[grilo] core: Add synchronous version of grl_metadata_source_set_metadata_sync() function

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

commit 927c30f42ecbe9e6871eadd6c57543599e13a4c9
Author: Juan A. Suarez Romero <jasuarez igalia com>
Date:   Thu Jul 15 14:49:59 2010 +0200

    core: Add synchronous version of grl_metadata_source_set_metadata_sync() function

 src/grl-metadata-source.c |   73 +++++++++++++++++++++++++++++++++++++++++++++
 src/grl-metadata-source.h |    6 ++++
 2 files changed, 79 insertions(+), 0 deletions(-)
---
diff --git a/src/grl-metadata-source.c b/src/grl-metadata-source.c
index 519c5fa..622d4fd 100644
--- a/src/grl-metadata-source.c
+++ b/src/grl-metadata-source.c
@@ -381,6 +381,25 @@ resolve_result_async_cb (GrlMetadataSource *source,
   ds->complete = TRUE;
 }
 
+static void
+set_metadata_result_async_cb (GrlMetadataSource *source,
+                              GrlMedia *media,
+                              GList *failed_keys,
+                              gpointer user_data,
+                              const GError *error)
+{
+  GrlDataSync *ds = (GrlDataSync *) user_data;
+
+  g_debug ("resolve_result_async_cb");
+
+  if (error) {
+    ds->error = g_error_copy (error);
+  }
+
+  ds->data = g_list_copy (failed_keys);
+  ds->complete = TRUE;
+}
+
 static gboolean
 set_metadata_idle (gpointer user_data)
 {
@@ -1127,6 +1146,60 @@ grl_metadata_source_set_metadata (GrlMetadataSource *source,
 }
 
 /**
+ * grl_metadata_source_set_metadata_sync:
+ * @source: a metadata source
+ * @media: the #GrlMedia object that we want to operate on
+ * @key: a #GrlKeyID which value we want to change
+ * @error: a #GError, or @NULL
+ * @callback: the callback to execute when the operation is finished
+ * @user_data: user data set for the @callback
+ *
+ * This is the main method of the #GrlMetadataSource class. It will
+ * get the value for @key from @media and store it permanently. After
+ * calling this method, future queries that return this media object
+ * shall return this new value for the selected key.
+ *
+ * This function is synchronous.
+ *
+ * Returns: a #GList of keys that could not be updated, or @NULL
+ */
+GList *
+grl_metadata_source_set_metadata_sync (GrlMetadataSource *source,
+                                       GrlMedia *media,
+                                       GList *keys,
+                                       GrlMetadataWritingFlags flags,
+                                       GError **error)
+{
+  GrlDataSync *ds;
+  GList *failed;
+
+  ds = g_slice_new0 (GrlDataSync);
+
+  grl_metadata_source_set_metadata (source,
+                                    media,
+                                    keys,
+                                    flags,
+                                    set_metadata_result_async_cb,
+                                    ds);
+
+  grl_wait_for_async_operation_complete (ds);
+
+  if (ds->error) {
+    if (error) {
+      *error = ds->error;
+    } else {
+      g_error_free (ds->error);
+    }
+  }
+
+  failed = ds->data;
+
+  g_slice_free (GrlDataSync, ds);
+
+  return failed;
+}
+
+/**
  * grl_metadata_source_supported_operations:
  * @source: a metadata source
  *
diff --git a/src/grl-metadata-source.h b/src/grl-metadata-source.h
index 150f63f..1cb7378 100644
--- a/src/grl-metadata-source.h
+++ b/src/grl-metadata-source.h
@@ -296,6 +296,12 @@ void grl_metadata_source_set_metadata (GrlMetadataSource *source,
 				       GrlMetadataSourceSetMetadataCb callback,
 				       gpointer user_data);
 
+GList *grl_metadata_source_set_metadata_sync (GrlMetadataSource *source,
+                                              GrlMedia *media,
+                                              GList *keys,
+                                              GrlMetadataWritingFlags flags,
+                                              GError **error);
+
 const gchar *grl_metadata_source_get_id (GrlMetadataSource *source);
 
 const gchar *grl_metadata_source_get_name (GrlMetadataSource *source);