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140 lines
4.3 KiB
C
140 lines
4.3 KiB
C
/*
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* Copyright © 2010 Codethink Limited
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the licence, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Author: Ryan Lortie <desrt@desrt.ca>
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*/
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#include "config.h"
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#include "gsettingsbackendinternal.h"
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#include "giomodule.h"
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#include "gsimplepermission.h"
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#define G_TYPE_NULL_SETTINGS_BACKEND (g_null_settings_backend_get_type ())
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#define G_NULL_SETTINGS_BACKEND(inst) (G_TYPE_CHECK_INSTANCE_CAST ((inst), \
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G_TYPE_NULL_SETTINGS_BACKEND, \
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GNullSettingsBackend))
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typedef GSettingsBackendClass GNullSettingsBackendClass;
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typedef GSettingsBackend GNullSettingsBackend;
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G_DEFINE_TYPE_WITH_CODE (GNullSettingsBackend,
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g_null_settings_backend,
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G_TYPE_SETTINGS_BACKEND,
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g_io_extension_point_implement (G_SETTINGS_BACKEND_EXTENSION_POINT_NAME,
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g_define_type_id, "null", 10))
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static GVariant *
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g_null_settings_backend_read (GSettingsBackend *backend,
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const gchar *key,
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const GVariantType *expected_type,
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gboolean default_value)
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{
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return NULL;
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}
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static gboolean
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g_null_settings_backend_write (GSettingsBackend *backend,
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const gchar *key,
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GVariant *value,
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gpointer origin_tag)
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{
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if (value)
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g_variant_unref (g_variant_ref_sink (value));
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return FALSE;
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}
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static gboolean
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g_null_settings_backend_write_one (gpointer key,
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gpointer value,
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gpointer data)
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{
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if (value)
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g_variant_unref (g_variant_ref_sink (value));
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return FALSE;
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}
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static gboolean
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g_null_settings_backend_write_tree (GSettingsBackend *backend,
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GTree *tree,
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gpointer origin_tag)
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{
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g_tree_foreach (tree, g_null_settings_backend_write_one, backend);
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return FALSE;
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}
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static void
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g_null_settings_backend_reset (GSettingsBackend *backend,
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const gchar *key,
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gpointer origin_tag)
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{
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}
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static gboolean
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g_null_settings_backend_get_writable (GSettingsBackend *backend,
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const gchar *name)
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{
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return FALSE;
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}
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static GPermission *
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g_null_settings_backend_get_permission (GSettingsBackend *backend,
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const gchar *path)
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{
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return g_simple_permission_new (FALSE);
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}
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static void
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g_null_settings_backend_init (GNullSettingsBackend *memory)
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{
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}
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static void
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g_null_settings_backend_class_init (GNullSettingsBackendClass *class)
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{
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GSettingsBackendClass *backend_class = G_SETTINGS_BACKEND_CLASS (class);
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backend_class->read = g_null_settings_backend_read;
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backend_class->write = g_null_settings_backend_write;
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backend_class->write_tree = g_null_settings_backend_write_tree;
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backend_class->reset = g_null_settings_backend_reset;
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backend_class->get_writable = g_null_settings_backend_get_writable;
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backend_class->get_permission = g_null_settings_backend_get_permission;
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}
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/**
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* g_null_settings_backend_new:
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*
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*
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* Creates a readonly #GSettingsBackend.
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*
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* This backend does not allow changes to settings, so all settings
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* will always have their default values.
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*
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* Returns: (transfer full): a newly created #GSettingsBackend
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*
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* Since: 2.28
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*/
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GSettingsBackend *
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g_null_settings_backend_new (void)
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{
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return g_object_new (G_TYPE_NULL_SETTINGS_BACKEND, NULL);
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}
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