2 * Copyright © 2009, 2010 Codethink Limited
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.
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.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
19 * Author: Ryan Lortie <desrt@desrt.ca>
24 #include "gdelayedsettingsbackend.h"
25 #include "gsettingsbackendinternal.h"
31 struct _GDelayedSettingsBackendPrivate
33 GSettingsBackend *backend;
38 G_DEFINE_TYPE (GDelayedSettingsBackend,
39 g_delayed_settings_backend,
40 G_TYPE_SETTINGS_BACKEND)
43 g_delayed_settings_backend_read (GSettingsBackend *backend,
45 const GVariantType *expected_type,
46 gboolean default_value)
48 GDelayedSettingsBackend *delayed = G_DELAYED_SETTINGS_BACKEND (backend);
52 (result = g_tree_lookup (delayed->priv->delayed, key)))
53 return g_variant_ref (result);
55 return g_settings_backend_read (delayed->priv->backend,
56 key, expected_type, default_value);
59 g_delayed_settings_backend_write (GSettingsBackend *backend,
64 GDelayedSettingsBackend *delayed = G_DELAYED_SETTINGS_BACKEND (backend);
67 was_empty = g_tree_nnodes (delayed->priv->delayed) == 0;
68 g_tree_insert (delayed->priv->delayed, g_strdup (key),
69 g_variant_ref_sink (value));
70 g_settings_backend_changed (backend, key, origin_tag);
72 if (was_empty && delayed->priv->owner)
73 g_object_notify (delayed->priv->owner, "has-unapplied");
79 add_to_tree (gpointer key,
83 g_tree_insert (user_data, g_strdup (key), g_variant_ref (value));
88 g_delayed_settings_backend_write_keys (GSettingsBackend *backend,
92 GDelayedSettingsBackend *delayed = G_DELAYED_SETTINGS_BACKEND (backend);
95 was_empty = g_tree_nnodes (delayed->priv->delayed) == 0;
97 g_tree_foreach (tree, add_to_tree, delayed->priv->delayed);
99 g_settings_backend_changed_tree (backend, tree, origin_tag);
101 if (was_empty && delayed->priv->owner)
102 g_object_notify (delayed->priv->owner, "has-unapplied");
108 g_delayed_settings_backend_get_writable (GSettingsBackend *backend,
111 GDelayedSettingsBackend *delayed = G_DELAYED_SETTINGS_BACKEND (backend);
113 return g_settings_backend_get_writable (delayed->priv->backend, name);
117 g_delayed_settings_backend_reset (GSettingsBackend *backend,
121 /* deal with this... */
125 g_delayed_settings_backend_reset_path (GSettingsBackend *backend,
129 /* deal with this... */
133 g_delayed_settings_backend_subscribe (GSettingsBackend *backend,
136 GDelayedSettingsBackend *delayed = G_DELAYED_SETTINGS_BACKEND (backend);
138 g_settings_backend_subscribe (delayed->priv->backend, name);
142 g_delayed_settings_backend_unsubscribe (GSettingsBackend *backend,
145 GDelayedSettingsBackend *delayed = G_DELAYED_SETTINGS_BACKEND (backend);
147 g_settings_backend_unsubscribe (delayed->priv->backend, name);
153 g_delayed_settings_backend_get_has_unapplied (GDelayedSettingsBackend *delayed)
155 return g_tree_nnodes (delayed->priv->delayed) > 0;
159 g_delayed_settings_backend_apply (GDelayedSettingsBackend *delayed)
161 if (g_tree_nnodes (delayed->priv->delayed) > 0)
166 tmp = delayed->priv->delayed;
167 delayed->priv->delayed = g_settings_backend_create_tree ();
168 success = g_settings_backend_write_keys (delayed->priv->backend,
172 g_settings_backend_changed_tree (G_SETTINGS_BACKEND (delayed),
177 if (delayed->priv->owner)
178 g_object_notify (delayed->priv->owner, "has-unapplied");
183 g_delayed_settings_backend_revert (GDelayedSettingsBackend *delayed)
185 if (g_tree_nnodes (delayed->priv->delayed) > 0)
189 tmp = delayed->priv->delayed;
190 delayed->priv->delayed = g_settings_backend_create_tree ();
191 g_settings_backend_changed_tree (G_SETTINGS_BACKEND (delayed), tmp, NULL);
194 if (delayed->priv->owner)
195 g_object_notify (delayed->priv->owner, "has-unapplied");
199 /* change notification */
201 delayed_backend_changed (GSettingsBackend *backend,
206 GDelayedSettingsBackend *delayed = G_DELAYED_SETTINGS_BACKEND (user_data);
208 if (origin_tag != delayed->priv)
209 g_settings_backend_changed (G_SETTINGS_BACKEND (delayed),
214 delayed_backend_keys_changed (GSettingsBackend *backend,
216 const gchar * const *items,
220 GDelayedSettingsBackend *delayed = G_DELAYED_SETTINGS_BACKEND (user_data);
222 if (origin_tag != delayed->priv)
223 g_settings_backend_keys_changed (G_SETTINGS_BACKEND (delayed),
224 path, items, origin_tag);
228 delayed_backend_path_changed (GSettingsBackend *backend,
233 GDelayedSettingsBackend *delayed = G_DELAYED_SETTINGS_BACKEND (user_data);
235 if (origin_tag != delayed->priv)
236 g_settings_backend_path_changed (G_SETTINGS_BACKEND (delayed),
241 delayed_backend_writable_changed (GSettingsBackend *backend,
245 GDelayedSettingsBackend *delayed = G_DELAYED_SETTINGS_BACKEND (user_data);
247 if (g_tree_lookup (delayed->priv->delayed, key) &&
248 !g_settings_backend_get_writable (delayed->priv->backend, key))
250 /* drop the key from our changeset if it just became read-only.
