[evolution-data-server] [Google book] Implement EBookBackend::refresh and advertise its support

[Milan Crha <mcrha src gnome org>]

commit 6eef5e642578465db99d7fa6c200f51a154c4ece
Author: Milan Crha <mcrha redhat com>
Date:   Tue Jul 30 11:35:21 2013 +0200

    [Google book] Implement EBookBackend::refresh and advertise its support

 .../backends/google/e-book-backend-google.c        |   18 +++++++++++++++++-
 1 files changed, 17 insertions(+), 1 deletions(-)
---
diff --git a/addressbook/backends/google/e-book-backend-google.c 
b/addressbook/backends/google/e-book-backend-google.c
index c124ca8..456b18c 100644
--- a/addressbook/backends/google/e-book-backend-google.c
+++ b/addressbook/backends/google/e-book-backend-google.c
@@ -1438,7 +1438,7 @@ book_backend_google_get_backend_property (EBookBackend *backend,
        g_return_val_if_fail (prop_name != NULL, NULL);
 
        if (g_str_equal (prop_name, CLIENT_BACKEND_PROPERTY_CAPABILITIES)) {
-               return g_strdup ("net,do-initial-query,contact-lists");
+               return g_strdup ("net,do-initial-query,contact-lists,refresh-supported");
 
        } else if (g_str_equal (prop_name, BOOK_BACKEND_PROPERTY_REQUIRED_FIELDS)) {
                return g_strdup ("");
@@ -2187,6 +2187,21 @@ book_backend_google_stop_view (EBookBackend *backend,
        }
 }
 
+static void
+book_backend_google_refresh (EBookBackend *backend,
+                            EDataBook *book,
+                            guint32 opid,
+                            GCancellable *cancellable)
+{
+       g_return_if_fail (E_IS_BOOK_BACKEND_GOOGLE (backend));
+
+       /* stop immediately, nothing to report here */
+       e_data_book_respond_refresh (book, opid, NULL);
+
+       /* get only changes, it's not needed to redownload whole cache */
+       get_new_contacts (backend);
+}
+
 static ESourceAuthenticationResult
 book_backend_google_try_password_sync (ESourceAuthenticator *authenticator,
                                        const GString *password,
@@ -2266,6 +2281,7 @@ e_book_backend_google_class_init (EBookBackendGoogleClass *class)
        backend_class->get_contact_list_sync = book_backend_google_get_contact_list_sync;
        backend_class->start_view = book_backend_google_start_view;
        backend_class->stop_view = book_backend_google_stop_view;
+       backend_class->refresh = book_backend_google_refresh;
 }
 
 static void