1 /* GObject - GLib Type, Object, Parameter and Signal Library
2 * Copyright (C) 1997-1999, 2000-2001 Tim Janik and Red Hat, Inc.
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 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 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General
15 * Public 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.
27 #include "gvaluecollector.h"
28 #include "gbsearcharray.h"
31 /* --- typedefs & structures --- */
39 /* --- prototypes --- */
40 static gint transform_entries_cmp (gconstpointer bsearch_node1,
41 gconstpointer bsearch_node2);
44 /* --- variables --- */
45 static GBSearchArray transform_array = {
46 transform_entries_cmp,
47 sizeof (TransformEntry),
53 /* --- functions --- */
54 static inline void /* keep this function in sync with gvaluecollector.h and gboxed.c */
55 value_meminit (GValue *value,
58 value->g_type = value_type;
59 memset (value->data, 0, sizeof (value->data));
63 g_value_init (GValue *value,
66 /* g_return_val_if_fail (G_TYPE_IS_VALUE (g_type), NULL); be more elaborate below */
67 g_return_val_if_fail (value != NULL, NULL);
68 /* g_return_val_if_fail (G_VALUE_TYPE (value) == 0, NULL); be more elaborate below */
70 if (G_TYPE_IS_VALUE (g_type) && G_VALUE_TYPE (value) == 0)
72 GTypeValueTable *value_table = g_type_value_table_peek (g_type);
75 value_meminit (value, g_type);
76 value_table->value_init (value);
78 else if (G_VALUE_TYPE (value))
79 g_warning ("%s: cannot initialize GValue with type `%s', the value has already been initialized as `%s'",
82 g_type_name (G_VALUE_TYPE (value)));
83 else /* !G_TYPE_IS_VALUE (g_type) */
84 g_warning ("%s: cannot initialize GValue with type `%s', %s",
87 g_type_value_table_peek (g_type) ?
88 "this type is abstract with regards to GValue use, use a more specific (derived) type" :
89 "this type has no GTypeValueTable implementation");
94 g_value_copy (const GValue *src_value,
97 g_return_if_fail (G_IS_VALUE (src_value));
98 g_return_if_fail (G_IS_VALUE (dest_value));
99 g_return_if_fail (g_value_type_compatible (G_VALUE_TYPE (src_value), G_VALUE_TYPE (dest_value)));
101 if (src_value != dest_value)
103 GType dest_type = G_VALUE_TYPE (dest_value);
104 GTypeValueTable *value_table = g_type_value_table_peek (dest_type);
106 /* make sure dest_value's value is free()d */
107 if (value_table->value_free)
108 value_table->value_free (dest_value);
111 value_meminit (dest_value, dest_type);
112 value_table->value_copy (src_value, dest_value);
117 g_value_reset (GValue *value)
119 GTypeValueTable *value_table;
122 g_return_val_if_fail (G_IS_VALUE (value), NULL);
124 g_type = G_VALUE_TYPE (value);
125 value_table = g_type_value_table_peek (g_type);
127 /* make sure value's value is free()d */
128 if (value_table->value_free)
129 value_table->value_free (value);
132 value_meminit (value, g_type);
133 value_table->value_init (value);
139 g_value_unset (GValue *value)
141 GTypeValueTable *value_table;
143 g_return_if_fail (G_IS_VALUE (value));
145 value_table = g_type_value_table_peek (G_VALUE_TYPE (value));
147 if (value_table->value_free)
148 value_table->value_free (value);
149 memset (value, 0, sizeof (*value));
153 g_value_fits_pointer (const GValue *value)
155 GTypeValueTable *value_table;
157 g_return_val_if_fail (G_IS_VALUE (value), FALSE);
159 value_table = g_type_value_table_peek (G_VALUE_TYPE (value));
161 return value_table->value_peek_pointer != NULL;
165 g_value_peek_pointer (const GValue *value)
167 GTypeValueTable *value_table;
169 g_return_val_if_fail (G_IS_VALUE (value), NULL);
171 value_table = g_type_value_table_peek (G_VALUE_TYPE (value));
172 if (!value_table->value_peek_pointer)
173 g_return_val_if_fail (g_value_fits_pointer (value) == TRUE, NULL);
