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1 office 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, 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  
32 typedef GSettingsBackendClass GMemorySettingsBackendClass;
33 typedef struct
34 {
35 GSettingsBackend parent_instance;
36 GHashTable *table;
37 } GMemorySettingsBackend;
38  
39 G_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  
45 static GVariant *
46 g_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 (memory->table, key);
58  
59 if (value != NULL)
60 g_variant_ref (value);
61  
62 return value;
63 }
64  
65 static gboolean
66 g_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 (memory->table, key);
75 g_variant_ref_sink (value);
76  
77 if (old_value == NULL || !g_variant_equal (value, old_value))
78 {
79 g_hash_table_insert (memory->table, g_strdup (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  
88 static gboolean
89 g_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 (memory->table, g_strdup (key), g_variant_ref (value));
97 else
98 g_hash_table_remove (memory->table, key);
99  
100 return FALSE;
101 }
102  
103 static gboolean
104 g_memory_settings_backend_write_tree (GSettingsBackend *backend,
105 GTree *tree,
106 gpointer origin_tag)
107 {
108 g_tree_foreach (tree, g_memory_settings_backend_write_one, backend);
109 g_settings_backend_changed_tree (backend, tree, origin_tag);
110  
111 return TRUE;
112 }
113  
114 static void
115 g_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 (memory->table, key))
122 {
123 g_hash_table_remove (memory->table, key);
124 g_settings_backend_changed (backend, key, origin_tag);
125 }
126 }
127  
128 static gboolean
129 g_memory_settings_backend_get_writable (GSettingsBackend *backend,
130 const gchar *name)
131 {
132 return TRUE;
133 }
134  
135 static GPermission *
136 g_memory_settings_backend_get_permission (GSettingsBackend *backend,
137 const gchar *path)
138 {
139 return g_simple_permission_new (TRUE);
140 }
141  
142 static void
143 g_memory_settings_backend_finalize (GObject *object)
144 {
145 GMemorySettingsBackend *memory = G_MEMORY_SETTINGS_BACKEND (object);
146  
147 g_hash_table_unref (memory->table);
148  
149 G_OBJECT_CLASS (g_memory_settings_backend_parent_class)
150 ->finalize (object);
151 }
152  
153 static void
154 g_memory_settings_backend_init (GMemorySettingsBackend *memory)
155 {
156 memory->table = g_hash_table_new_full (g_str_hash, g_str_equal, g_free,
157 (GDestroyNotify) g_variant_unref);
158 }
159  
160 static void
161 g_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 */
188 GSettingsBackend *
189 g_memory_settings_backend_new (void)
190 {
191 return g_object_new (G_TYPE_MEMORY_SETTINGS_BACKEND, NULL);
192 }