2 * Copyright © 2010 Codethink Limited
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 2.1 of the License, or (at your option) any later version.
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.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
17 * Author: Ryan Lortie <desrt@desrt.ca>
22 #include "gsettingsbackendinternal.h"
23 #include "giomodule.h"
24 #include "gsimplepermission.h"
27 #define G_TYPE_NULL_SETTINGS_BACKEND (g_null_settings_backend_get_type ())
28 #define G_NULL_SETTINGS_BACKEND(inst) (G_TYPE_CHECK_INSTANCE_CAST ((inst), \
29 G_TYPE_NULL_SETTINGS_BACKEND, \
30 GNullSettingsBackend))
33 typedef GSettingsBackendClass GNullSettingsBackendClass
;
34 typedef GSettingsBackend GNullSettingsBackend
;
36 G_DEFINE_TYPE_WITH_CODE (GNullSettingsBackend
,
37 g_null_settings_backend
,
38 G_TYPE_SETTINGS_BACKEND
,
39 g_io_extension_point_implement (G_SETTINGS_BACKEND_EXTENSION_POINT_NAME
,
40 g_define_type_id
, "null", 10))
43 g_null_settings_backend_read (GSettingsBackend
*backend
,
45 const GVariantType
*expected_type
,
46 gboolean default_value
)
52 g_null_settings_backend_write (GSettingsBackend
*backend
,
58 g_variant_unref (g_variant_ref_sink (value
));
63 g_null_settings_backend_write_one (gpointer key
,
68 g_variant_unref (g_variant_ref_sink (value
));
73 g_null_settings_backend_write_tree (GSettingsBackend
*backend
,
77 g_tree_foreach (tree
, g_null_settings_backend_write_one
, backend
);
82 g_null_settings_backend_reset (GSettingsBackend
*backend
,
89 g_null_settings_backend_get_writable (GSettingsBackend
*backend
,
96 g_null_settings_backend_get_permission (GSettingsBackend
*backend
,
99 return g_simple_permission_new (FALSE
);
103 g_null_settings_backend_init (GNullSettingsBackend
*memory
)
108 g_null_settings_backend_class_init (GNullSettingsBackendClass
*class)
110 GSettingsBackendClass
*backend_class
= G_SETTINGS_BACKEND_CLASS (class);
112 backend_class
->read
= g_null_settings_backend_read
;
113 backend_class
->write
= g_null_settings_backend_write
;
114 backend_class
->write_tree
= g_null_settings_backend_write_tree
;
115 backend_class
->reset
= g_null_settings_backend_reset
;
116 backend_class
->get_writable
= g_null_settings_backend_get_writable
;
117 backend_class
->get_permission
= g_null_settings_backend_get_permission
;
121 * g_null_settings_backend_new:
124 * Creates a readonly #GSettingsBackend.
126 * This backend does not allow changes to settings, so all settings
127 * will always have their default values.
129 * Returns: (transfer full): a newly created #GSettingsBackend
134 g_null_settings_backend_new (void)
136 return g_object_new (G_TYPE_NULL_SETTINGS_BACKEND
, NULL
);