175 return value_table->value_peek_pointer (value);
179 g_value_set_instance (GValue *value,
183 GTypeValueTable *value_table;
187 g_return_if_fail (G_IS_VALUE (value));
190 g_return_if_fail (G_TYPE_CHECK_INSTANCE (instance));
191 g_return_if_fail (g_value_type_compatible (G_TYPE_FROM_INSTANCE (instance), G_VALUE_TYPE (value)));
194 g_type = G_VALUE_TYPE (value);
195 value_table = g_type_value_table_peek (g_type);
197 g_return_if_fail (strcmp (value_table->collect_format, "p") == 0);
199 memset (&cvalue, 0, sizeof (cvalue));
200 cvalue.v_pointer = instance;
202 /* make sure value's value is free()d */
203 if (value_table->value_free)
204 value_table->value_free (value);
206 /* setup and collect */
207 value_meminit (value, g_type);
208 error_msg = value_table->collect_value (value, 1, &cvalue, 0);
211 g_warning ("%s: %s", G_STRLOC, error_msg);
214 /* we purposely leak the value here, it might not be
215 * in a sane state if an error condition occoured
217 value_meminit (value, g_type);
218 value_table->value_init (value);
222 static GValueTransform
223 transform_func_lookup (GType src_type,
226 TransformEntry entry;
228 entry.src_type = src_type;
231 entry.dest_type = dest_type;
236 e = g_bsearch_array_lookup (&transform_array, &entry);
239 /* need to check that there hasn't been a change in value handling */
240 if (g_type_value_table_peek (entry.dest_type) == g_type_value_table_peek (dest_type) &&
241 g_type_value_table_peek (entry.src_type) == g_type_value_table_peek (src_type))
244 entry.dest_type = g_type_parent (entry.dest_type);
246 while (entry.dest_type);
248 entry.src_type = g_type_parent (entry.src_type);
250 while (entry.src_type);
256 transform_entries_cmp (gconstpointer bsearch_node1,
257 gconstpointer bsearch_node2)
259 const TransformEntry *e1 = bsearch_node1;
260 const TransformEntry *e2 = bsearch_node2;
261 gint cmp = G_BSEARCH_ARRAY_CMP (e1->src_type, e2->src_type);
266 return G_BSEARCH_ARRAY_CMP (e1->dest_type, e2->dest_type);
270 g_value_register_transform_func (GType src_type,
272 GValueTransform transform_func)
274 TransformEntry entry;
276 g_return_if_fail (G_TYPE_HAS_VALUE_TABLE (src_type));
277 g_return_if_fail (G_TYPE_HAS_VALUE_TABLE (dest_type));
278 g_return_if_fail (transform_func != NULL);
280 if (transform_func_lookup (src_type, dest_type))
281 g_warning ("reregistering value transformation function (%p) for `%s' to `%s'",
283 g_type_name (src_type),
284 g_type_name (dest_type));
285 entry.src_type = src_type;
286 entry.dest_type = dest_type;
287 entry.func = transform_func;
288 g_bsearch_array_insert (&transform_array, &entry, TRUE);
292 g_value_type_transformable (GType src_type,
295 g_return_val_if_fail (G_TYPE_IS_VALUE (src_type), FALSE);
296 g_return_val_if_fail (G_TYPE_IS_VALUE (dest_type), FALSE);
298 return (g_value_type_compatible (src_type, dest_type) ||
299 transform_func_lookup (src_type, dest_type) != NULL);
303 g_value_type_compatible (GType src_type,
306 g_return_val_if_fail (G_TYPE_IS_VALUE (src_type), FALSE);
307 g_return_val_if_fail (G_TYPE_IS_VALUE (dest_type), FALSE);
309 return (g_type_is_a (src_type, dest_type) &&
310 g_type_value_table_peek (dest_type) == g_type_value_table_peek (src_type));
314 g_value_transform (const GValue *src_value,
319 g_return_val_if_fail (G_IS_VALUE (src_value), FALSE);
320 g_return_val_if_fail (G_IS_VALUE (dest_value), FALSE);
322 dest_type = G_VALUE_TYPE (dest_value);
323 if (g_value_type_compatible (G_VALUE_TYPE (src_value), dest_type))
325 g_value_copy (src_value, dest_value);
331 GValueTransform transform = transform_func_lookup (G_VALUE_TYPE (src_value), dest_type);
335 g_value_unset (dest_value);
337 /* setup and transform */
338 value_meminit (dest_value, dest_type);
339 transform (src_value, dest_value);