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.
29 #include "gparamspecs.h"
30 #include "gvaluecollector.h"
35 * @short_description: Metadata for parameter specifications
36 * @see_also: g_object_class_install_property(), g_object_set(),
37 * g_object_get(), g_object_set_property(), g_object_get_property(),
38 * g_value_register_transform_func()
41 * #GParamSpec is an object structure that encapsulates the metadata
42 * required to specify parameters, such as e.g. #GObject properties.
44 * <para id="canonical-parameter-name">
45 * Parameter names need to start with a letter (a-z or A-Z). Subsequent
46 * characters can be letters, numbers or a '-'.
47 * All other characters are replaced by a '-' during construction.
48 * The result of this replacement is called the canonical name of the
55 #define PARAM_FLOATING_FLAG 0x2
56 #define G_PARAM_USER_MASK (~0 << G_PARAM_USER_SHIFT)
57 #define PSPEC_APPLIES_TO_VALUE(pspec, value) (G_TYPE_CHECK_VALUE_TYPE ((value), G_PARAM_SPEC_VALUE_TYPE (pspec)))
58 #define G_SLOCK(mutex) g_static_mutex_lock (mutex)
59 #define G_SUNLOCK(mutex) g_static_mutex_unlock (mutex)
62 /* --- prototypes --- */
63 static void g_param_spec_class_base_init (GParamSpecClass *class);
64 static void g_param_spec_class_base_finalize (GParamSpecClass *class);
65 static void g_param_spec_class_init (GParamSpecClass *class,
67 static void g_param_spec_init (GParamSpec *pspec,
68 GParamSpecClass *class);
69 static void g_param_spec_finalize (GParamSpec *pspec);
70 static void value_param_init (GValue *value);
71 static void value_param_free_value (GValue *value);
72 static void value_param_copy_value (const GValue *src_value,
74 static void value_param_transform_value (const GValue *src_value,
76 static gpointer value_param_peek_pointer (const GValue *value);
77 static gchar* value_param_collect_value (GValue *value,
78 guint n_collect_values,
79 GTypeCValue *collect_values,
81 static gchar* value_param_lcopy_value (const GValue *value,
82 guint n_collect_values,
83 GTypeCValue *collect_values,
87 /* --- functions --- */
89 _g_param_type_init (void)
91 static const GTypeFundamentalInfo finfo = {
92 (G_TYPE_FLAG_CLASSED |
93 G_TYPE_FLAG_INSTANTIATABLE |
94 G_TYPE_FLAG_DERIVABLE |
95 G_TYPE_FLAG_DEEP_DERIVABLE),
97 static const GTypeValueTable param_value_table = {
98 value_param_init, /* value_init */
99 value_param_free_value, /* value_free */
100 value_param_copy_value, /* value_copy */
101 value_param_peek_pointer, /* value_peek_pointer */
102 "p", /* collect_format */
103 value_param_collect_value, /* collect_value */
104 "p", /* lcopy_format */
105 value_param_lcopy_value, /* lcopy_value */
107 static const GTypeInfo param_spec_info = {
108 sizeof (GParamSpecClass),
110 (GBaseInitFunc) g_param_spec_class_base_init,
111 (GBaseFinalizeFunc) g_param_spec_class_base_finalize,
112 (GClassInitFunc) g_param_spec_class_init,
113 (GClassFinalizeFunc) NULL,
114 NULL, /* class_data */
118 (GInstanceInitFunc) g_param_spec_init,
124 /* This should be registred as GParamSpec instead of GParam, for
125 * consistency sake, so that type name can be mapped to struct name,
126 * However, some language bindings, most noticable the python ones
127 * depends on the "GParam" identifier, see #548689
129 type = g_type_register_fundamental (G_TYPE_PARAM, g_intern_static_string ("GParam"), ¶m_spec_info, &finfo, G_TYPE_FLAG_ABSTRACT);
130 g_assert (type == G_TYPE_PARAM);
131 g_value_register_transform_func (G_TYPE_PARAM, G_TYPE_PARAM, value_param_transform_value);
135 g_param_spec_class_base_init (GParamSpecClass *class)
140 g_param_spec_class_base_finalize (GParamSpecClass *class)
145 g_param_spec_class_init (GParamSpecClass *class,
148 class->value_type = G_TYPE_NONE;
149 class->finalize = g_param_spec_finalize;
150 class->value_set_default = NULL;
151 class->value_validate = NULL;
152 class->values_cmp = NULL;
156 g_param_spec_init (GParamSpec *pspec,
157 GParamSpecClass *class)
161 pspec->_blurb = NULL;
163 pspec->value_type = class->value_type;
164 pspec->owner_type = 0;
166 g_datalist_set_flags (&pspec->qdata, PARAM_FLOATING_FLAG);
167 pspec->ref_count = 1;
172 g_param_spec_finalize (GParamSpec *pspec)
174 g_datalist_clear (&pspec->qdata);
176 if (!(pspec->flags & G_PARAM_STATIC_NICK))
177 g_free (pspec->_nick);
179 if (!(pspec->flags & G_PARAM_STATIC_BLURB))
180 g_free (pspec->_blurb);
182 g_type_free_instance ((GTypeInstance*) pspec);
186 * g_param_spec_ref: (skip)
187 * @pspec: a valid #GParamSpec
189 * Increments the reference count of @pspec.
