[evolution-data-server] EDataFactory: Add 'backend_factory_type' class member.

[Matthew Barnes <mbarnes src gnome org>]

commit defd7692d83a1813d64205e32166ca9f253f6a7f
Author: Matthew Barnes <mbarnes redhat com>
Date:   Sun Apr 15 12:12:29 2012 -0400

    EDataFactory: Add 'backend_factory_type' class member.
    
    Subclasses may now specify exactly what type of backend factories to
    instantiate by setting the 'backend_factory_type' class member, which
    defaults to E_TYPE_BACKEND_FACTORY.
    
    Note that because sizeof(GType) and sizeof(gpointer) are not necessarily
    equal, the reserved pointer pool at the end of the class struct does not
    help us avoid an ABI break in this case.  But the libebackend's ABI has
    already been broken since 3.4.0.

 libebackend/e-data-factory.c |    6 +++++-
 libebackend/e-data-factory.h |    2 ++
 2 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/libebackend/e-data-factory.c b/libebackend/e-data-factory.c
index 8f27afd..0d5be47 100644
--- a/libebackend/e-data-factory.c
+++ b/libebackend/e-data-factory.c
@@ -99,9 +99,11 @@ data_factory_finalize (GObject *object)
 static void
 data_factory_constructed (GObject *object)
 {
+	EDataFactoryClass *class;
 	EDataFactoryPrivate *priv;
 	GList *list, *link;
 
+	class = E_DATA_FACTORY_GET_CLASS (object);
 	priv = E_DATA_FACTORY_GET_PRIVATE (object);
 
 	/* Chain up to parent's constructed() method. */
@@ -110,7 +112,7 @@ data_factory_constructed (GObject *object)
 	/* Collect all backend factories into a hash table. */
 
 	list = e_extensible_list_extensions (
-		E_EXTENSIBLE (object), E_TYPE_BACKEND_FACTORY);
+		E_EXTENSIBLE (object), class->backend_factory_type);
 
 	for (link = list; link != NULL; link = g_list_next (link)) {
 		EBackendFactory *backend_factory;
@@ -165,6 +167,8 @@ e_data_factory_class_init (EDataFactoryClass *class)
 
 	dbus_server_class = E_DBUS_SERVER_CLASS (class);
 	dbus_server_class->quit_server = data_factory_quit_server;
+
+	class->backend_factory_type = E_TYPE_BACKEND_FACTORY;
 }
 
 static void
diff --git a/libebackend/e-data-factory.h b/libebackend/e-data-factory.h
index 0ed5682..3788789 100644
--- a/libebackend/e-data-factory.h
+++ b/libebackend/e-data-factory.h
@@ -63,6 +63,8 @@ struct _EDataFactory {
 struct _EDataFactoryClass {
 	EDBusServerClass parent_class;
 
+	GType backend_factory_type;
+
 	gpointer reserved[16];
 };