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[tracker/default-values] libtracker-data: Add default value support

commit 50872bbca4357ae71cc2623eb6c2ef6dd1e285c8
Author: Jürg Billeter <j bitron ch>
Date:   Mon Jun 7 10:54:26 2010 +0200

    libtracker-data: Add default value support

 data/ontologies/11-rdf.ontology            |    5 +++
 data/ontologies/91-maemo.ontology          |    3 +-
 src/libtracker-data/tracker-data-manager.c |   48 ++++++++++++++++++++++++++-
 src/libtracker-data/tracker-property.c     |   28 ++++++++++++++++
 src/libtracker-data/tracker-property.h     |    3 ++
 5 files changed, 84 insertions(+), 3 deletions(-)
---
diff --git a/data/ontologies/11-rdf.ontology b/data/ontologies/11-rdf.ontology
index b9e03a2..5d02162 100644
--- a/data/ontologies/11-rdf.ontology
+++ b/data/ontologies/11-rdf.ontology
@@ -112,6 +112,11 @@ tracker:weight a rdf:Property ;
 	rdfs:domain rdf:Property ;
 	rdfs:range xsd:integer .
 
+tracker:defaultValue a rdf:Property ;
+	nrl:maxCardinality 1 ;
+	rdfs:domain rdf:Property ;
+	rdfs:range xsd:string .
+
 tracker:added a rdf:Property ;
 	nrl:maxCardinality 1 ;
 	rdfs:domain rdfs:Resource ;
diff --git a/data/ontologies/91-maemo.ontology b/data/ontologies/91-maemo.ontology
index 6649f16..34ba658 100644
--- a/data/ontologies/91-maemo.ontology
+++ b/data/ontologies/91-maemo.ontology
@@ -46,7 +46,8 @@ maemo:webhistoryThumbnail a rdf:Property ;
 maemo:relevance a rdf:Property ;
         nrl:maxCardinality 1 ;
 	rdfs:domain nie:InformationElement ;
-	rdfs:range xsd:double .
+	rdfs:range xsd:double ;
+	tracker:defaultValue 2 .
 
 # Remote media art for media player
 maemo:remoteMediaArt a rdf:Property ;
diff --git a/src/libtracker-data/tracker-data-manager.c b/src/libtracker-data/tracker-data-manager.c
index f2e8d6e..56ffd91 100644
--- a/src/libtracker-data/tracker-data-manager.c
+++ b/src/libtracker-data/tracker-data-manager.c
@@ -417,6 +417,7 @@ tracker_data_ontology_load_statement (const gchar *ontology_path,
 					tracker_property_set_indexed (property, FALSE);
 					tracker_property_set_secondary_index (property, NULL);
 					tracker_property_set_writeback (property, FALSE);
+					tracker_property_set_default_value (property, NULL);
 				}
 				return;
 			}
@@ -692,6 +693,16 @@ tracker_data_ontology_load_statement (const gchar *ontology_path,
 		if (strcmp (object, "true") == 0) {
 			tracker_property_set_fulltext_no_limit (property, TRUE);
 		}
+	} else if (g_strcmp0 (predicate, TRACKER_PREFIX "defaultValue") == 0) {
+		TrackerProperty *property;
+
+		property = tracker_ontologies_get_property_by_uri (subject);
+		if (property == NULL) {
+			g_critical ("%s: Unknown property %s", ontology_path, subject);
+			return;
+		}
+
+		tracker_property_set_default_value (property, object);
 	} else if (g_strcmp0 (predicate, TRACKER_PREFIX "prefix") == 0) {
 		TrackerNamespace *namespace;
 