191 * Returns: the #GParamSpec that was passed into this function
194 g_param_spec_ref (GParamSpec *pspec)
196 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
198 g_atomic_int_inc ((int *)&pspec->ref_count);
204 * g_param_spec_unref: (skip)
205 * @pspec: a valid #GParamSpec
207 * Decrements the reference count of a @pspec.
210 g_param_spec_unref (GParamSpec *pspec)
214 g_return_if_fail (G_IS_PARAM_SPEC (pspec));
216 is_zero = g_atomic_int_dec_and_test ((int *)&pspec->ref_count);
218 if (G_UNLIKELY (is_zero))
220 G_PARAM_SPEC_GET_CLASS (pspec)->finalize (pspec);
226 * @pspec: a valid #GParamSpec
228 * The initial reference count of a newly created #GParamSpec is 1,
229 * even though no one has explicitly called g_param_spec_ref() on it
230 * yet. So the initial reference count is flagged as "floating", until
231 * someone calls <literal>g_param_spec_ref (pspec); g_param_spec_sink
232 * (pspec);</literal> in sequence on it, taking over the initial
233 * reference count (thus ending up with a @pspec that has a reference
234 * count of 1 still, but is not flagged "floating" anymore).
237 g_param_spec_sink (GParamSpec *pspec)
240 g_return_if_fail (G_IS_PARAM_SPEC (pspec));
242 oldvalue = g_atomic_pointer_and (&pspec->qdata, ~(gsize)PARAM_FLOATING_FLAG);
243 if (oldvalue & PARAM_FLOATING_FLAG)
244 g_param_spec_unref (pspec);
248 * g_param_spec_ref_sink: (skip)
249 * @pspec: a valid #GParamSpec
251 * Convenience function to ref and sink a #GParamSpec.
254 * Returns: the #GParamSpec that was passed into this function
257 g_param_spec_ref_sink (GParamSpec *pspec)
260 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
262 oldvalue = g_atomic_pointer_and (&pspec->qdata, ~(gsize)PARAM_FLOATING_FLAG);
263 if (!(oldvalue & PARAM_FLOATING_FLAG))
264 g_param_spec_ref (pspec);
270 * g_param_spec_get_name:
271 * @pspec: a valid #GParamSpec
273 * Get the name of a #GParamSpec.
275 * The name is always an "interned" string (as per g_intern_string()).
276 * This allows for pointer-value comparisons.
278 * Returns: the name of @pspec.
281 g_param_spec_get_name (GParamSpec *pspec)
283 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
289 * g_param_spec_get_nick:
290 * @pspec: a valid #GParamSpec
292 * Get the nickname of a #GParamSpec.
294 * Returns: the nickname of @pspec.
297 g_param_spec_get_nick (GParamSpec *pspec)
299 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
305 GParamSpec *redirect_target;
307 redirect_target = g_param_spec_get_redirect_target (pspec);
308 if (redirect_target && redirect_target->_nick)
309 return redirect_target->_nick;
316 * g_param_spec_get_blurb:
317 * @pspec: a valid #GParamSpec
319 * Get the short description of a #GParamSpec.
321 * Returns: the short description of @pspec.
