[libgovirt] Add OvirtResource::to_xml() vfunc

[Christophe Fergeau <teuf src gnome org>]

commit a4f3d45b70145c65e4016dc82a3cc641c3c0f8a6
Author: Christophe Fergeau <cfergeau redhat com>
Date:   Thu Aug 29 20:52:30 2013 +0200

    Add OvirtResource::to_xml() vfunc
    
    This is used to serialize an OvirtResource to XML, which is needed
    when one wants to add/update a resource.

 govirt/ovirt-resource-private.h |    1 +
 govirt/ovirt-resource.c         |   14 ++++++++++++++
 govirt/ovirt-resource.h         |    3 ++-
 3 files changed, 17 insertions(+), 1 deletions(-)
---
diff --git a/govirt/ovirt-resource-private.h b/govirt/ovirt-resource-private.h
index baa1a8c..28bd251 100644
--- a/govirt/ovirt-resource-private.h
+++ b/govirt/ovirt-resource-private.h
@@ -28,6 +28,7 @@ G_BEGIN_DECLS
 
 const char *ovirt_resource_get_action(OvirtResource *resource,
                                       const char *action);
+char *ovirt_resource_to_xml(OvirtResource *resource);
 
 G_END_DECLS
 
diff --git a/govirt/ovirt-resource.c b/govirt/ovirt-resource.c
index 1b2e057..c127a7c 100644
--- a/govirt/ovirt-resource.c
+++ b/govirt/ovirt-resource.c
@@ -456,3 +456,17 @@ static gboolean ovirt_resource_init_from_xml(OvirtResource *resource,
 
     return klass->init_from_xml(resource, node, error);
 }
+
+
+char *ovirt_resource_to_xml(OvirtResource *resource)
+{
+    OvirtResourceClass *klass;
+
+    g_return_val_if_fail(OVIRT_IS_RESOURCE(resource), NULL);
+
+    klass = OVIRT_RESOURCE_GET_CLASS(resource);
+    if (klass->to_xml == NULL)
+        return NULL;
+
+    return klass->to_xml(resource);
+}
diff --git a/govirt/ovirt-resource.h b/govirt/ovirt-resource.h
index 8288bd3..d48d8a9 100644
--- a/govirt/ovirt-resource.h
+++ b/govirt/ovirt-resource.h
@@ -56,8 +56,9 @@ struct _OvirtResourceClass
     gboolean (*init_from_xml)(OvirtResource *resource,
                               RestXmlNode *node,
                               GError **error);
+    char *(*to_xml)(OvirtResource *resource);
 
-    gpointer padding[20];
+    gpointer padding[19];
 };
 
 GType ovirt_resource_get_type(void);