[gom] gom: Add to/from bytes metadata properties

[Bastien Nocera <hadess src gnome org>]

commit 3506261a519a7519a55aae72625b04be559c32c1
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Apr 16 01:21:00 2014 +0200

    gom: Add to/from bytes metadata properties
    
    If a property is not a number or a string, we'll need help
    serialising and deserialising it to a GBytes which we would fit
    in a BLOB column.

 gom/gom-resource.c |   31 +++++++++++++++++++++++++++++++
 gom/gom-resource.h |   23 +++++++++++++++++------
 2 files changed, 48 insertions(+), 6 deletions(-)
---
diff --git a/gom/gom-resource.c b/gom/gom-resource.c
index 43affe3..b032a05 100644
--- a/gom/gom-resource.c
+++ b/gom/gom-resource.c
@@ -86,6 +86,25 @@ gom_resource_class_set_property_set_mapped (GomResourceClass *resource_class,
 }
 
 void
+gom_resource_class_set_property_transform (GomResourceClass         *resource_class,
+                                           const gchar              *property_name,
+                                           GomResourceToBytesFunc    to_bytes_func,
+                                           GomResourceFromBytesFunc  from_bytes_func)
+{
+   GParamSpec *pspec;
+
+   g_return_if_fail(GOM_IS_RESOURCE_CLASS(resource_class));
+   g_return_if_fail(to_bytes_func != NULL);
+   g_return_if_fail(from_bytes_func != NULL);
+
+   pspec = g_object_class_find_property(G_OBJECT_CLASS(resource_class), property_name);
+   g_assert(pspec);
+
+   g_param_spec_set_qdata(pspec, GOM_RESOURCE_TO_BYTES_FUNC, to_bytes_func);
+   g_param_spec_set_qdata(pspec, GOM_RESOURCE_FROM_BYTES_FUNC, from_bytes_func);
+}
+
+void
 gom_resource_class_set_table (GomResourceClass *resource_class,
                               const gchar      *table)
 {
@@ -852,3 +871,15 @@ gom_resource_not_mapped_quark (void)
 {
    return g_quark_from_static_string("gom_resource_not_mapped_quark");
 }
+
+GQuark
+gom_resource_to_bytes_func_quark (void)
+{
+   return g_quark_from_static_string("gom_resource_to_bytes_func_quark");
+}
+
+GQuark
+gom_resource_from_bytes_func_quark (void)
+{
+   return g_quark_from_static_string("gom_resource_from_bytes_func_quark");
+}
diff --git a/gom/gom-resource.h b/gom/gom-resource.h
index 320f1d5..77ab73c 100644
--- a/gom/gom-resource.h
+++ b/gom/gom-resource.h
@@ -35,6 +35,8 @@ G_BEGIN_DECLS
 #define GOM_RESOURCE_ERROR           (gom_resource_error_quark())
 #define GOM_RESOURCE_NEW_IN_VERSION  (gom_resource_new_in_version_quark())
 #define GOM_RESOURCE_NOT_MAPPED      (gom_resource_not_mapped_quark())
+#define GOM_RESOURCE_TO_BYTES_FUNC   (gom_resource_to_bytes_func_quark())
+#define GOM_RESOURCE_FROM_BYTES_FUNC (gom_resource_from_bytes_func_quark())
 
 typedef struct _GomResource        GomResource;
 typedef struct _GomResourceClass   GomResourceClass;
@@ -64,16 +66,23 @@ struct _GomResourceClass
    gchar table[64];
 };
 
+typedef GBytes * (*GomResourceToBytesFunc) (GValue *value);
+typedef void (*GomResourceFromBytesFunc) (GBytes *bytes, GValue *value);
+
 void              gom_resource_class_set_table       (GomResourceClass *resource_class,
                                                       const gchar      *table);
 void              gom_resource_class_set_primary_key (GomResourceClass *resource_class,
                                                       const gchar      *primary_key);
-void              gom_resource_class_set_property_new_in_version (GomResourceClass *resource_class,
-                                                                  const gchar      *property_name,
-                                                                  guint             version);
-void              gom_resource_class_set_property_set_mapped     (GomResourceClass *resource_class,
-                                                                  const gchar      *property_name,
-                                                                  gboolean          is_mapped);
+void              gom_resource_class_set_property_new_in_version (GomResourceClass         *resource_class,
+                                                                  const gchar              *property_name,
+                                                                  guint                     version);
+void              gom_resource_class_set_property_set_mapped     (GomResourceClass         *resource_class,
+                                                                  const gchar              *property_name,
+                                                                  gboolean                  is_mapped);
+void              gom_resource_class_set_property_transform      (GomResourceClass         *resource_class,
+                                                                  const gchar              *property_name,
+                                                                  GomResourceToBytesFunc    to_bytes_func,
+                                                                  GomResourceFromBytesFunc  from_bytes_func);
 
 void              gom_resource_delete_async          (GomResource          *resource,
                                                       GAsyncReadyCallback   callback,
@@ -86,6 +95,8 @@ gboolean          gom_resource_delete_sync           (GomResource          *reso
 GQuark            gom_resource_error_quark           (void) G_GNUC_CONST;
 GQuark            gom_resource_new_in_version_quark  (void) G_GNUC_CONST;
 GQuark            gom_resource_not_mapped_quark      (void) G_GNUC_CONST;
+GQuark            gom_resource_to_bytes_func_quark   (void) G_GNUC_CONST;
+GQuark            gom_resource_from_bytes_func_quark (void) G_GNUC_CONST;
 GType             gom_resource_get_type              (void) G_GNUC_CONST;
 void              gom_resource_save_async            (GomResource          *resource,
                                                       GAsyncReadyCallback   callback,