[tracker/property-changes: 2/6] libtracker-data: Support for ontology change tracker:notify and tracker:writeback

[Philip Van Hoof <pvanhoof src gnome org>]

commit cde563b3a04eb7665db3bb32f4393a2bb2564d7a
Author: Philip Van Hoof <philip codeminded be>
Date:   Wed Mar 31 11:40:57 2010 +0200

    libtracker-data: Support for ontology change tracker:notify and tracker:writeback
    
    s

 src/libtracker-data/tracker-data-manager.c |   98 ++++++++++++++++++++++++++-
 1 files changed, 94 insertions(+), 4 deletions(-)
---
diff --git a/src/libtracker-data/tracker-data-manager.c b/src/libtracker-data/tracker-data-manager.c
index ef29b66..f4f9388 100644
--- a/src/libtracker-data/tracker-data-manager.c
+++ b/src/libtracker-data/tracker-data-manager.c
@@ -46,6 +46,7 @@
 #include "tracker-ontology.h"
 #include "tracker-property.h"
 #include "tracker-sparql-query.h"
+#include "tracker-data-query.h"
 
 #define RDF_PREFIX TRACKER_RDF_PREFIX
 #define RDF_PROPERTY RDF_PREFIX "Property"
@@ -69,9 +70,59 @@
 
 #define ZLIBBUFSIZ 8192
 
-static gchar              *ontologies_dir;
-static gboolean            initialized;
-static gboolean            in_journal_replay;
+static gchar    *ontologies_dir;
+static gboolean  initialized;
+static gboolean  in_journal_replay;
+
+static void
+notify_and_writeback_helper (const gchar *kind,
+                             const gchar *subject,
+                             const gchar *predicate,
+                             const gchar *object)
+{
+	GError *error = NULL;
+	TrackerDBResultSet *result_set;
+	gchar *query;
+	gboolean needed = TRUE;
+
+	query = g_strdup_printf ("SELECT ?old_value WHERE { "
+	                           "<%s> tracker:%s ?old_value "
+	                         "}", subject, kind);
+
+	result_set = tracker_data_query_sparql (query, &error);
+
+	g_free (query);
+
+	if (!error && result_set) {
+		gchar *str = NULL;
+
+		tracker_db_result_set_get (result_set, 0, &str, -1);
+
+		if (g_strcmp0 (object, str) == 0) {
+			needed = FALSE;
+		} else {
+			tracker_data_delete_statement (NULL, subject, predicate, str, &error);
+		}
+
+		g_free (str);
+	}
+
+	if (result_set) {
+		g_object_unref (result_set);
+	}
+
+	if (!error && needed) {
+		tracker_data_insert_statement_with_string (NULL, subject,
+		                                           predicate, object,
+		                                           &error);
+	}
+
+	if (error) {
+		g_critical ("Can't update %s for %s: %s",
+		            kind, subject, error->message);
+		g_error_free (error);
+	}
+}
 
 void
 tracker_data_ontology_load_statement (const gchar *ontology_path,
@@ -198,6 +249,42 @@ tracker_data_ontology_load_statement (const gchar *ontology_path,
 		}
 
 		tracker_class_add_super_class (class, super_class);
+	} else if (g_strcmp0 (predicate, TRACKER_PREFIX "notify") == 0) {
+		TrackerClass *class;
+		gboolean wanted_value;
+
+		class = tracker_ontologies_get_class_by_uri (subject);
+		if (class == NULL) {
+			g_critical ("%s: Unknown class %s", ontology_path, subject);
+			return;
+		}
+
+		if (strcmp (object, "true") == 0) {
+			wanted_value = TRUE;
+		}
+
+		if (tracker_class_get_is_new (class) != in_update) {
+			notify_and_writeback_helper ("notify", subject, predicate, object);
+		}
+
+	} else if (g_strcmp0 (predicate, TRACKER_PREFIX "writeback") == 0) {
+		TrackerProperty *property;
+		gboolean wanted_value;
+
+		property = tracker_ontologies_get_property_by_uri (subject);
+		if (property == NULL) {
+			g_critical ("%s: Unknown property %s", ontology_path, subject);
+			return;
+		}
+
+		if (strcmp (object, "true") == 0) {
+			wanted_value = TRUE;
+		}
+
+		if (tracker_property_get_is_new (property) != in_update) {
+			notify_and_writeback_helper ("writeback", subject, predicate, object);
+		}
+
 	} else if (g_strcmp0 (predicate, RDFS_SUB_PROPERTY_OF) == 0) {
 		TrackerProperty *property, *super_property;
 
@@ -349,6 +436,10 @@ tracker_data_ontology_load_statement (const gchar *ontology_path,
 			return;
 		}
 
+		if (tracker_property_get_is_new (property) != in_update) {
+			return;
+		}
+
 		if (strcmp (object, "true") == 0) {
 			tracker_property_set_fulltext_no_limit (property, TRUE);
 		}
@@ -381,7 +472,6 @@ tracker_data_ontology_load_statement (const gchar *ontology_path,
 
 		tracker_ontology_set_last_modified (ontology, tracker_string_to_date (object, NULL, NULL));
 	}
-
 }
 
 static void