324 g_param_spec_get_blurb (GParamSpec *pspec)
326 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
329 return pspec->_blurb;
332 GParamSpec *redirect_target;
334 redirect_target = g_param_spec_get_redirect_target (pspec);
335 if (redirect_target && redirect_target->_blurb)
336 return redirect_target->_blurb;
343 canonicalize_key (gchar *key)
347 for (p = key; *p != 0; p++)
352 (c < '0' || c > '9') &&
353 (c < 'A' || c > 'Z') &&
354 (c < 'a' || c > 'z'))
360 is_canonical (const gchar *key)
364 for (p = key; *p != 0; p++)
369 (c < '0' || c > '9') &&
370 (c < 'A' || c > 'Z') &&
371 (c < 'a' || c > 'z'))
379 * g_param_spec_internal: (skip)
380 * @param_type: the #GType for the property; must be derived from #G_TYPE_PARAM
381 * @name: the canonical name of the property
382 * @nick: the nickname of the property
383 * @blurb: a short description of the property
384 * @flags: a combination of #GParamFlags
386 * Creates a new #GParamSpec instance.
388 * A property name consists of segments consisting of ASCII letters and
389 * digits, separated by either the '-' or '_' character. The first
390 * character of a property name must be a letter. Names which violate these
391 * rules lead to undefined behaviour.
393 * When creating and looking up a #GParamSpec, either separator can be
394 * used, but they cannot be mixed. Using '-' is considerably more
395 * efficient and in fact required when using property names as detail
396 * strings for signals.
398 * Beyond the name, #GParamSpec<!-- -->s have two more descriptive
399 * strings associated with them, the @nick, which should be suitable
400 * for use as a label for the property in a property editor, and the
401 * @blurb, which should be a somewhat longer description, suitable for
402 * e.g. a tooltip. The @nick and @blurb should ideally be localized.
404 * Returns: a newly allocated #GParamSpec instance
407 g_param_spec_internal (GType param_type,
415 g_return_val_if_fail (G_TYPE_IS_PARAM (param_type) && param_type != G_TYPE_PARAM, NULL);
416 g_return_val_if_fail (name != NULL, NULL);
417 g_return_val_if_fail ((name[0] >= 'A' && name[0] <= 'Z') || (name[0] >= 'a' && name[0] <= 'z'), NULL);
418 g_return_val_if_fail (!(flags & G_PARAM_STATIC_NAME) || is_canonical (name), NULL);
420 pspec = (gpointer) g_type_create_instance (param_type);
422 if (flags & G_PARAM_STATIC_NAME)
424 /* pspec->name is not freed if (flags & G_PARAM_STATIC_NAME) */
425 pspec->name = (gchar *) g_intern_static_string (name);
426 if (!is_canonical (pspec->name))
427 g_warning ("G_PARAM_STATIC_NAME used with non-canonical pspec name: %s", pspec->name);
431 if (is_canonical (name))
432 pspec->name = (gchar *) g_intern_string (name);
435 gchar *tmp = g_strdup (name);
436 canonicalize_key (tmp);
437 pspec->name = (gchar *) g_intern_string (tmp);
442 if (flags & G_PARAM_STATIC_NICK)
443 pspec->_nick = (gchar*) nick;
445 pspec->_nick = g_strdup (nick);
447 if (flags & G_PARAM_STATIC_BLURB)
448 pspec->_blurb = (gchar*) blurb;
450 pspec->_blurb = g_strdup (blurb);
452 pspec->flags = (flags & G_PARAM_USER_MASK) | (flags & G_PARAM_MASK);
458 * g_param_spec_get_qdata:
459 * @pspec: a valid #GParamSpec
460 * @quark: a #GQuark, naming the user data pointer
462 * Gets back user data pointers stored via g_param_spec_set_qdata().
464 * Returns: (transfer none): the user data pointer set, or %NULL
467 g_param_spec_get_qdata (GParamSpec *pspec,
470 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
472 return quark ? g_datalist_id_get_data (&pspec->qdata, quark) : NULL;
476 * g_param_spec_set_qdata:
477 * @pspec: the #GParamSpec to set store a user data pointer
478 * @quark: a #GQuark, naming the user data pointer
479 * @data: an opaque user data pointer
481 * Sets an opaque, named pointer on a #GParamSpec. The name is
482 * specified through a #GQuark (retrieved e.g. via
483 * g_quark_from_static_string()), and the pointer can be gotten back
484 * from the @pspec with g_param_spec_get_qdata(). Setting a
485 * previously set user data pointer, overrides (frees) the old pointer
486 * set, using %NULL as pointer essentially removes the data stored.