251 * no need to signal this since the writable change implies it.
253 g_tree_remove (delayed->priv->delayed, key);
255 /* if that was the only key... */
256 if (delayed->priv->owner &&
257 g_tree_nnodes (delayed->priv->delayed) == 0)
258 g_object_notify (delayed->priv->owner, "has-unapplied");
261 g_settings_backend_writable_changed (G_SETTINGS_BACKEND (delayed), key);
264 /* slow method until we get foreach-with-remove in GTree
274 check_prefix (gpointer key,
278 CheckPrefixState *state = data;
280 if (g_str_has_prefix (key, state->path))
281 state->keys[state->index++] = key;
287 delayed_backend_path_writable_changed (GSettingsBackend *backend,
291 GDelayedSettingsBackend *delayed = G_DELAYED_SETTINGS_BACKEND (user_data);
294 n_keys = g_tree_nnodes (delayed->priv->delayed);
298 CheckPrefixState state = { path, g_new (const gchar *, n_keys) };
301 /* collect a list of possibly-affected keys (ie: matching the path) */
302 g_tree_foreach (delayed->priv->delayed, check_prefix, &state);
304 /* drop the keys that have been affected */
305 for (i = 0; i < state.index; i++)
306 if (!g_settings_backend_get_writable (delayed->priv->backend,
308 g_tree_remove (delayed->priv->delayed, state.keys[i]);
312 if (delayed->priv->owner &&
313 g_tree_nnodes (delayed->priv->delayed) == 0)
314 g_object_notify (delayed->priv->owner, "has-unapplied");
317 g_settings_backend_path_writable_changed (G_SETTINGS_BACKEND (delayed),
322 g_delayed_settings_backend_finalize (GObject *object)
324 GDelayedSettingsBackend *delayed = G_DELAYED_SETTINGS_BACKEND (object);
326 g_settings_backend_unwatch (delayed->priv->backend, delayed);
327 g_object_unref (delayed->priv->backend);
331 g_delayed_settings_backend_class_init (GDelayedSettingsBackendClass *class)
333 GSettingsBackendClass *backend_class = G_SETTINGS_BACKEND_CLASS (class);
334 GObjectClass *object_class = G_OBJECT_CLASS (class);
336 g_type_class_add_private (class, sizeof (GDelayedSettingsBackendPrivate));
338 backend_class->read = g_delayed_settings_backend_read;
339 backend_class->write = g_delayed_settings_backend_write;
340 backend_class->write_keys = g_delayed_settings_backend_write_keys;
341 backend_class->reset = g_delayed_settings_backend_reset;
342 backend_class->reset_path = g_delayed_settings_backend_reset_path;
343 backend_class->get_writable = g_delayed_settings_backend_get_writable;
344 backend_class->subscribe = g_delayed_settings_backend_subscribe;
345 backend_class->unsubscribe = g_delayed_settings_backend_unsubscribe;
347 object_class->finalize = g_delayed_settings_backend_finalize;
351 g_delayed_settings_backend_init (GDelayedSettingsBackend *delayed)
354 G_TYPE_INSTANCE_GET_PRIVATE (delayed, G_TYPE_DELAYED_SETTINGS_BACKEND,
355 GDelayedSettingsBackendPrivate);
357 delayed->priv->delayed = g_settings_backend_create_tree ();
360 GDelayedSettingsBackend *
361 g_delayed_settings_backend_new (GSettingsBackend *backend,
364 GDelayedSettingsBackend *delayed;
366 delayed = g_object_new (G_TYPE_DELAYED_SETTINGS_BACKEND, NULL);
367 delayed->priv->backend = g_object_ref (backend);
368 delayed->priv->owner = owner;
370 g_settings_backend_watch (delayed->priv->backend, NULL,
371 delayed_backend_changed,
372 delayed_backend_path_changed,
373 delayed_backend_keys_changed,
374 delayed_backend_writable_changed,
375 delayed_backend_path_writable_changed,