1 /* ATK - Accessibility Toolkit
2 * Copyright 2001 Sun Microsystems Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, 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 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library 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.
20 #include "atkregistry.h"
21 #include "atknoopobjectfactory.h"
23 static AtkRegistry *default_registry = NULL;;
25 static void atk_registry_init (AtkRegistry *instance,
26 AtkRegistryClass *klass);
27 static void atk_registry_finalize (GObject *instance);
28 static void atk_registry_class_init (AtkRegistryClass *klass);
30 static AtkRegistry* atk_registry_new ();
31 static GType atk_registry_get_factory_type (AtkRegistry *registry,
35 atk_registry_get_type (void)
37 static GType type = 0;
41 static const GTypeInfo info =
43 sizeof (AtkRegistryClass),
44 (GBaseInitFunc) NULL, /* base_init */
45 (GBaseFinalizeFunc) NULL, /* base_finalize */
46 (GClassInitFunc) atk_registry_class_init, /* class_init */
47 (GClassFinalizeFunc) NULL, /* class_finalize */
48 NULL, /* class_data */
49 sizeof (AtkRegistry), /* instance size */
51 (GInstanceInitFunc) atk_registry_init, /* instance init */
52 NULL /* value table */
55 type = g_type_register_static (G_TYPE_OBJECT, "AtkRegistry", &info, 0);
62 atk_registry_class_init (AtkRegistryClass *klass)
64 GObjectClass *object_class;
66 /* is paranoia appropriate in a class initializer ? */
67 g_return_if_fail (G_IS_OBJECT_CLASS (klass));
69 object_class = G_OBJECT_CLASS (klass);
70 object_class->finalize = atk_registry_finalize;
71 default_registry = atk_registry_new ();
76 * Cannot define a class_finalize function when calling
77 * g_type_register_static()
80 atk_registry_class_finalize (GObjectClass *klass)
82 g_return_if_fail (ATK_IS_REGISTRY_CLASS (klass));
84 g_free (default_registry);
89 atk_registry_init (AtkRegistry *instance, AtkRegistryClass *klass)
91 instance->factory_type_registry = g_hash_table_new (NULL, NULL);
92 instance->factory_singleton_cache = g_hash_table_new (NULL, NULL);
100 object = g_object_new (ATK_TYPE_REGISTRY, NULL);
102 g_return_val_if_fail ((object != NULL), NULL);
103 g_return_val_if_fail (ATK_IS_REGISTRY (object), NULL);
105 return (AtkRegistry *) object;
109 atk_registry_finalize (GObject *instance)
111 AtkRegistry *registry;
113 g_return_if_fail (ATK_IS_REGISTRY (instance));
114 registry = ATK_REGISTRY (instance);
115 g_free (registry->factory_type_registry);
116 g_free (registry->factory_singleton_cache);
120 * atk_registry_set_factory_type:
121 * @registry: the #AtkRegistry in which to register the type association
122 * @type: an #AtkObject type
123 * @factory_type: an #AtkObjectFactory type to associate with @type
125 * Associate an #AtkObjectFactory subclass with a #GType. Note:
126 * The associated @factory_type will thereafter be responsible for
127 * the creation of new #AtkObject implementations for instances
131 atk_registry_set_factory_type (AtkRegistry *registry,
137 AtkObjectFactory *old_factory;
139 g_return_if_fail (ATK_IS_REGISTRY (registry));
141 value = g_hash_table_lookup (registry->factory_type_registry,
142 GUINT_TO_POINTER (type));
143 old_type = GPOINTER_TO_UINT (value);
144 if (old_type && old_type != factory_type)
146 g_hash_table_remove (registry->factory_type_registry,
147 GUINT_TO_POINTER (type));
149 * If the old factory was created, notify it that it has
150 * been replaced, then free it.
152 old_factory = g_hash_table_lookup (registry->factory_singleton_cache,
153 GUINT_TO_POINTER (old_type));
156 atk_object_factory_invalidate (old_factory);
157 g_type_free_instance ((GTypeInstance *) old_factory);
160 g_hash_table_insert (registry->factory_type_registry,
161 GUINT_TO_POINTER (type),
162 GUINT_TO_POINTER (factory_type));
166 * atk_registry_get_factory_type:
167 * @registry: an #AtkRegistry
168 * @type: a #GType with which to look up the associated #AtkObjectFactory
171 * Provides a #GType indicating the #AtkObjectFactory subclass
172 * associated with type @type
174 * Returns: a #GType associated with type @type
177 atk_registry_get_factory_type (AtkRegistry *registry,
184 * look up factory type in first hash;
185 * if there isn't an explicitly registered factory type,
186 * try inheriting one...
190 g_hash_table_lookup (registry->factory_type_registry,
191 GUINT_TO_POINTER (type));
192 type = g_type_parent (type);
193 if (type == G_TYPE_INVALID)
197 } while (value == NULL);
199 factory_type = GPOINTER_TO_UINT (value);
204 * atk_registry_get_factory:
205 * @registry: an #AtkRegistry
206 * @type: a #GType with which to look up the associated #AtkObjectFactory
208 * Gets an #AtkObjectFactory appropriate for creating #AtkObjects
211 * Returns: an #AtkObjectFactory appropriate for creating #AtkObjects
215 atk_registry_get_factory (AtkRegistry *registry,
218 gpointer factory_pointer = NULL;
221 factory_type = atk_registry_get_factory_type (registry, type);
223 if (factory_type == G_TYPE_INVALID)
225 /* Factory type has not been specified for this object type */
226 static AtkObjectFactory* default_factory = NULL;
228 if (!default_factory)
229 default_factory = atk_no_op_object_factory_new ();
231 return default_factory;
234 /* ask second hashtable for instance of factory type */
236 g_hash_table_lookup (registry->factory_singleton_cache,
237 GUINT_TO_POINTER (factory_type));
239 /* if there isn't one already, create one and save it */
240 if (factory_pointer == NULL)
242 factory_pointer = g_type_create_instance (factory_type);
243 g_hash_table_insert (registry->factory_singleton_cache,
244 GUINT_TO_POINTER (factory_type),
248 return ATK_OBJECT_FACTORY (factory_pointer);
252 *atk_get_default_registry:
254 * Gets a default implementation of the #AtkObjectFactory/type
256 * Note: For most toolkit maintainers, this will be the correct
257 * registry for registering new #AtkObject factories. Following
258 * a call to this function, maintainers may call atk_registry_set_factory_type()
259 * to associate an #AtkObjectFactory subclass with the GType of objects
260 * for whom accessability information will be provided.
262 * Returns: a default implementation of the #AtkObjectFactory/type
266 atk_get_default_registry ()
268 if (!default_registry)
270 default_registry = atk_registry_new();
272 return default_registry;