489 g_param_spec_set_qdata (GParamSpec *pspec,
493 g_return_if_fail (G_IS_PARAM_SPEC (pspec));
494 g_return_if_fail (quark > 0);
496 g_datalist_id_set_data (&pspec->qdata, quark, data);
500 * g_param_spec_set_qdata_full: (skip)
501 * @pspec: the #GParamSpec to set store a user data pointer
502 * @quark: a #GQuark, naming the user data pointer
503 * @data: an opaque user data pointer
504 * @destroy: function to invoke with @data as argument, when @data needs to
507 * This function works like g_param_spec_set_qdata(), but in addition,
508 * a <literal>void (*destroy) (gpointer)</literal> function may be
509 * specified which is called with @data as argument when the @pspec is
510 * finalized, or the data is being overwritten by a call to
511 * g_param_spec_set_qdata() with the same @quark.
514 g_param_spec_set_qdata_full (GParamSpec *pspec,
517 GDestroyNotify destroy)
519 g_return_if_fail (G_IS_PARAM_SPEC (pspec));
520 g_return_if_fail (quark > 0);
522 g_datalist_id_set_data_full (&pspec->qdata, quark, data, data ? destroy : (GDestroyNotify) NULL);
526 * g_param_spec_steal_qdata:
527 * @pspec: the #GParamSpec to get a stored user data pointer from
528 * @quark: a #GQuark, naming the user data pointer
530 * Gets back user data pointers stored via g_param_spec_set_qdata()
531 * and removes the @data from @pspec without invoking its destroy()
532 * function (if any was set). Usually, calling this function is only
533 * required to update user data pointers with a destroy notifier.
535 * Returns: (transfer none): the user data pointer set, or %NULL
538 g_param_spec_steal_qdata (GParamSpec *pspec,
541 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
542 g_return_val_if_fail (quark > 0, NULL);
544 return g_datalist_id_remove_no_notify (&pspec->qdata, quark);
548 * g_param_spec_get_redirect_target:
549 * @pspec: a #GParamSpec
551 * If the paramspec redirects operations to another paramspec,
552 * returns that paramspec. Redirect is used typically for
553 * providing a new implementation of a property in a derived
554 * type while preserving all the properties from the parent
555 * type. Redirection is established by creating a property
556 * of type #GParamSpecOverride. See g_object_class_override_property()
557 * for an example of the use of this capability.
561 * Returns: (transfer none): paramspec to which requests on this
562 * paramspec should be redirected, or %NULL if none.
565 g_param_spec_get_redirect_target (GParamSpec *pspec)
567 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
569 if (G_IS_PARAM_SPEC_OVERRIDE (pspec))
571 GParamSpecOverride *ospec = G_PARAM_SPEC_OVERRIDE (pspec);
573 return ospec->overridden;
580 * g_param_value_set_default:
581 * @pspec: a valid #GParamSpec
582 * @value: a #GValue of correct type for @pspec
584 * Sets @value to its default value as specified in @pspec.
587 g_param_value_set_default (GParamSpec *pspec,
590 g_return_if_fail (G_IS_PARAM_SPEC (pspec));
591 g_return_if_fail (G_IS_VALUE (value));
592 g_return_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value));
594 g_value_reset (value);
595 G_PARAM_SPEC_GET_CLASS (pspec)->value_set_default (pspec, value);
599 * g_param_value_defaults:
600 * @pspec: a valid #GParamSpec
601 * @value: a #GValue of correct type for @pspec
603 * Checks whether @value contains the default value as specified in @pspec.
