serializable: Add methods proxying default implementations

If you want to use the default implementation of serialize_property()
and/or deserialize_property() from an object class implementing
JsonSerializable you currently have to peek the interface vtable and
then call the vfunc pointers.

We can expose the default implementation through functions ourselves and
simplify the required code.

1 files changed, 92 insertions, 0 deletions

diff --git a/json-glib/json-serializable.c b/json-glib/json-serializable.c
index 1f596e1..43ada37 100644
--- a/json-glib/json-serializable.c
+++ b/json-glib/json-serializable.c
@@ -155,3 +155,95 @@ json_serializable_get_type (void)
 
   return iface_type;
 }
+
+/**
+ * json_serializable_default_serialize_property:
+ * @serializable: a #JsonSerializable object
+ * @property_name: the name of the property
+ * @value: the value of the property
+ * @pspec: a #GParamSpec
+ *
+ * Calls the default implementation of the #JsonSerializable
+ * serialize_property() virtual function
+ *
+ * This function can be used inside a custom implementation
+ * of the serialize_property() virtual function in lieu of:
+ *
+ * |[
+ *   JsonSerializable *iface;
+ *   JsonNode *node;
+ *
+ *   iface = g_type_default_interface_peek (JSON_TYPE_SERIALIZABLE);
+ *   node = iface->serialize_property (serializable, property_name,
+ *                                     value,
+ *                                     pspec);
+ * ]|
+ *
+ * Return value: (transfer full): a #JsonNode containing the serialized
+ *   property
+ *
+ * Since: 0.10
+ */
+JsonNode *
+json_serializable_default_serialize_property (JsonSerializable *serializable,
+                                              const gchar      *property_name,
+                                              const GValue     *value,
+                                              GParamSpec       *pspec)
+{
+  g_return_val_if_fail (JSON_IS_SERIALIZABLE (serializable), NULL);
+  g_return_val_if_fail (property_name != NULL, NULL);
+  g_return_val_if_fail (value != NULL, NULL);
+  g_return_val_if_fail (pspec != NULL, NULL);
+
+  return json_serializable_real_serialize (serializable,
+                                           property_name,
+                                           value, pspec);
+}
+
+/**
+ * json_serializable_default_deserialize_property:
+ * @serializable: a #JsonSerializable
+ * @property_name: the name of the property
+ * @value: a pointer to an uninitialized #GValue
+ * @pspec: a #GParamSpec
+ * @property_node: a #JsonNode containing the serialized property
+ *
+ * Calls the default implementation of the #JsonSerializable
+ * deserialize_property() virtual function
+ *
+ * This function can be used inside a custom implementation
+ * of the deserialize_property() virtual function in lieu of:
+ *
+ * |[
+ *   JsonSerializable *iface;
+ *   gboolean res;
+ *
+ *   iface = g_type_default_interface_peek (JSON_TYPE_SERIALIZABLE);
+ *   res = iface->deserialize_property (serializable, property_name,
+ *                                      value,
+ *                                      pspec,
+ *                                      property_node);
+ * ]|
+ *
+ * Return value: %TRUE if the property was successfully deserialized.
+ *
+ * Since: 0.10
+ */
+gboolean
+json_serializable_default_deserialize_property (JsonSerializable *serializable,
+                                                const gchar      *property_name,
+                                                GValue           *value,
+                                                GParamSpec       *pspec,
+                                                JsonNode         *property_node)
+{
+  g_return_val_if_fail (JSON_IS_SERIALIZABLE (serializable), FALSE);
+  g_return_val_if_fail (property_name != NULL, FALSE);
+  g_return_val_if_fail (value != NULL, FALSE);
+  g_return_val_if_fail (pspec != NULL, FALSE);
+  g_return_val_if_fail (property_node != NULL, FALSE);
+
+  return json_serializable_real_deserialize (serializable,
+                                             property_name,
+                                             value, pspec,
+                                             property_node);
+}