[grilo] core: Implemented grl_multiple_get_media_from_site().

[Iago Toral Quiroga <itoral src gnome org>]

commit b566d3ca4475b87d1f8ce8add55b08b47a6865b0
Author: Iago Toral Quiroga <itoral igalia com>
Date:   Wed Dec 1 18:52:40 2010 +0100

    core: Implemented grl_multiple_get_media_from_site().
    
    This function goes through all sources that implement GRL_OP_MEDIA_FROM_SITE
    looking for the first one capable of instantiating a GrlMedia object that
    represents the media resource exposed by certain site URI. Basically, it is
    a convenience function to exploit grl_media_source_get_media_from_site().
    
    https://bugzilla.gnome.org/show_bug.cgi?id=635394

 src/grl-error.h    |    2 +
 src/grl-multiple.c |  100 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/grl-multiple.h |    4 ++
 3 files changed, 106 insertions(+), 0 deletions(-)
---
diff --git a/src/grl-error.h b/src/grl-error.h
index 6c91763..c6e42d0 100644
--- a/src/grl-error.h
+++ b/src/grl-error.h
@@ -47,6 +47,7 @@
  * @GRL_CORE_ERROR_STORE_FAILED: The store operation failed
  * @GRL_CORE_ERROR_REMOVE_FAILED: The removal operation failed
  * @GRL_CORE_ERROR_SET_METADATA_FAILED: The set metadata operation failed
+ * @GRL_CORE_ERROR_MEDIA_FROM_URI_FAILED: The media from_uri operation failed
  *
  * These constants identify all the available core errors
  */
@@ -60,6 +61,7 @@ typedef enum {
   GRL_CORE_ERROR_STORE_FAILED,
   GRL_CORE_ERROR_REMOVE_FAILED,
   GRL_CORE_ERROR_SET_METADATA_FAILED,
+  GRL_CORE_ERROR_MEDIA_FROM_SITE_FAILED,
 } GrlCoreError;
 
 #endif /* _GRL_ERROR_H_ */
diff --git a/src/grl-multiple.c b/src/grl-multiple.c
index d651fa0..d342797 100644
--- a/src/grl-multiple.c
+++ b/src/grl-multiple.c
@@ -72,6 +72,12 @@ struct CallbackData {
   gpointer user_data;
 };
 
+struct MediaFromSiteCallbackData {
+  gchar *site_uri;
+  GrlMediaSourceMetadataCb user_callback;
+  gpointer user_data;
+};
+
 static void multiple_search_cb (GrlMediaSource *source,
 				guint search_id,
 				GrlMedia *media,
@@ -429,6 +435,40 @@ multiple_search_cb (GrlMediaSource *source,
   g_hash_table_remove (pending_operations, GINT_TO_POINTER (msd->search_id));
 }
 
+static void
+free_media_from_site_data (struct MediaFromSiteCallbackData *mfscd)
+{
+  GRL_DEBUG ("free_media_from_site_data");
+  g_free (mfscd->site_uri);
+  g_free (mfscd);
+}
+
+static void
+media_from_site_cb (GrlMediaSource *source,
+		    GrlMedia *media,
+		    gpointer user_data,
+		    const GError *error)
+{
+  struct MediaFromSiteCallbackData *mfscd =
+    (struct MediaFromSiteCallbackData *) user_data;
+
+  if (error) {
+    mfscd->user_callback (NULL, NULL, mfscd->user_data, error);
+  } else if (media) {
+    mfscd->user_callback (source, media, mfscd->user_data, NULL);
+  } else {
+    GError *_error = g_error_new (GRL_CORE_ERROR,
+				  GRL_CORE_ERROR_MEDIA_FROM_SITE_FAILED,
+				  "Could not resolve media for site URI '%s'",
+				  mfscd->site_uri);
+
+    mfscd->user_callback (source, media, mfscd->user_data, _error);
+    g_error_free (_error);
+  }
+
+  free_media_from_site_data (mfscd);
+}
+
 /* ================ API ================ */
 
 /**
@@ -619,3 +659,63 @@ grl_multiple_search_sync (const GList *sources,
 
   return result;
 }
+
+/**
+ * grl_multiple_get_media_from_site:
+ * @site_uri: Site URI where the media is exposed.
+ * @callback: (scope notified): the user defined callback
+ * @user_data: the user data to pass to the user callback
+ *
+ * Goes though all available media sources until it finds one capable of
+ * constructing a GrlMedia object representing the media resource exposed
+ * by @site_url.
+ *
+ * This method is asynchronous.
+ */
+void
+grl_multiple_get_media_from_site (const gchar *site_uri,
+				  GrlMediaSourceMetadataCb callback,
+				  gpointer user_data)
+{
+  GrlPluginRegistry *registry;
+  GList *sources, *iter;
+  gboolean found = FALSE;
+
+  g_return_if_fail (site_uri != NULL);
+  g_return_if_fail (callback != NULL);
+
+  registry = grl_plugin_registry_get_default ();
+  sources =
+    grl_plugin_registry_get_sources_by_operations (registry,
+						   GRL_OP_MEDIA_FROM_SITE,
+						   TRUE);
+
+  /* Look for the first source that knows how to deal with 'site_uri' */
+  iter = sources;
+  while (iter && !found) {
+    GrlMediaSource *source = GRL_MEDIA_SOURCE (iter->data);
+    if (grl_media_source_test_media_from_site (source, site_uri)) {
+      struct MediaFromSiteCallbackData *mfscd =
+	g_new0 (struct MediaFromSiteCallbackData, 1);
+
+      mfscd->user_callback = callback;
+      mfscd->user_data = user_data;
+      mfscd->site_uri = g_strdup (site_uri);
+
+      grl_media_source_get_media_from_site (source,
+					    site_uri,
+					    media_from_site_cb,
+					    mfscd);
+      found = TRUE;
+    }
+    iter = g_list_next (iter);
+  }
+
+  g_list_free (sources);
+
+  /* No source knows how to deal with 'site_uri', invoke user callback
+     with NULL GrlMedia */
+  if (!found) {
+    callback (NULL, NULL, user_data, NULL);
+  }
+}
diff --git a/src/grl-multiple.h b/src/grl-multiple.h
index ebbe243..1bb9c44 100644
--- a/src/grl-multiple.h
+++ b/src/grl-multiple.h
@@ -48,4 +48,8 @@ GList *grl_multiple_search_sync (const GList *sources,
 
 void grl_multiple_cancel (guint search_id);
 
+void grl_multiple_get_media_from_site (const gchar *site_uri,
+				       GrlMediaSourceMetadataCb callback,
+				       gpointer user_data);
+
 #endif