605 * Returns: whether @value contains the canonical default for this @pspec
608 g_param_value_defaults (GParamSpec *pspec,
611 GValue dflt_value = { 0, };
614 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), FALSE);
615 g_return_val_if_fail (G_IS_VALUE (value), FALSE);
616 g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value), FALSE);
618 g_value_init (&dflt_value, G_PARAM_SPEC_VALUE_TYPE (pspec));
619 G_PARAM_SPEC_GET_CLASS (pspec)->value_set_default (pspec, &dflt_value);
620 defaults = G_PARAM_SPEC_GET_CLASS (pspec)->values_cmp (pspec, value, &dflt_value) == 0;
621 g_value_unset (&dflt_value);
627 * g_param_value_validate:
628 * @pspec: a valid #GParamSpec
629 * @value: a #GValue of correct type for @pspec
631 * Ensures that the contents of @value comply with the specifications
632 * set out by @pspec. For example, a #GParamSpecInt might require
633 * that integers stored in @value may not be smaller than -42 and not be
634 * greater than +42. If @value contains an integer outside of this range,
635 * it is modified accordingly, so the resulting value will fit into the
638 * Returns: whether modifying @value was necessary to ensure validity
641 g_param_value_validate (GParamSpec *pspec,
644 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), FALSE);
645 g_return_val_if_fail (G_IS_VALUE (value), FALSE);
646 g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value), FALSE);
648 if (G_PARAM_SPEC_GET_CLASS (pspec)->value_validate)
650 GValue oval = *value;
652 if (G_PARAM_SPEC_GET_CLASS (pspec)->value_validate (pspec, value) ||
653 memcmp (&oval.data, &value->data, sizeof (oval.data)))
661 * g_param_value_convert:
662 * @pspec: a valid #GParamSpec
663 * @src_value: souce #GValue
664 * @dest_value: destination #GValue of correct type for @pspec
665 * @strict_validation: %TRUE requires @dest_value to conform to @pspec
666 * without modifications
668 * Transforms @src_value into @dest_value if possible, and then
669 * validates @dest_value, in order for it to conform to @pspec. If
670 * @strict_validation is %TRUE this function will only succeed if the
671 * transformed @dest_value complied to @pspec without modifications.
673 * See also g_value_type_transformable(), g_value_transform() and
674 * g_param_value_validate().
676 * Returns: %TRUE if transformation and validation were successful,
677 * %FALSE otherwise and @dest_value is left untouched.
680 g_param_value_convert (GParamSpec *pspec,
681 const GValue *src_value,
683 gboolean strict_validation)
685 GValue tmp_value = { 0, };
687 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), FALSE);
688 g_return_val_if_fail (G_IS_VALUE (src_value), FALSE);
689 g_return_val_if_fail (G_IS_VALUE (dest_value), FALSE);
690 g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, dest_value), FALSE);
692 /* better leave dest_value untouched when returning FALSE */
694 g_value_init (&tmp_value, G_VALUE_TYPE (dest_value));
695 if (g_value_transform (src_value, &tmp_value) &&
696 (!g_param_value_validate (pspec, &tmp_value) || !strict_validation))
698 g_value_unset (dest_value);
700 /* values are relocatable */
701 memcpy (dest_value, &tmp_value, sizeof (tmp_value));
707 g_value_unset (&tmp_value);
714 * g_param_values_cmp:
715 * @pspec: a valid #GParamSpec
716 * @value1: a #GValue of correct type for @pspec
717 * @value2: a #GValue of correct type for @pspec
719 * Compares @value1 with @value2 according to @pspec, and return -1, 0 or +1,
720 * if @value1 is found to be less than, equal to or greater than @value2,
723 * Returns: -1, 0 or +1, for a less than, equal to or greater than result
726 g_param_values_cmp (GParamSpec *pspec,
727 const GValue *value1,
728 const GValue *value2)
732 /* param_values_cmp() effectively does: value1 - value2
733 * so the return values are:
734 * -1) value1 < value2
735 * 0) value1 == value2
738 g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), 0);
739 g_return_val_if_fail (G_IS_VALUE (value1), 0);
740 g_return_val_if_fail (G_IS_VALUE (value2), 0);
741 g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value1), 0);
