[libgdata] documents: Handle final page pagination in GDataDocumentsService

[Philip Withnall <pwithnall src gnome org>]

commit f08951ebf95977ece665636a5cf423a7bc4252d2
Author: Philip Withnall <philip tecnocode co uk>
Date:   Fri Dec 12 23:20:50 2014 +0000

    documents: Handle final page pagination in GDataDocumentsService
    
    The Google Documents servers always return a next page URI in a
    GDataFeed unless on the final page of results, in which case no URI is
    returned. Pass that information through to the GDataQuery so that
    pagination works correctly for Google Documents.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=741345

 gdata/services/documents/gdata-documents-service.c |   60 +++++++++++++++++++-
 1 files changed, 59 insertions(+), 1 deletions(-)
---
diff --git a/gdata/services/documents/gdata-documents-service.c 
b/gdata/services/documents/gdata-documents-service.c
index b264654..d77d379 100644
--- a/gdata/services/documents/gdata-documents-service.c
+++ b/gdata/services/documents/gdata-documents-service.c
@@ -2,7 +2,7 @@
 /*
  * GData Client
  * Copyright (C) Thibault Saunier 2009 <saunierthibault gmail com>
- * Copyright (C) Philip Withnall 2010 <philip tecnocode co uk>
+ * Copyright (C) Philip Withnall 2010, 2014 <philip tecnocode co uk>
  *
  * GData Client is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -273,6 +273,16 @@ gdata_documents_service_error_quark (void)
 
 static void append_query_headers (GDataService *self, GDataAuthorizationDomain *domain, SoupMessage 
*message);
 static GList *get_authorization_domains (void);
+static GDataFeed *
+parse_feed (GDataService *self,
+            GDataAuthorizationDomain *domain,
+            GDataQuery *query,
+            GType entry_type,
+            SoupMessage *message,
+            GCancellable *cancellable,
+            GDataQueryProgressCallback progress_callback,
+            gpointer progress_user_data,
+            GError **error);
 
 static gchar *_build_v2_upload_uri (GDataDocumentsFolder *folder) G_GNUC_WARN_UNUSED_RESULT G_GNUC_MALLOC;
 static gchar *_get_upload_uri_for_query_and_folder (GDataDocumentsUploadQuery *query,
@@ -291,6 +301,7 @@ gdata_documents_service_class_init (GDataDocumentsServiceClass *klass)
 
        service_class->append_query_headers = append_query_headers;
        service_class->get_authorization_domains = get_authorization_domains;
+       service_class->parse_feed = parse_feed;
 
        service_class->api_version = "3";
 }
@@ -356,6 +367,53 @@ get_authorization_domains (void)
        return authorization_domains;
 }
 
+static GDataFeed *
+parse_feed (GDataService *self,
+            GDataAuthorizationDomain *domain,
+            GDataQuery *query,
+            GType entry_type,
+            SoupMessage *message,
+            GCancellable *cancellable,
+            GDataQueryProgressCallback progress_callback,
+            gpointer progress_user_data,
+            GError **error)
+{
+       GDataServiceClass *klass;  /* unowned */
+       GDataFeed *feed = NULL;  /* owned */
+
+       klass = GDATA_SERVICE_CLASS (gdata_documents_service_parent_class);
+
+       /* Parse the feed. */
+       feed = klass->parse_feed (self, domain, query, entry_type, message,
+                                 cancellable, progress_callback,
+                                 progress_user_data, error);
+
+       /* Update the query with the next and previous URIs from the feed. If
+        * they are not present, we are on the first or final page of the
+        * feed. (This behaviour is specific to Google Docs.) */
+       if (query != NULL && feed != NULL) {
+               GDataLink *_link;
+
+               _link = gdata_feed_look_up_link (feed, "http://www.iana.org/assignments/relation/next";);
+
+               if (_link != NULL) {
+                       _gdata_query_set_next_uri (query, gdata_link_get_uri (_link));
+               } else {
+                       _gdata_query_set_next_uri_end (query);
+               }
+
+               _link = gdata_feed_look_up_link (feed, "http://www.iana.org/assignments/relation/previous";);
+
+               if (_link != NULL) {
+                       _gdata_query_set_previous_uri (query, gdata_link_get_uri (_link));
+               } else {
+                       _gdata_query_set_previous_uri_end (query);
+               }
+       }
+
+       return feed;
+}
+
 /**
  * gdata_documents_service_new:
  * @authorizer: (allow-none): a #GDataAuthorizer to authorize the service's requests, or %NULL