1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
/*
* Copyright © 2010 Codethink Limited
*
* 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 of the licence, 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: Ryan Lortie <desrt@desrt.ca>
*/
#include "config.h"
#include "gsimplepermission.h"
#include "gsettingsbackendinternal.h"
#include "giomodule.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_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);
}
|
