[tracker/class-signal: 36/61] examples: class-signal: Add example in plain C

[Philip Van Hoof <pvanhoof src gnome org>]

commit 9fd50b2d9521af082cf9a35425757405548d719d
Author: Philip Van Hoof <philip codeminded be>
Date:   Tue Aug 24 17:16:54 2010 +0200

    examples: class-signal: Add example in plain C

 configure.ac                         |    1 +
 examples/Makefile.am                 |    3 +-
 examples/class-signal/Makefile.am    |   20 +++++
 examples/class-signal/class-signal.c |  132 ++++++++++++++++++++++++++++++++++
 4 files changed, 155 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index cc86170..e8b766f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1983,6 +1983,7 @@ AC_CONFIG_FILES([
 	examples/libtracker-extract/Makefile
 	examples/libtracker-miner/Makefile
 	examples/rss-reader/Makefile
+	examples/class-signal/Makefile
 ])
 
 AC_OUTPUT
diff --git a/examples/Makefile.am b/examples/Makefile.am
index 41a8a67..de2b2a9 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -3,4 +3,5 @@ include $(top_srcdir)/Makefile.decl
 SUBDIRS = 			\
 	libtracker-extract	\
 	libtracker-miner	\
-	rss-reader
+	rss-reader		\
+	class-signal
diff --git a/examples/class-signal/Makefile.am b/examples/class-signal/Makefile.am
new file mode 100644
index 0000000..8774fce
--- /dev/null
+++ b/examples/class-signal/Makefile.am
@@ -0,0 +1,20 @@
+include $(top_srcdir)/Makefile.decl
+
+INCLUDES = \
+	-I$(top_srcdir)/src/libtracker-sparql \
+	-I$(top_srcdir)/src \
+	$(WARN_CFLAGS) \
+	$(DBUS_CFLAGS) \
+	$(GLIB2_CFLAGS) \
+	$(GIO_CFLAGS) \
+	$(GTHREAD_CFLAGS)
+
+noinst_PROGRAMS = class-signal
+
+class_signal_SOURCES = class-signal.c
+
+class_signal_LDADD = \
+	$(top_builddir)/src/libtracker-sparql/libtracker-sparql-$(TRACKER_API_VERSION).la \
+	$(GIO_LIBS) \
+	$(GLIB2_LIBS) \
+	$(DBUS_LIBS)
diff --git a/examples/class-signal/class-signal.c b/examples/class-signal/class-signal.c
new file mode 100644
index 0000000..530d6cc
--- /dev/null
+++ b/examples/class-signal/class-signal.c
@@ -0,0 +1,132 @@
+/*
+ * 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 <dbus/dbus-glib-bindings.h>
+#include <dbus/dbus-glib-lowlevel.h>
+
+#include <libtracker-sparql/tracker-sparql.h>
+
+#define TRACKER_TYPE_THREE_INT_ARRAY	\
+	dbus_g_type_get_collection ("GPtrArray", \
+	                            dbus_g_type_get_struct("GValueArray", \
+	                                                    G_TYPE_INT, \
+	                                                    G_TYPE_INT, \
+	                                                    G_TYPE_INT, \
+	                                                    G_TYPE_INVALID))
+
+#define TRACKER_SERVICE                 "org.freedesktop.Tracker1"
+#define TRACKER_RESOURCES_OBJECT        "/org/freedesktop/Tracker1/Resources"
+#define TRACKER_INTERFACE_RESOURCES     "org.freedesktop.Tracker1.Resources"
+
+#define DBUS_MATCH_STR	"type='signal', " \
+	"sender='" TRACKER_SERVICE "', " \
+	"path='" TRACKER_RESOURCES_OBJECT "', " \
+	"interface='" TRACKER_INTERFACE_RESOURCES "'"
+
+static TrackerSparqlConnection *con;
+
+static void
+handle_statement (gint subject, gint predicate)
+{
+	gchar *query, *pred;
+	TrackerSparqlCursor *cursor;
+
+	query = g_strdup_printf ("SELECT tracker:subject (%d) tracker:subject(%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 (DBusMessage *message)
+{
+	DBusMessageIter iter, arr;
+	gchar *class_name;
+	gint arg_type, i;
+
+	dbus_message_iter_init (message, &iter);
+	dbus_message_iter_get_basic (&iter, &class_name);
+	g_print ("%s:\n", class_name);
+
+	for (i = 0; i < 2; i++) {
+		dbus_message_iter_next (&iter);
+		dbus_message_iter_recurse (&iter, &arr);
+
+		while ((arg_type = dbus_message_iter_get_arg_type (&arr)) != DBUS_TYPE_INVALID) {
+			DBusMessageIter strct;
+			gint subject = 0, predicate = 0, object = 0;
+
+			dbus_message_iter_recurse (&arr, &strct);
+			dbus_message_iter_get_basic (&strct, &subject);
+			dbus_message_iter_next (&strct);
+			dbus_message_iter_get_basic (&strct, &predicate);
+			dbus_message_iter_next (&strct);
+			dbus_message_iter_get_basic (&strct, &object);
+			handle_statement (subject, predicate);
+			dbus_message_iter_next (&arr);
+		}
+	}
+}
+
+static DBusHandlerResult
+message_filter (DBusConnection *connection, DBusMessage *message, gpointer ud)
+{
+	if (dbus_message_is_signal (message, TRACKER_INTERFACE_RESOURCES, "ClassSignal")) {
+		class_signal_cb (message);
+		return DBUS_HANDLER_RESULT_HANDLED;
+	}
+	return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+}
+
+
+gint
+main (gint argc, gchar *argv[])
+{
+	GMainLoop *loop;
+	GError *error = NULL;
+	DBusConnection *connection;
+
+	g_type_init ();
+	loop = g_main_loop_new (NULL, FALSE);
+	con = tracker_sparql_connection_get (&error);
+	connection = dbus_bus_get_private (DBUS_BUS_SESSION, NULL);
+	dbus_bus_request_name (connection, TRACKER_SERVICE, 0, NULL);
+	dbus_connection_add_filter (connection, message_filter, NULL, NULL);
+	dbus_bus_add_match (connection, DBUS_MATCH_STR, NULL);
+	dbus_connection_setup_with_g_main (connection, NULL);
+	g_main_loop_run (loop);
+	g_main_loop_unref (loop);
+	g_object_unref (con);
+	dbus_connection_unref (connection);
+
+	return 0;
+}