742 g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value2), 0);
744 cmp = G_PARAM_SPEC_GET_CLASS (pspec)->values_cmp (pspec, value1, value2);
746 return CLAMP (cmp, -1, 1);
750 value_param_init (GValue *value)
752 value->data[0].v_pointer = NULL;
756 value_param_free_value (GValue *value)
758 if (value->data[0].v_pointer)
759 g_param_spec_unref (value->data[0].v_pointer);
763 value_param_copy_value (const GValue *src_value,
766 if (src_value->data[0].v_pointer)
767 dest_value->data[0].v_pointer = g_param_spec_ref (src_value->data[0].v_pointer);
769 dest_value->data[0].v_pointer = NULL;
773 value_param_transform_value (const GValue *src_value,
776 if (src_value->data[0].v_pointer &&
777 g_type_is_a (G_PARAM_SPEC_TYPE (dest_value->data[0].v_pointer), G_VALUE_TYPE (dest_value)))
778 dest_value->data[0].v_pointer = g_param_spec_ref (src_value->data[0].v_pointer);
780 dest_value->data[0].v_pointer = NULL;
784 value_param_peek_pointer (const GValue *value)
786 return value->data[0].v_pointer;
790 value_param_collect_value (GValue *value,
791 guint n_collect_values,
792 GTypeCValue *collect_values,
795 if (collect_values[0].v_pointer)
797 GParamSpec *param = collect_values[0].v_pointer;
799 if (param->g_type_instance.g_class == NULL)
800 return g_strconcat ("invalid unclassed param spec pointer for value type `",
801 G_VALUE_TYPE_NAME (value),
804 else if (!g_value_type_compatible (G_PARAM_SPEC_TYPE (param), G_VALUE_TYPE (value)))
805 return g_strconcat ("invalid param spec type `",
806 G_PARAM_SPEC_TYPE_NAME (param),
807 "' for value type `",
808 G_VALUE_TYPE_NAME (value),
811 value->data[0].v_pointer = g_param_spec_ref (param);
814 value->data[0].v_pointer = NULL;
820 value_param_lcopy_value (const GValue *value,
821 guint n_collect_values,
822 GTypeCValue *collect_values,
825 GParamSpec **param_p = collect_values[0].v_pointer;
828 return g_strdup_printf ("value location for `%s' passed as NULL", G_VALUE_TYPE_NAME (value));
830 if (!value->data[0].v_pointer)
832 else if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
833 *param_p = value->data[0].v_pointer;
835 *param_p = g_param_spec_ref (value->data[0].v_pointer);
841 /* --- param spec pool --- */
845 * A #GParamSpecPool maintains a collection of #GParamSpec<!-- -->s which can be
846 * quickly accessed by owner and name. The implementation of the #GObject property
847 * system uses such a pool to store the #GParamSpecs of the properties all object
850 struct _GParamSpecPool
853 gboolean type_prefixing;
854 GHashTable *hash_table;
858 param_spec_pool_hash (gconstpointer key_spec)
860 const GParamSpec *key = key_spec;
862 guint h = key->owner_type;
864 for (p = key->name; *p; p++)
865 h = (h << 5) - h + *p;
871 param_spec_pool_equals (gconstpointer key_spec_1,
872 gconstpointer key_spec_2)
874 const GParamSpec *key1 = key_spec_1;
875 const GParamSpec *key2 = key_spec_2;
877 return (key1->owner_type == key2->owner_type &&
878 strcmp (key1->name, key2->name) == 0);
882 * g_param_spec_pool_new:
883 * @type_prefixing: Whether the pool will support type-prefixed property names.
885 * Creates a new #GParamSpecPool.
887 * If @type_prefixing is %TRUE, lookups in the newly created pool will
888 * allow to specify the owner as a colon-separated prefix of the
889 * property name, like "GtkContainer:border-width". This feature is
890 * deprecated, so you should always set @type_prefixing to %FALSE.
892 * Returns: (transfer none): a newly allocated #GParamSpecPool.
895 g_param_spec_pool_new (gboolean type_prefixing)
897 static GStaticMutex init_smutex = G_STATIC_MUTEX_INIT;
898 GParamSpecPool *pool = g_new (GParamSpecPool, 1);
900 memcpy (&pool->smutex, &init_smutex, sizeof (init_smutex));
901 pool->type_prefixing = type_prefixing != FALSE;
902 pool->hash_table = g_hash_table_new (param_spec_pool_hash, param_spec_pool_equals);
908 * g_param_spec_pool_insert:
909 * @pool: a #GParamSpecPool.
910 * @pspec: the #GParamSpec to insert
911 * @owner_type: a #GType identifying the owner of @pspec
913 * Inserts a #GParamSpec in the pool.
