[evolution-ews] ews-backend: Implement dup_resource_id() method.

[Matthew Barnes <mbarnes src gnome org>]

commit bb7adacb28dcccc6e73d6e6fc3ac9a7f3265e6d4
Author: Matthew Barnes <mbarnes redhat com>
Date:   Tue Jun 12 21:22:31 2012 -0400

    ews-backend: Implement dup_resource_id() method.

 src/modules/module-ews-backend.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)
---
diff --git a/src/modules/module-ews-backend.c b/src/modules/module-ews-backend.c
index 7d4cce7..1cd3e81 100644
--- a/src/modules/module-ews-backend.c
+++ b/src/modules/module-ews-backend.c
@@ -523,6 +523,19 @@ ews_backend_populate (ECollectionBackend *backend)
 		G_CALLBACK (ews_backend_source_changed_cb), backend);
 }
 
+static gchar *
+ews_backend_dup_resource_id (ECollectionBackend *backend,
+                             ESource *child_source)
+{
+	ESourceEwsFolder *extension;
+	const gchar *extension_name;
+
+	extension_name = E_SOURCE_EXTENSION_EWS_FOLDER;
+	extension = e_source_get_extension (child_source, extension_name);
+
+	return e_source_ews_folder_dup_id (extension);
+}
+
 static void
 ews_backend_child_added (ECollectionBackend *backend,
                          ESource *child_source)
@@ -743,6 +756,7 @@ e_ews_backend_class_init (EEwsBackendClass *class)
 
 	backend_class = E_COLLECTION_BACKEND_CLASS (class);
 	backend_class->populate = ews_backend_populate;
+	backend_class->dup_resource_id = ews_backend_dup_resource_id;
 	backend_class->child_added = ews_backend_child_added;
 	backend_class->child_removed = ews_backend_child_removed;