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/*
* Copyright © 2010 Codethink Limited
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Author: Ryan Lortie <desrt@desrt.ca>
*/
#include "config.h"
#include "gsimplepermission.h"
#include "gsettingsbackendinternal.h"
#include "giomodule-priv.h"
#define G_TYPE_MEMORY_SETTINGS_BACKEND (g_memory_settings_backend_get_type())
#define G_MEMORY_SETTINGS_BACKEND(inst) (G_TYPE_CHECK_INSTANCE_CAST ((inst), \
G_TYPE_MEMORY_SETTINGS_BACKEND, \
GMemorySettingsBackend))
typedef GSettingsBackendClass GMemorySettingsBackendClass;
typedef struct
{
GSettingsBackend parent_instance;
GHashTable *table;
} GMemorySettingsBackend;
G_DEFINE_TYPE_WITH_CODE (GMemorySettingsBackend,
g_memory_settings_backend,
G_TYPE_SETTINGS_BACKEND,
_g_io_modules_ensure_extension_points_registered ();
g_io_extension_point_implement (G_SETTINGS_BACKEND_EXTENSION_POINT_NAME,
g_define_type_id, "memory", 10))
static GVariant *
g_memory_settings_backend_read (GSettingsBackend *backend,
const gchar *key,
const GVariantType *expected_type,
gboolean default_value)
{
GMemorySettingsBackend *memory = G_MEMORY_SETTINGS_BACKEND (backend);
GVariant *value;
if (default_value)
return NULL;
value = g_hash_table_lookup (memory->table, key);
if (value != NULL)
g_variant_ref (value);
return value;
}
static gboolean
g_memory_settings_backend_write (GSettingsBackend *backend,
const gchar *key,
GVariant *value,
gpointer origin_tag)
{
GMemorySettingsBackend *memory = G_MEMORY_SETTINGS_BACKEND (backend);
GVariant *old_value;
old_value = g_hash_table_lookup (memory->table, key);
g_variant_ref_sink (value);
if (old_value == NULL || !g_variant_equal (value, old_value))
{
g_hash_table_insert (memory->table, g_strdup (key), value);
g_settings_backend_changed (backend, key, origin_tag);
}
else
g_variant_unref (value);
return TRUE;
}
static gboolean
g_memory_settings_backend_write_one (gpointer key,
gpointer value,
gpointer data)
{
GMemorySettingsBackend *memory = data;
if (value != NULL)
g_hash_table_insert (memory->table, g_strdup (key), g_variant_ref (value));
else
g_hash_table_remove (memory->table, key);
return FALSE;
}
static gboolean
g_memory_settings_backend_write_tree (GSettingsBackend *backend,
GTree *tree,
gpointer origin_tag)
{
g_tree_foreach (tree, g_memory_settings_backend_write_one, backend);
g_settings_backend_changed_tree (backend, tree, origin_tag);
return TRUE;
}
static void
g_memory_settings_backend_reset (GSettingsBackend *backend,
const gchar *key,
gpointer origin_tag)
{
GMemorySettingsBackend *memory = G_MEMORY_SETTINGS_BACKEND (backend);
if (g_hash_table_lookup (memory->table, key))
{
g_hash_table_remove (memory->table, key);
g_settings_backend_changed (backend, key, origin_tag);
}
}
static gboolean
g_memory_settings_backend_get_writable (GSettingsBackend *backend,
const gchar *name)
{
return TRUE;
}
static GPermission *
g_memory_settings_backend_get_permission (GSettingsBackend *backend,
const gchar *path)
{
return g_simple_permission_new (TRUE);
}
static void
g_memory_settings_backend_finalize (GObject *object)
{
GMemorySettingsBackend *memory = G_MEMORY_SETTINGS_BACKEND (object);
g_hash_table_unref (memory->table);
G_OBJECT_CLASS (g_memory_settings_backend_parent_class)
->finalize (object);
}
static void
g_memory_settings_backend_init (GMemorySettingsBackend *memory)
{
memory->table = g_hash_table_new_full (g_str_hash, g_str_equal, g_free,
(GDestroyNotify) g_variant_unref);
}
static void
g_memory_settings_backend_class_init (GMemorySettingsBackendClass *class)
{
GSettingsBackendClass *backend_class = G_SETTINGS_BACKEND_CLASS (class);
GObjectClass *object_class = G_OBJECT_CLASS (class);
backend_class->read = g_memory_settings_backend_read;
backend_class->write = g_memory_settings_backend_write;
backend_class->write_tree = g_memory_settings_backend_write_tree;
backend_class->reset = g_memory_settings_backend_reset;
backend_class->get_writable = g_memory_settings_backend_get_writable;
backend_class->get_permission = g_memory_settings_backend_get_permission;
object_class->finalize = g_memory_settings_backend_finalize;
}
/**
* g_memory_settings_backend_new:
*
* Creates a memory-backed #GSettingsBackend.
*
* This backend allows changes to settings, but does not write them
* to any backing storage, so the next time you run your application,
* the memory backend will start out with the default values again.
*
* Returns: (transfer full): a newly created #GSettingsBackend
*
* Since: 2.28
*/
GSettingsBackend *
g_memory_settings_backend_new (void)
{
return g_object_new (G_TYPE_MEMORY_SETTINGS_BACKEND, NULL);
}
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