916 g_param_spec_pool_insert (GParamSpecPool *pool,
922 if (pool && pspec && owner_type > 0 && pspec->owner_type == 0)
924 for (p = pspec->name; *p; p++)
926 if (!strchr (G_CSET_A_2_Z G_CSET_a_2_z G_CSET_DIGITS "-_", *p))
928 g_warning (G_STRLOC ": pspec name \"%s\" contains invalid characters", pspec->name);
932 G_SLOCK (&pool->smutex);
933 pspec->owner_type = owner_type;
934 g_param_spec_ref (pspec);
935 g_hash_table_insert (pool->hash_table, pspec, pspec);
936 G_SUNLOCK (&pool->smutex);
940 g_return_if_fail (pool != NULL);
941 g_return_if_fail (pspec);
942 g_return_if_fail (owner_type > 0);
943 g_return_if_fail (pspec->owner_type == 0);
948 * g_param_spec_pool_remove:
949 * @pool: a #GParamSpecPool
950 * @pspec: the #GParamSpec to remove
952 * Removes a #GParamSpec from the pool.
955 g_param_spec_pool_remove (GParamSpecPool *pool,
960 G_SLOCK (&pool->smutex);
961 if (g_hash_table_remove (pool->hash_table, pspec))
962 g_param_spec_unref (pspec);
964 g_warning (G_STRLOC ": attempt to remove unknown pspec `%s' from pool", pspec->name);
965 G_SUNLOCK (&pool->smutex);
969 g_return_if_fail (pool != NULL);
970 g_return_if_fail (pspec);
974 static inline GParamSpec*
975 param_spec_ht_lookup (GHashTable *hash_table,
976 const gchar *param_name,
978 gboolean walk_ancestors)
980 GParamSpec key, *pspec;
982 key.owner_type = owner_type;
983 key.name = (gchar*) param_name;
987 pspec = g_hash_table_lookup (hash_table, &key);
990 key.owner_type = g_type_parent (key.owner_type);
992 while (key.owner_type);
994 pspec = g_hash_table_lookup (hash_table, &key);
996 if (!pspec && !is_canonical (param_name))
998 /* try canonicalized form */
999 key.name = g_strdup (param_name);
1000 key.owner_type = owner_type;
1002 canonicalize_key (key.name);
1006 pspec = g_hash_table_lookup (hash_table, &key);
1012 key.owner_type = g_type_parent (key.owner_type);
1014 while (key.owner_type);
1016 pspec = g_hash_table_lookup (hash_table, &key);
1024 * g_param_spec_pool_lookup:
1025 * @pool: a #GParamSpecPool
1026 * @param_name: the name to look for
1027 * @owner_type: the owner to look for
1028 * @walk_ancestors: If %TRUE, also try to find a #GParamSpec with @param_name
1029 * owned by an ancestor of @owner_type.
1031 * Looks up a #GParamSpec in the pool.
1033 * Returns: (transfer none): The found #GParamSpec, or %NULL if no
1034 * matching #GParamSpec was found.
1037 g_param_spec_pool_lookup (GParamSpecPool *pool,
1038 const gchar *param_name,
1040 gboolean walk_ancestors)
1045 if (!pool || !param_name)
1047 g_return_val_if_fail (pool != NULL, NULL);
1048 g_return_val_if_fail (param_name != NULL, NULL);
1051 G_SLOCK (&pool->smutex);
1053 delim = pool->type_prefixing ? strchr (param_name, ':') : NULL;
1055 /* try quick and away, i.e. without prefix */
1058 pspec = param_spec_ht_lookup (pool->hash_table, param_name, owner_type, walk_ancestors);
1059 G_SUNLOCK (&pool->smutex);
1064 /* strip type prefix */
1065 if (pool->type_prefixing && delim[1] == ':')
1067 guint l = delim - param_name;
1068 gchar stack_buffer[32], *buffer = l < 32 ? stack_buffer : g_new (gchar, l + 1);
1071 strncpy (buffer, param_name, delim - param_name);
1073 type = g_type_from_name (buffer);
1076 if (type) /* type==0 isn't a valid type pefix */
1078 /* sanity check, these cases don't make a whole lot of sense */
1079 if ((!walk_ancestors && type != owner_type) || !g_type_is_a (owner_type, type))
1081 G_SUNLOCK (&pool->smutex);
1086 param_name += l + 2;
1087 pspec = param_spec_ht_lookup (pool->hash_table, param_name, owner_type, walk_ancestors);
1088 G_SUNLOCK (&pool->smutex);
1093 /* malformed param_name */
1095 G_SUNLOCK (&pool->smutex);
1101 pool_list (gpointer key,
1105 GParamSpec *pspec = value;
1106 gpointer *data = user_data;
1107 GType owner_type = (GType) data[1];
1109 if (owner_type == pspec->owner_type)
1110 data[0] = g_list_prepend (data[0], pspec);
1114 * g_param_spec_pool_list_owned:
1115 * @pool: a #GParamSpecPool
1116 * @owner_type: the owner to look for
1118 * Gets an #GList of all #GParamSpec<!-- -->s owned by @owner_type in
1121 * Returns: (transfer container) (element-type GObject.ParamSpec): a
1122 * #GList of all #GParamSpec<!-- -->s owned by @owner_type in
1123 * the pool#GParamSpec<!-- -->s.
