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
  26 #include "gioalias.h"
  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 {
  47   return NULL;
  48 }
  49
  50 static gboolean
  51 g_null_settings_backend_write (GSettingsBackend *backend,
  52                                const gchar      *key,
  53                                GVariant         *value,
  54                                gpointer          origin_tag)
  55 {
  56   return FALSE;
  57 }
  58
  59 static gboolean
  60 g_null_settings_backend_write_keys (GSettingsBackend *backend,
  61                                     GTree            *tree,
  62                                     gpointer          origin_tag)
  63 {
  64   return FALSE;
  65 }
  66
  67 static void
  68 g_null_settings_backend_reset (GSettingsBackend *backend,
  69                                const gchar      *key,
  70                                gpointer          origin_tag)
  71 {
  72 }
  73
  74 static void
  75 g_null_settings_backend_reset_path (GSettingsBackend *backend,
  76                                     const gchar      *path,
  77                                     gpointer          origin_tag)
  78 {
  79 }
  80
  81 static gboolean
  82 g_null_settings_backend_get_writable (GSettingsBackend *backend,
  83                                         const gchar      *name)
  84 {
  85   return FALSE;
  86 }
  87
  88 static void
  89 g_null_settings_backend_init (GNullSettingsBackend *memory)
  90 {
  91 }
  92
  93 static void
  94 g_null_settings_backend_class_init (GNullSettingsBackendClass *class)
  95 {
  96   GSettingsBackendClass *backend_class = G_SETTINGS_BACKEND_CLASS (class);
  97
  98   backend_class->read = g_null_settings_backend_read;
  99   backend_class->write = g_null_settings_backend_write;
 100   backend_class->write_keys = g_null_settings_backend_write_keys;
 101   backend_class->reset = g_null_settings_backend_reset;
 102   backend_class->reset_path = g_null_settings_backend_reset_path;
 103   backend_class->get_writable = g_null_settings_backend_get_writable;
 104 }
 105
 106 GSettingsBackend *
 107 g_null_settings_backend_new (void)
 108 {
 109   return g_object_new (G_TYPE_NULL_SETTINGS_BACKEND, NULL);
 110 }