gio/gnullsettingsbackend.c

   1 /*
   2  * Copyright © 2010 Codethink Limited
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the licence, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  *
  19  * Author: Ryan Lortie <desrt@desrt.ca>
  20  */
  21
  22 #include "config.h"
  23
  24 #include "gnullsettingsbackend.h"
  25 #include "gsimplepermission.h"
  26
  27
  28 #define G_TYPE_NULL_SETTINGS_BACKEND    (g_null_settings_backend_get_type ())
  29 #define G_NULL_SETTINGS_BACKEND(inst)   (G_TYPE_CHECK_INSTANCE_CAST ((inst), \
  30                                          G_TYPE_NULL_SETTINGS_BACKEND,       \
  31                                          GNullSettingsBackend))
  32
  33
  34 typedef GSettingsBackendClass GNullSettingsBackendClass;
  35 typedef GSettingsBackend      GNullSettingsBackend;
  36
  37 static GType g_null_settings_backend_get_type (void);
  38 G_DEFINE_TYPE (GNullSettingsBackend,
  39                g_null_settings_backend,
  40                G_TYPE_SETTINGS_BACKEND)
  41
  42 static GVariant *
  43 g_null_settings_backend_read (GSettingsBackend   *backend,
  44                               const gchar        *key,
  45                               const GVariantType *expected_type,
  46                               gboolean            default_value)
  47 {
  48   return NULL;
  49 }
  50
  51 static gboolean
  52 g_null_settings_backend_write (GSettingsBackend *backend,
  53                                const gchar      *key,
  54                                GVariant         *value,
  55                                gpointer          origin_tag)
  56 {
  57   return FALSE;
  58 }
  59
  60 static gboolean
  61 g_null_settings_backend_write_tree (GSettingsBackend *backend,
  62                                     GTree            *tree,
  63                                     gpointer          origin_tag)
  64 {
  65   return FALSE;
  66 }
  67
  68 static void
  69 g_null_settings_backend_reset (GSettingsBackend *backend,
  70                                const gchar      *key,
  71                                gpointer          origin_tag)
  72 {
  73 }
  74
  75 static gboolean
  76 g_null_settings_backend_get_writable (GSettingsBackend *backend,
  77                                       const gchar      *name)
  78 {
  79   return FALSE;
  80 }
  81
  82 static GPermission *
  83 g_null_settings_backend_get_permission (GSettingsBackend *backend,
  84                                         const gchar      *path)
  85 {
  86   return g_simple_permission_new (FALSE);
  87 }
  88
  89 static void
  90 g_null_settings_backend_init (GNullSettingsBackend *memory)
  91 {
  92 }
  93
  94 static void
  95 g_null_settings_backend_class_init (GNullSettingsBackendClass *class)
  96 {
  97   GSettingsBackendClass *backend_class = G_SETTINGS_BACKEND_CLASS (class);
  98
  99   backend_class->read = g_null_settings_backend_read;
 100   backend_class->write = g_null_settings_backend_write;
 101   backend_class->write_tree = g_null_settings_backend_write_tree;
 102   backend_class->reset = g_null_settings_backend_reset;
 103   backend_class->get_writable = g_null_settings_backend_get_writable;
 104   backend_class->get_permission = g_null_settings_backend_get_permission;
 105 }
 106
 107 GSettingsBackend *
 108 g_null_settings_backend_new (void)
 109 {
 110   return g_object_new (G_TYPE_NULL_SETTINGS_BACKEND, NULL);
 111 }