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 #include "gioalias.h"
  28
  29 #define G_TYPE_NULL_SETTINGS_BACKEND    (g_null_settings_backend_get_type ())
  30 #define G_NULL_SETTINGS_BACKEND(inst)   (G_TYPE_CHECK_INSTANCE_CAST ((inst), \
  31                                          G_TYPE_NULL_SETTINGS_BACKEND,       \
  32                                          GNullSettingsBackend))
  33
  34
  35 typedef GSettingsBackendClass GNullSettingsBackendClass;
  36 typedef GSettingsBackend      GNullSettingsBackend;
  37
  38 static GType g_null_settings_backend_get_type (void);
  39 G_DEFINE_TYPE (GNullSettingsBackend,
  40                g_null_settings_backend,
  41                G_TYPE_SETTINGS_BACKEND)
  42
  43 static GVariant *
  44 g_null_settings_backend_read (GSettingsBackend   *backend,
  45                               const gchar        *key,
  46                               const GVariantType *expected_type,
  47                               gboolean            default_value)
  48 {
  49   return NULL;
  50 }
  51
  52 static gboolean
  53 g_null_settings_backend_write (GSettingsBackend *backend,
  54                                const gchar      *key,
  55                                GVariant         *value,
  56                                gpointer          origin_tag)
  57 {
  58   return FALSE;
  59 }
  60
  61 static gboolean
  62 g_null_settings_backend_write_keys (GSettingsBackend *backend,
  63                                     GTree            *tree,
  64                                     gpointer          origin_tag)
  65 {
  66   return FALSE;
  67 }
  68
  69 static void
  70 g_null_settings_backend_reset (GSettingsBackend *backend,
  71                                const gchar      *key,
  72                                gpointer          origin_tag)
  73 {
  74 }
  75
  76 static void
  77 g_null_settings_backend_reset_path (GSettingsBackend *backend,
  78                                     const gchar      *path,
  79                                     gpointer          origin_tag)
  80 {
  81 }
  82
  83 static gboolean
  84 g_null_settings_backend_get_writable (GSettingsBackend *backend,
  85                                       const gchar      *name)
  86 {
  87   return FALSE;
  88 }
  89
  90 static GPermission *
  91 g_null_settings_backend_get_permission (GSettingsBackend *backend,
  92                                         const gchar      *path)
  93 {
  94   return g_simple_permission_new (FALSE);
  95 }
  96
  97 static void
  98 g_null_settings_backend_init (GNullSettingsBackend *memory)
  99 {
 100 }
 101
 102 static void
 103 g_null_settings_backend_class_init (GNullSettingsBackendClass *class)
 104 {
 105   GSettingsBackendClass *backend_class = G_SETTINGS_BACKEND_CLASS (class);
 106
 107   backend_class->read = g_null_settings_backend_read;
 108   backend_class->write = g_null_settings_backend_write;
 109   backend_class->write_keys = g_null_settings_backend_write_keys;
 110   backend_class->reset = g_null_settings_backend_reset;
 111   backend_class->reset_path = g_null_settings_backend_reset_path;
 112   backend_class->get_writable = g_null_settings_backend_get_writable;
 113   backend_class->get_permission = g_null_settings_backend_get_permission;
 114 }
 115
 116 GSettingsBackend *
 117 g_null_settings_backend_new (void)
 118 {
 119   return g_object_new (G_TYPE_NULL_SETTINGS_BACKEND, NULL);
 120 }