[tracker] examples: Don't forget class-signal.c

[Martyn James Russell <mr src gnome org>]

commit 4d2e3174040bc169d97b5482a166e9491a70b229
Author: Martyn Russell <martyn lanedo com>
Date:   Wed Mar 2 11:06:53 2011 +0000

    examples: Don't forget class-signal.c

 examples/libtracker-sparql/class-signal.c |  111 +++++++++++++++++++++++++++++
 1 files changed, 111 insertions(+), 0 deletions(-)
---
diff --git a/examples/libtracker-sparql/class-signal.c b/examples/libtracker-sparql/class-signal.c
new file mode 100644
index 0000000..65750c2
--- /dev/null
+++ b/examples/libtracker-sparql/class-signal.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2009, Nokia <ivan frade nokia com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.          See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ */
+
+#include <gio/gio.h>
+
+#include <libtracker-sparql/tracker-sparql.h>
+
+static TrackerSparqlConnection *con;
+
+static void
+handle_statement (gint subject, gint predicate)
+{
+	gchar *query, *pred;
+	TrackerSparqlCursor *cursor;
+
+	query = g_strdup_printf ("SELECT tracker:uri (%d) tracker:uri(%d) {}",
+	                         subject, predicate);
+	cursor = tracker_sparql_connection_query (con, query, NULL, NULL);
+	g_free (query);
+	tracker_sparql_cursor_next (cursor, NULL, NULL);
+	pred = g_strdup (tracker_sparql_cursor_get_string (cursor, 1, NULL));
+	query = g_strdup_printf ("SELECT ?t { <%s> <%s> ?t }",
+	                         tracker_sparql_cursor_get_string (cursor, 0, NULL),
+	                         pred);
+	g_object_unref (cursor);
+	cursor = tracker_sparql_connection_query (con, query, NULL, NULL);
+	g_free (query);
+	while (tracker_sparql_cursor_next (cursor, NULL, NULL))
+		g_print ("\t%s = %s\n", pred, tracker_sparql_cursor_get_string (cursor, 0, NULL));
+	g_print ("\n");
+	g_free (pred);
+	g_object_unref (cursor);
+}
+
+static void
+class_signal_cb (GDBusConnection *connection,
+                 const gchar     *sender_name,
+                 const gchar     *object_path,
+                 const gchar     *interface_name,
+                 const gchar     *signal_name,
+                 GVariant        *parameters,
+                 gpointer         user_data)
+
+{
+	GVariantIter *iter1, *iter2;
+	gchar *class_name;
+	gint graph = 0, subject = 0, predicate = 0, object = 0;
+
+	g_variant_get (parameters, "(&sa(iiii)a(iiii))", &class_name, &iter1, &iter2);
+	g_print ("%s:\n", class_name);
+
+	while (g_variant_iter_loop (iter1, "(iiii)", &graph, &subject, &predicate, &object)) {
+		handle_statement (subject, predicate);
+	}
+
+	while (g_variant_iter_loop (iter2, "(iiii)", &graph, &subject, &predicate, &object)) {
+		handle_statement (subject, predicate);
+	}
+
+	g_variant_iter_free (iter1);
+	g_variant_iter_free (iter2);
+}
+
+gint
+main (gint argc, gchar *argv[])
+{
+	GMainLoop *loop;
+	GError *error = NULL;
+	GDBusConnection *connection;
+	guint signal_id;
+
+	g_type_init ();
+	loop = g_main_loop_new (NULL, FALSE);
+	con = tracker_sparql_connection_get (NULL, &error);
+	connection = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, NULL);
+
+	signal_id = g_dbus_connection_signal_subscribe (connection,
+	                                                TRACKER_DBUS_SERVICE,
+	                                                TRACKER_DBUS_INTERFACE_RESOURCES,
+	                                                "GraphUpdated",
+	                                                TRACKER_DBUS_OBJECT_RESOURCES,
+	                                                NULL, /* Use class-name here */
+	                                                G_DBUS_SIGNAL_FLAGS_NONE,
+	                                                class_signal_cb,
+	                                                NULL,
+	                                                NULL);
+
+	g_main_loop_run (loop);
+	g_dbus_connection_signal_unsubscribe (connection, signal_id);
+	g_main_loop_unref (loop);
+	g_object_unref (con);
+	g_object_unref (connection);
+
+	return 0;
+}