single removable drive) and are checking for browsability using
    grl_source_supported_operations().
    
    https://bugzilla.gnome.org/show_bug.cgi?id=748173

 src/tracker/grl-tracker-source-api.c |   22 ++++++++++++++++++++++
 src/tracker/grl-tracker-source-api.h |    2 ++
 src/tracker/grl-tracker-source.c     |    1 +
 3 files changed, 25 insertions(+), 0 deletions(-)
---
diff --git a/src/tracker/grl-tracker-source-api.c b/src/tracker/grl-tracker-source-api.c
index 65a8a7a..746ed13 100644
--- a/src/tracker/grl-tracker-source-api.c
+++ b/src/tracker/grl-tracker-source-api.c
@@ -1293,6 +1293,28 @@ grl_tracker_source_get_caps (GrlSource *source,
   return caps;
 }
 
+GrlSupportedOps
+grl_tracker_source_supported_operations (GrlSource *source)
+{
+  gboolean is_extractor;
+  GrlSupportedOps ops;
+
+  /* Always supported operations. */
+  ops = GRL_OP_RESOLVE | GRL_OP_MEDIA_FROM_URI | GRL_OP_SEARCH | GRL_OP_QUERY |
+        GRL_OP_STORE_METADATA | GRL_OP_NOTIFY_CHANGE;
+
+  /* The extractor doesn’t support browsing; only resolving. */
+  is_extractor = g_str_has_prefix (grl_source_get_id (source),
+                                   "http://www.tracker-project.org";
+                                   "/ontologies/tracker"
+                                   "#extractor-data-source,");
+  if (!is_extractor) {
+    ops |= GRL_OP_BROWSE;
+  }
+
+  return ops;
+}
+
 gboolean
 grl_tracker_source_test_media_from_uri (GrlSource *source,
                                         const gchar *uri)
diff --git a/src/tracker/grl-tracker-source-api.h b/src/tracker/grl-tracker-source-api.h
index ef51090..f452e75 100644
--- a/src/tracker/grl-tracker-source-api.h
+++ b/src/tracker/grl-tracker-source-api.h
@@ -66,6 +66,8 @@ gboolean grl_tracker_source_change_stop (GrlSource *source,
 GrlCaps *grl_tracker_source_get_caps (GrlSource *source,
                                       GrlSupportedOps operation);
 
+GrlSupportedOps grl_tracker_source_supported_operations (GrlSource *source);
+
 gboolean grl_tracker_source_test_media_from_uri (GrlSource *source,
                                                  const gchar *uri);
 
diff --git a/src/tracker/grl-tracker-source.c b/src/tracker/grl-tracker-source.c
index 53021c1..858565b 100644
--- a/src/tracker/grl-tracker-source.c
+++ b/src/tracker/grl-tracker-source.c
@@ -110,6 +110,7 @@ grl_tracker_source_class_init (GrlTrackerSourceClass * klass)
   source_class->browse              = grl_tracker_source_browse;
   source_class->notify_change_start = grl_tracker_source_change_start;
   source_class->notify_change_stop  = grl_tracker_source_change_stop;
+  source_class->supported_operations = grl_tracker_source_supported_operations;
   source_class->get_caps            = grl_tracker_source_get_caps;
   source_class->test_media_from_uri = grl_tracker_source_test_media_from_uri;
   source_class->media_from_uri      = grl_tracker_source_get_media_from_uri;