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 2.1 of the License, 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, see <http://www.gnu.org/licenses/>.
16 *
17 * Author: Ryan Lortie <desrt@desrt.ca>
18 */
19
20#include "config.h"
21
22#include "gsimplepermission.h"
23#include "gsettingsbackendinternal.h"
24#include "giomodule.h"
25
26
27#define G_TYPE_MEMORY_SETTINGS_BACKEND (g_memory_settings_backend_get_type())
28#define G_MEMORY_SETTINGS_BACKEND(inst) (G_TYPE_CHECK_INSTANCE_CAST ((inst), \
29 G_TYPE_MEMORY_SETTINGS_BACKEND, \
30 GMemorySettingsBackend))
31
32typedef GSettingsBackendClass GMemorySettingsBackendClass;
33typedef struct
34{
35 GSettingsBackend parent_instance;
36 GHashTable *table;
37} GMemorySettingsBackend;
38
39G_DEFINE_TYPE_WITH_CODE (GMemorySettingsBackend,
40 g_memory_settings_backend,
41 G_TYPE_SETTINGS_BACKEND,
42 g_io_extension_point_implement (G_SETTINGS_BACKEND_EXTENSION_POINT_NAME,
43 g_define_type_id, "memory", 10))
44
45static GVariant *
46g_memory_settings_backend_read (GSettingsBackend *backend,
47 const gchar *key,
48 const GVariantType *expected_type,
49 gboolean default_value)
50{
51 GMemorySettingsBackend *memory = G_MEMORY_SETTINGS_BACKEND (backend);
52 GVariant *value;
53
54 if (default_value)
55 return NULL;
56
57 value = g_hash_table_lookup (hash_table: memory->table, key);
58
59 if (value != NULL)
60 g_variant_ref (value);
61
62 return value;
63}
64
65static gboolean
66g_memory_settings_backend_write (GSettingsBackend *backend,
67 const gchar *key,
68 GVariant *value,
69 gpointer origin_tag)
70{
71 GMemorySettingsBackend *memory = G_MEMORY_SETTINGS_BACKEND (backend);
72 GVariant *old_value;
73
74 old_value = g_hash_table_lookup (hash_table: memory->table, key);
75 g_variant_ref_sink (value);
76
77 if (old_value == NULL || !g_variant_equal (one: value, two: old_value))
78 {
79 g_hash_table_insert (hash_table: memory->table, key: g_strdup (str: key), value);
80 g_settings_backend_changed (backend, key, origin_tag);
81 }
82 else
83 g_variant_unref (value);
84
85 return TRUE;
86}
87
88static gboolean
89g_memory_settings_backend_write_one (gpointer key,
90 gpointer value,
91 gpointer data)
92{
93 GMemorySettingsBackend *memory = data;
94
95 if (value != NULL)
96 g_hash_table_insert (hash_table: memory->table, key: g_strdup (str: key), value: g_variant_ref (value));
97 else
98 g_hash_table_remove (hash_table: memory->table, key);
99
100 return FALSE;
101}
102
103static gboolean
104g_memory_settings_backend_write_tree (GSettingsBackend *backend,
105 GTree *tree,
106 gpointer origin_tag)
107{
108 g_tree_foreach (tree, func: g_memory_settings_backend_write_one, user_data: backend);
109 g_settings_backend_changed_tree (backend, tree, origin_tag);
110
111 return TRUE;
112}
113
114static void
115g_memory_settings_backend_reset (GSettingsBackend *backend,
116 const gchar *key,
117 gpointer origin_tag)
118{
119 GMemorySettingsBackend *memory = G_MEMORY_SETTINGS_BACKEND (backend);
120
121 if (g_hash_table_lookup (hash_table: memory->table, key))
122 {
123 g_hash_table_remove (hash_table: memory->table, key);
124 g_settings_backend_changed (backend, key, origin_tag);
125 }
126}
127
128static gboolean
129g_memory_settings_backend_get_writable (GSettingsBackend *backend,
130 const gchar *name)
131{
132 return TRUE;
133}
134
135static GPermission *
136g_memory_settings_backend_get_permission (GSettingsBackend *backend,
137 const gchar *path)
138{
139 return g_simple_permission_new (TRUE);
140}
141
142static void
143g_memory_settings_backend_finalize (GObject *object)
144{
145 GMemorySettingsBackend *memory = G_MEMORY_SETTINGS_BACKEND (object);
146
147 g_hash_table_unref (hash_table: memory->table);
148
149 G_OBJECT_CLASS (g_memory_settings_backend_parent_class)
150 ->finalize (object);
151}
152
153static void
154g_memory_settings_backend_init (GMemorySettingsBackend *memory)
155{
156 memory->table = g_hash_table_new_full (hash_func: g_str_hash, key_equal_func: g_str_equal, key_destroy_func: g_free,
157 value_destroy_func: (GDestroyNotify) g_variant_unref);
158}
159
160static void
161g_memory_settings_backend_class_init (GMemorySettingsBackendClass *class)
162{
163 GSettingsBackendClass *backend_class = G_SETTINGS_BACKEND_CLASS (class);
164 GObjectClass *object_class = G_OBJECT_CLASS (class);
165
166 backend_class->read = g_memory_settings_backend_read;
167 backend_class->write = g_memory_settings_backend_write;
168 backend_class->write_tree = g_memory_settings_backend_write_tree;
169 backend_class->reset = g_memory_settings_backend_reset;
170 backend_class->get_writable = g_memory_settings_backend_get_writable;
171 backend_class->get_permission = g_memory_settings_backend_get_permission;
172 object_class->finalize = g_memory_settings_backend_finalize;
173}
174
175/**
176 * g_memory_settings_backend_new:
177 *
178 * Creates a memory-backed #GSettingsBackend.
179 *
180 * This backend allows changes to settings, but does not write them
181 * to any backing storage, so the next time you run your application,
182 * the memory backend will start out with the default values again.
183 *
184 * Returns: (transfer full): a newly created #GSettingsBackend
185 *
186 * Since: 2.28
187 */
188GSettingsBackend *
189g_memory_settings_backend_new (void)
190{
191 return g_object_new (G_TYPE_MEMORY_SETTINGS_BACKEND, NULL);
192}
193

source code of gtk/subprojects/glib/gio/gmemorysettingsbackend.c