@@ -831,6 +842,18 @@ tracker_data_ontology_process_changes (GPtrArray *seen_classes,
 				tracker_class_set_db_schema_changed (class, TRUE);
 				tracker_property_set_db_schema_changed (property, TRUE);
 			}
+
+			/* there is no ALTER COLUMN => change in defaultValue not supported
+			if (update_property_value ("tracker:defaultValue", subject, TRACKER_PREFIX "defaultValue",
+			                           tracker_property_get_default_value (property), 
+			                           NULL, NULL, property)) {
+				TrackerClass *class;
+				TODO
+				class = tracker_property_get_domain (property);
+				tracker_class_set_db_schema_changed (class, TRUE);
+				tracker_property_set_db_schema_changed (property, TRUE);
+			}
+			*/
 		}
 	}
 }
@@ -1412,7 +1435,8 @@ db_get_static_data (TrackerDBInterface *iface)
 	                                              "\"tracker:isAnnotation\", "
 	                                              "\"tracker:writeback\", "
 	                                              "(SELECT 1 FROM \"rdfs:Resource_rdf:type\" WHERE ID = \"rdf:Property\".ID AND "
-	                                              "\"rdf:type\" = (SELECT ID FROM Resource WHERE Uri = '" NRL_INVERSE_FUNCTIONAL_PROPERTY "')) "
+	                                              "\"rdf:type\" = (SELECT ID FROM Resource WHERE Uri = '" NRL_INVERSE_FUNCTIONAL_PROPERTY "')), "
+	                                              "\"tracker:defaultValue\" "
 	                                              "FROM \"rdf:Property\" ORDER BY ID");
 
 	if (stmt) {
@@ -1424,7 +1448,7 @@ db_get_static_data (TrackerDBInterface *iface)
 		while (tracker_db_cursor_iter_next (cursor, &error)) {
 			GValue value = { 0 };
 			TrackerProperty *property;
-			const gchar     *uri, *domain_uri, *range_uri, *secondary_index_uri;
+			const gchar     *uri, *domain_uri, *range_uri, *secondary_index_uri, *default_value;
 			gboolean         multi_valued, indexed, fulltext_indexed, fulltext_no_limit;
 			gboolean         transient, annotation, is_inverse_functional_property;
 			gboolean         writeback;
@@ -1523,6 +1547,8 @@ db_get_static_data (TrackerDBInterface *iface)
 				is_inverse_functional_property = FALSE;
 			}
 
+			default_value = tracker_db_cursor_get_string (cursor, 13);
+
 			tracker_property_set_is_new (property, FALSE);
 			tracker_property_set_transient (property, transient);
 			tracker_property_set_uri (property, uri);
@@ -1531,6 +1557,7 @@ db_get_static_data (TrackerDBInterface *iface)
 			tracker_property_set_range (property, tracker_ontologies_get_class_by_uri (range_uri));
 			tracker_property_set_multiple_values (property, multi_valued);
 			tracker_property_set_indexed (property, indexed);
+			tracker_property_set_default_value (property, default_value);
 
 			tracker_property_set_db_schema_changed (property, FALSE);
 			tracker_property_set_writeback (property, writeback);
@@ -1880,8 +1907,12 @@ create_decomposed_metadata_tables (TrackerDBInterface *iface,
 			field_name = tracker_property_get_name (property);
 
 			if (sql_type_for_single_value) {
+				const gchar *default_value;
+
 				/* single value */
 
