gio/gsettingsbackend.h

   1 /*
   2  * Copyright © 2009, 2010 Codethink Limited
   3  * Copyright © 2010 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the licence, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Authors: Ryan Lortie <desrt@desrt.ca>
  21  *          Matthias Clasen <mclasen@redhat.com>
  22  */
  23
  24 #ifndef __G_SETTINGS_BACKEND_H__
  25 #define __G_SETTINGS_BACKEND_H__
  26
  27 #if !defined (G_SETTINGS_ENABLE_BACKEND) && !defined (GIO_COMPILATION)
  28 #error "You must define G_SETTINGS_ENABLE_BACKEND before including <gio/gsettingsbackend.h>."
  29 #endif
  30
  31 #define __GIO_GIO_H_INSIDE__
  32 #include <gio/giotypes.h>
  33 #undef __GIO_GIO_H_INSIDE__
  34
  35 G_BEGIN_DECLS
  36
  37 #define G_TYPE_SETTINGS_BACKEND                             (g_settings_backend_get_type ())
  38 #define G_SETTINGS_BACKEND(inst)                            (G_TYPE_CHECK_INSTANCE_CAST ((inst),                     \
  39                                                              G_TYPE_SETTINGS_BACKEND, GSettingsBackend))
  40 #define G_SETTINGS_BACKEND_CLASS(class)                     (G_TYPE_CHECK_CLASS_CAST ((class),                       \
  41                                                              G_TYPE_SETTINGS_BACKEND, GSettingsBackendClass))
  42 #define G_IS_SETTINGS_BACKEND(inst)                         (G_TYPE_CHECK_INSTANCE_TYPE ((inst),                     \
  43                                                              G_TYPE_SETTINGS_BACKEND))
  44 #define G_IS_SETTINGS_BACKEND_CLASS(class)                  (G_TYPE_CHECK_CLASS_TYPE ((class),                       \
  45                                                              G_TYPE_SETTINGS_BACKEND))
  46 #define G_SETTINGS_BACKEND_GET_CLASS(inst)                  (G_TYPE_INSTANCE_GET_CLASS ((inst),                      \
  47                                                              G_TYPE_SETTINGS_BACKEND, GSettingsBackendClass))
  48
  49 /**
  50  * G_SETTINGS_BACKEND_EXTENSION_POINT_NAME:
  51  *
  52  * Extension point for #GSettingsBackend functionality.
  53  **/
  54 #define G_SETTINGS_BACKEND_EXTENSION_POINT_NAME "gsettings-backend"
  55
  56 /**
  57  * GSettingsBackend:
  58  *
  59  * An implementation of a settings storage repository.
  60  **/
  61 typedef struct _GSettingsBackendPrivate                     GSettingsBackendPrivate;
  62 typedef struct _GSettingsBackendClass                       GSettingsBackendClass;
  63
  64 struct _GSettingsBackendClass
  65 {
  66   GObjectClass parent_class;
  67
  68   GVariant *    (*read)             (GSettingsBackend    *backend,
  69                                      const gchar         *key,
  70                                      const GVariantType  *expected_type,
  71                                      gboolean             default_value);
  72
  73   gboolean      (*get_writable)     (GSettingsBackend    *backend,
  74                                      const gchar         *key);
  75
  76   gboolean      (*write)            (GSettingsBackend    *backend,
  77                                      const gchar         *key,
  78                                      GVariant            *value,
  79                                      gpointer             origin_tag);
  80   gboolean      (*write_tree)       (GSettingsBackend    *backend,
  81                                      GTree               *tree,
  82                                      gpointer             origin_tag);
  83   void          (*reset)            (GSettingsBackend    *backend,
  84                                      const gchar         *key,
  85                                      gpointer             origin_tag);
  86
  87   void          (*subscribe)        (GSettingsBackend    *backend,
  88                                      const gchar         *name);
  89   void          (*unsubscribe)      (GSettingsBackend    *backend,
  90                                      const gchar         *name);
  91   void          (*sync)             (GSettingsBackend    *backend);
  92
  93   GPermission * (*get_permission)   (GSettingsBackend    *backend,
  94                                      const gchar         *path);
  95
  96   gpointer padding[24];
  97 };
  98
  99 struct _GSettingsBackend
 100 {
 101   GObject parent_instance;
 102
 103   /*< private >*/
 104   GSettingsBackendPrivate *priv;
 105 };
 106
 107 GType                   g_settings_backend_get_type                     (void);
 108
 109 void                    g_settings_backend_changed                      (GSettingsBackend    *backend,
 110                                                                          const gchar         *key,
 111                                                                          gpointer             origin_tag);
 112 void                    g_settings_backend_path_changed                 (GSettingsBackend    *backend,
 113                                                                          const gchar         *path,
 114                                                                          gpointer             origin_tag);
 115 void                    g_settings_backend_flatten_tree                 (GTree               *tree,
 116                                                                          gchar              **path,
 117                                                                          const gchar       ***keys,
 118                                                                          GVariant          ***values);
 119 void                    g_settings_backend_keys_changed                 (GSettingsBackend    *backend,
 120                                                                          const gchar         *path,
 121                                                                          gchar const * const *items,
 122                                                                          gpointer             origin_tag);
 123
 124 void                    g_settings_backend_path_writable_changed        (GSettingsBackend    *backend,
 125                                                                          const gchar         *path);
 126 void                    g_settings_backend_writable_changed             (GSettingsBackend    *backend,
 127                                                                          const gchar         *key);
 128 void                    g_settings_backend_changed_tree                 (GSettingsBackend    *backend,
 129                                                                          GTree               *tree,
 130                                                                          gpointer             origin_tag);
 131
 132 GSettingsBackend *      g_settings_backend_get_default                  (void);
 133
 134 GSettingsBackend *      g_keyfile_settings_backend_new                  (const gchar         *filename,
 135                                                                          const gchar         *root_path,
 136                                                                          const gchar         *root_group);
 137
 138 GSettingsBackend *      g_null_settings_backend_new                     (void);
 139
 140 GSettingsBackend *      g_memory_settings_backend_new                   (void);
 141
 142 G_END_DECLS
 143
 144 #endif /* __G_SETTINGS_BACKEND_H__ */