[gnome-photos/wip/rishi/manager-model: 3/8] base-manager: Add photos_base_manager_get_{next, previous}_object

[Debarshi Ray <debarshir src gnome org>]

commit a9eba16052b9d6fa5005b7c012ad01d84604f421
Author: Debarshi Ray <debarshir gnome org>
Date:   Tue Dec 6 10:28:43 2016 +0100

    base-manager: Add photos_base_manager_get_{next, previous}_object

 src/photos-base-manager.c |   74 +++++++++++++++++++++++++++++++++++++++++++++
 src/photos-base-manager.h |    6 ++++
 2 files changed, 80 insertions(+), 0 deletions(-)
---
diff --git a/src/photos-base-manager.c b/src/photos-base-manager.c
index e482cef..19db262 100644
--- a/src/photos-base-manager.c
+++ b/src/photos-base-manager.c
@@ -174,6 +174,32 @@ photos_base_manager_default_get_filter (PhotosBaseManager *self, gint flags)
 
 
 static GObject *
+photos_base_manager_default_get_next_object (PhotosBaseManager *self, GObject *object)
+{
+  PhotosBaseManagerPrivate *priv;
+  GObject *ret_val = NULL;
+  GSequenceIter *iter;
+  PhotosBaseManagerObjectData *object_data;
+  const gchar *id;
+
+  priv = photos_base_manager_get_instance_private (self);
+
+  id = photos_filterable_get_id (PHOTOS_FILTERABLE (object));
+  object_data = g_hash_table_lookup (priv->objects, id);
+  g_return_val_if_fail (object_data != NULL, NULL);
+
+  iter = g_sequence_iter_next (object_data->iter);
+  if (g_sequence_iter_is_end (iter))
+    goto out;
+
+  ret_val = G_OBJECT (g_sequence_get (iter));
+
+ out:
+  return ret_val;
+}
+
+
+static GObject *
 photos_base_manager_default_get_object_by_id (PhotosBaseManager *self, const gchar *id)
 {
   PhotosBaseManagerPrivate *priv;
@@ -193,6 +219,32 @@ photos_base_manager_default_get_object_by_id (PhotosBaseManager *self, const gch
 }
 
 
+static GObject *
+photos_base_manager_default_get_previous_object (PhotosBaseManager *self, GObject *object)
+{
+  PhotosBaseManagerPrivate *priv;
+  GObject *ret_val = NULL;
+  GSequenceIter *iter;
+  PhotosBaseManagerObjectData *object_data;
+  const gchar *id;
+
+  priv = photos_base_manager_get_instance_private (self);
+
+  id = photos_filterable_get_id (PHOTOS_FILTERABLE (object));
+  object_data = g_hash_table_lookup (priv->objects, id);
+  g_return_val_if_fail (object_data != NULL, NULL);
+
+  iter = g_sequence_iter_prev (object_data->iter);
+  if (g_sequence_iter_compare (iter, object_data->iter) == 0)
+    goto out;
+
+  ret_val = G_OBJECT (g_sequence_get (iter));
+
+ out:
+  return ret_val;
+}
+
+
 static gchar *
 photos_base_manager_default_get_where (PhotosBaseManager *self, gint flags)
 {
@@ -391,7 +443,9 @@ photos_base_manager_class_init (PhotosBaseManagerClass *class)
   class->add_object = photos_base_manager_default_add_object;
   class->get_active_object = photos_base_manager_default_get_active_object;
   class->get_filter = photos_base_manager_default_get_filter;
+  class->get_next_object = photos_base_manager_default_get_next_object;
   class->get_object_by_id = photos_base_manager_default_get_object_by_id;
+  class->get_previous_object = photos_base_manager_default_get_previous_object;
   class->get_where = photos_base_manager_default_get_where;
   class->remove_object_by_id = photos_base_manager_default_remove_object_by_id;
   class->set_active_object = photos_base_manager_default_set_active_object;
@@ -607,6 +661,16 @@ photos_base_manager_get_filter (PhotosBaseManager *self, gint flags)
 
 
 GObject *
+photos_base_manager_get_next_object (PhotosBaseManager *self, GObject *object)
+{
+  g_return_val_if_fail (PHOTOS_IS_BASE_MANAGER (self), NULL);
+  g_return_val_if_fail (PHOTOS_IS_FILTERABLE (object), NULL);
+
+  return PHOTOS_BASE_MANAGER_GET_CLASS (self)->get_next_object (self, object);
+}
+
+
+GObject *
 photos_base_manager_get_object_by_id (PhotosBaseManager *self, const gchar *id)
 {
   g_return_val_if_fail (PHOTOS_IS_BASE_MANAGER (self), NULL);
@@ -630,6 +694,16 @@ photos_base_manager_get_objects_count (PhotosBaseManager *self)
 }
 
 
+GObject *
+photos_base_manager_get_previous_object (PhotosBaseManager *self, GObject *object)
+{
+  g_return_val_if_fail (PHOTOS_IS_BASE_MANAGER (self), NULL);
+  g_return_val_if_fail (PHOTOS_IS_FILTERABLE (object), NULL);
+
+  return PHOTOS_BASE_MANAGER_GET_CLASS (self)->get_previous_object (self, object);
+}
+
+
 const gchar *
 photos_base_manager_get_title (PhotosBaseManager *self)
 {
diff --git a/src/photos-base-manager.h b/src/photos-base-manager.h
index 3d90472..c442f68 100644
--- a/src/photos-base-manager.h
+++ b/src/photos-base-manager.h
@@ -42,7 +42,9 @@ struct _PhotosBaseManagerClass
   void           (*add_object)             (PhotosBaseManager *self, GObject *object);
   GObject       *(*get_active_object)      (PhotosBaseManager *self);
   gchar         *(*get_filter)             (PhotosBaseManager *self, gint flags);
+  GObject       *(*get_next_object)        (PhotosBaseManager *self, GObject *object);
   GObject       *(*get_object_by_id)       (PhotosBaseManager *self, const gchar *id);
+  GObject       *(*get_previous_object)    (PhotosBaseManager *self, GObject *object);
   gchar         *(*get_where)              (PhotosBaseManager *self, gint flags);
   void           (*remove_object_by_id)    (PhotosBaseManager *self, const gchar *id);
   gboolean       (*set_active_object)      (PhotosBaseManager *self, GObject *object);
@@ -68,10 +70,14 @@ gchar              *photos_base_manager_get_all_filter           (PhotosBaseMana
 
 gchar              *photos_base_manager_get_filter               (PhotosBaseManager *self, gint flags);
 
+GObject            *photos_base_manager_get_next_object          (PhotosBaseManager *self, GObject *object);
+
 GObject            *photos_base_manager_get_object_by_id         (PhotosBaseManager *self, const gchar *id);
 
 guint               photos_base_manager_get_objects_count        (PhotosBaseManager *self);
 
+GObject            *photos_base_manager_get_previous_object      (PhotosBaseManager *self, GObject *object);
+
 const gchar        *photos_base_manager_get_title                (PhotosBaseManager *self);
 
 gchar              *photos_base_manager_get_where                (PhotosBaseManager *self, gint flags);