[tracker/wip/carlosg/sparql-parser-ng: 15/43] libtracker-data: Add method to fetch unused URNs

[Carlos Garnacho <carlosg src gnome org>]

commit 6df5550fffd431f1480450333379a4af0718100d
Author: Carlos Garnacho <carlosg gnome org>
Date:   Fri Aug 31 11:43:38 2018 +0200

    libtracker-data: Add method to fetch unused URNs

 src/libtracker-data/tracker-data-query.c | 33 ++++++++++++++++++++++++++++++++
 src/libtracker-data/tracker-data-query.h |  3 +++
 2 files changed, 36 insertions(+)
---
diff --git a/src/libtracker-data/tracker-data-query.c b/src/libtracker-data/tracker-data-query.c
index bce3e93a8..b6f553fbb 100644
--- a/src/libtracker-data/tracker-data-query.c
+++ b/src/libtracker-data/tracker-data-query.c
@@ -130,6 +130,39 @@ tracker_data_query_resource_id (TrackerDataManager *manager,
        return id;
 }
 
+gchar *
+tracker_data_query_unused_uuid (TrackerDataManager *manager,
+                                TrackerDBInterface *iface)
+{
+       TrackerDBCursor *cursor = NULL;
+       TrackerDBStatement *stmt;
+       GError *error = NULL;
+       gchar *uuid = NULL;
+
+       stmt = tracker_db_interface_create_statement (iface, TRACKER_DB_STATEMENT_CACHE_TYPE_SELECT, &error,
+                                                     "SELECT SparqlUUID()");
+
+       if (stmt) {
+               cursor = tracker_db_statement_start_cursor (stmt, &error);
+               g_object_unref (stmt);
+       }
+
+       if (cursor) {
+               if (tracker_db_cursor_iter_next (cursor, NULL, &error)) {
+                       uuid = g_strdup (tracker_db_cursor_get_string (cursor, 0, NULL));
+               }
+
+               g_object_unref (cursor);
+       }
+
+       if (G_UNLIKELY (error)) {
+               g_critical ("Could not query resource ID: %s\n", error->message);
+               g_error_free (error);
+       }
+
+       return uuid;
+}
+
 
 TrackerDBCursor *
 tracker_data_query_sparql_cursor (TrackerDataManager  *manager,
diff --git a/src/libtracker-data/tracker-data-query.h b/src/libtracker-data/tracker-data-query.h
index 1add89f91..3b2df21fd 100644
--- a/src/libtracker-data/tracker-data-query.h
+++ b/src/libtracker-data/tracker-data-query.h
@@ -37,6 +37,9 @@ G_BEGIN_DECLS
 gint                 tracker_data_query_resource_id   (TrackerDataManager  *manager,
                                                        TrackerDBInterface  *iface,
                                                        const gchar         *uri);
+gchar               *tracker_data_query_unused_uuid   (TrackerDataManager  *manager,
+                                                       TrackerDBInterface  *iface);
+
 TrackerDBCursor     *tracker_data_query_sparql_cursor (TrackerDataManager  *manager,
                                                        const gchar         *query,
                                                        GError             **error);