[tracker/urn-in-extractor: 2/3] libtracker-extract: Add tracker_extract_get_urn().

[Carlos Garnacho <carlosg src gnome org>]

commit 5f79c9b7768b6f30b4b9cc03184f4fe3b80e8187
Author: Carlos Garnacho <carlos lanedo com>
Date:   Wed Feb 24 11:05:00 2010 +0100

    libtracker-extract: Add tracker_extract_get_urn().
    
    This is a helper function so extractor implementations may know
    the item URN if there is any at the moment of metadata extraction,
    else NULL will be returned.

 src/libtracker-extract/tracker-extract.h |   11 +++++++++++
 src/tracker-extract/tracker-extract.c    |   21 +++++++++++++++++++++
 2 files changed, 32 insertions(+), 0 deletions(-)
---
diff --git a/src/libtracker-extract/tracker-extract.h b/src/libtracker-extract/tracker-extract.h
index 88eece1..fcfc062 100644
--- a/src/libtracker-extract/tracker-extract.h
+++ b/src/libtracker-extract/tracker-extract.h
@@ -175,6 +175,17 @@ typedef TrackerExtractData * (*TrackerExtractDataFunc) (void);
  */
 TrackerExtractData *tracker_extract_get_data (void);
 
+/**
+ * tracker_extract_get_urn:
+ *
+ * Returns the URN for the element being inspected, or %NULL if none.
+ *
+ * Returns: The element URN or %NULL. This string is owned by
+ *          tracker-extract and  must not be freed.
+ */
+G_CONST_RETURN gchar * tracker_extract_get_urn (void);
+
 G_END_DECLS
 
 #endif /* __LIBTRACKER_EXTRACT_EXTRACT_H__ */
+
diff --git a/src/tracker-extract/tracker-extract.c b/src/tracker-extract/tracker-extract.c
index 2304794..43467db 100644
--- a/src/tracker-extract/tracker-extract.c
+++ b/src/tracker-extract/tracker-extract.c
@@ -48,6 +48,7 @@
 #define TRACKER_EXTRACT_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), TRACKER_TYPE_EXTRACT, TrackerExtractPrivate))
 
 extern gboolean debug;
+static gchar *current_item_urn = NULL;
 
 typedef struct {
 	GArray *specific_extractors;
@@ -214,6 +215,25 @@ tracker_extract_new (gboolean disable_shutdown,
 	return object;
 }
 
+static void
+_tracker_extract_set_urn (const gchar *new_urn)
+{
+	if (current_item_urn) {
+		g_free (current_item_urn);
+		current_item_urn = NULL;
+	}
+
+	if (new_urn && *new_urn) {
+		current_item_urn = g_strdup (new_urn);
+	}
+}
+
+G_CONST_RETURN gchar *
+tracker_extract_get_urn (void)
+{
+	return current_item_urn;
+}
+
 static gboolean
 get_file_metadata (TrackerExtract         *extract,
                    guint                   request_id,
@@ -527,6 +547,7 @@ tracker_extract_get_metadata (TrackerExtract         *object,
 		alarm (MAX_EXTRACT_TIME);
 	}
 
+	_tracker_extract_set_urn (urn);
 	extracted = get_file_metadata (object, request_id, context, uri, mime, &preupdate, &sparql);
 
 	if (extracted) {