+				default_value = tracker_property_get_default_value (property);
+
 				if (in_update) {
 					g_debug ("%sAltering database for class '%s' property '%s': single value (%s)",
 					         in_alter ? "" : "  ", 
@@ -1897,6 +1928,13 @@ create_decomposed_metadata_tables (TrackerDBInterface *iface,
 					g_string_append_printf (create_sql, ", \"%s\" %s",
 					                        field_name,
 					                        sql_type_for_single_value);
+
+					/* add DEFAULT in case that the ontology specifies a default value,
+					   assumes that default values never contain quotes */
+					if (default_value != NULL) {
+						g_string_append_printf (create_sql, " DEFAULT '%s'", default_value);
+					}
+
 					if (tracker_property_get_is_inverse_functional_property (property)) {
 						g_string_append (create_sql, " UNIQUE");
 					}
@@ -1923,6 +1961,12 @@ create_decomposed_metadata_tables (TrackerDBInterface *iface,
 					                        service_name,
 					                        field_name,
 					                        sql_type_for_single_value);
+
+					/* add DEFAULT in case that the ontology specifies a default value,
+					   assumes that default values never contain quotes */
+					if (default_value != NULL) {
+						g_string_append_printf (alter_sql, " DEFAULT '%s'", default_value);
+					}
 					if (tracker_property_get_is_inverse_functional_property (property)) {
 						g_string_append (alter_sql, " UNIQUE");
 					}
diff --git a/src/libtracker-data/tracker-property.c b/src/libtracker-data/tracker-property.c
index bcb715f..9e8ad3a 100644
--- a/src/libtracker-data/tracker-property.c
+++ b/src/libtracker-data/tracker-property.c
@@ -61,6 +61,7 @@ struct _TrackerPropertyPrivate {
 	gboolean       is_new;
 	gboolean       db_schema_changed;
 	gboolean       writeback;
+	gchar         *default_value;
 
 	GArray        *super_properties;
 };
@@ -162,6 +163,8 @@ property_finalize (GObject *object)
 
 	g_array_free (priv->super_properties, TRUE);
 
+	g_free (priv->default_value);
+
 	(G_OBJECT_CLASS (tracker_property_parent_class)->finalize) (object);
 }
 
@@ -439,6 +442,18 @@ tracker_property_get_super_properties (TrackerProperty *property)
 	return (TrackerProperty **) priv->super_properties->data;
 }
 
+const gchar *
+tracker_property_get_default_value (TrackerProperty *property)
+{
+	TrackerPropertyPrivate *priv;
+
+	g_return_val_if_fail (TRACKER_IS_PROPERTY (property), NULL);
+
+	priv = GET_PRIV (property);
+
+	return priv->default_value;
+}
+
 void
 tracker_property_set_uri (TrackerProperty *property,
                           const gchar     *value)
@@ -730,3 +745,16 @@ tracker_property_add_super_property (TrackerProperty *property,
 	g_array_append_val (priv->super_properties, value);
 }
 
+void
+tracker_property_set_default_value (TrackerProperty *property,
+                                    const gchar     *value)
+{
+	TrackerPropertyPrivate *priv;
+
+	g_return_if_fail (TRACKER_IS_PROPERTY (property));
+
+	priv = GET_PRIV (property);
+
+	g_free (priv->default_value);
+	priv->default_value = g_strdup (value);
+}
diff --git a/src/libtracker-data/tracker-property.h b/src/libtracker-data/tracker-property.h
index c3a2c16..5ee3561 100644
--- a/src/libtracker-data/tracker-property.h
+++ b/src/libtracker-data/tracker-property.h
@@ -91,6 +91,7 @@ gboolean            tracker_property_get_multiple_values   (TrackerProperty
 gboolean            tracker_property_get_transient         (TrackerProperty      *property);
 gboolean            tracker_property_get_is_new            (TrackerProperty      *property);
 gboolean            tracker_property_get_writeback         (TrackerProperty      *property);
+const gchar *       tracker_property_get_default_value     (TrackerProperty      *property);
 gboolean            tracker_property_get_db_schema_changed (TrackerProperty      *property);
 gboolean            tracker_property_get_is_inverse_functional_property
 (TrackerProperty      *property);
@@ -123,6 +124,8 @@ void                tracker_property_set_is_new            (TrackerProperty
                                                             gboolean              value);
 void                tracker_property_set_writeback         (TrackerProperty      *property,
                                                             gboolean              value);
+void                tracker_property_set_default_value     (TrackerProperty      *property,
+                                                            const gchar          *value);
 void                tracker_property_set_db_schema_changed (TrackerProperty      *property,
                                                             gboolean              value);
 void                tracker_property_set_is_inverse_functional_property
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