1126 g_param_spec_pool_list_owned (GParamSpecPool *pool,
1131 g_return_val_if_fail (pool != NULL, NULL);
1132 g_return_val_if_fail (owner_type > 0, NULL);
1134 G_SLOCK (&pool->smutex);
1136 data[1] = (gpointer) owner_type;
1137 g_hash_table_foreach (pool->hash_table, pool_list, &data);
1138 G_SUNLOCK (&pool->smutex);
1144 pspec_compare_id (gconstpointer a,
1147 const GParamSpec *pspec1 = a, *pspec2 = b;
1149 if (pspec1->param_id < pspec2->param_id)
1152 if (pspec1->param_id > pspec2->param_id)
1155 return strcmp (pspec1->name, pspec2->name);
1158 static inline GSList*
1159 pspec_list_remove_overridden_and_redirected (GSList *plist,
1164 GSList *rlist = NULL;
1168 GSList *tmp = plist->next;
1169 GParamSpec *pspec = plist->data;
1171 gboolean remove = FALSE;
1173 /* Remove paramspecs that are redirected, and also paramspecs
1174 * that have are overridden by non-redirected properties.
1175 * The idea is to get the single paramspec for each name that
1176 * best corresponds to what the application sees.
1178 if (g_param_spec_get_redirect_target (pspec))
1182 found = param_spec_ht_lookup (ht, pspec->name, owner_type, TRUE);
1185 GParamSpec *redirect = g_param_spec_get_redirect_target (found);
1186 if (redirect != pspec)
1193 g_slist_free_1 (plist);
1197 plist->next = rlist;
1207 pool_depth_list (gpointer key,
1211 GParamSpec *pspec = value;
1212 gpointer *data = user_data;
1213 GSList **slists = data[0];
1214 GType owner_type = (GType) data[1];
1216 if (g_type_is_a (owner_type, pspec->owner_type))
1218 if (G_TYPE_IS_INTERFACE (pspec->owner_type))
1220 slists[0] = g_slist_prepend (slists[0], pspec);
1224 guint d = g_type_depth (pspec->owner_type);
1226 slists[d - 1] = g_slist_prepend (slists[d - 1], pspec);
1231 /* We handle interfaces specially since we don't want to
1232 * count interface prerequisites like normal inheritance;
1233 * the property comes from the direct inheritance from
1234 * the prerequisite class, not from the interface that
1237 * also 'depth' isn't a meaningful concept for interface
1241 pool_depth_list_for_interface (gpointer key,
1245 GParamSpec *pspec = value;
1246 gpointer *data = user_data;
1247 GSList **slists = data[0];
1248 GType owner_type = (GType) data[1];
1250 if (pspec->owner_type == owner_type)
1251 slists[0] = g_slist_prepend (slists[0], pspec);
1255 * g_param_spec_pool_list:
1256 * @pool: a #GParamSpecPool
1257 * @owner_type: the owner to look for
1258 * @n_pspecs_p: (out): return location for the length of the returned array
1260 * Gets an array of all #GParamSpec<!-- -->s owned by @owner_type in
1263 * Returns: (array length=n_pspecs_p) (transfer container): a newly
1264 * allocated array containing pointers to all #GParamSpecs
1265 * owned by @owner_type in the pool
1268 g_param_spec_pool_list (GParamSpecPool *pool,
1272 GParamSpec **pspecs, **p;
1273 GSList **slists, *node;
1277 g_return_val_if_fail (pool != NULL, NULL);
1278 g_return_val_if_fail (owner_type > 0, NULL);
1279 g_return_val_if_fail (n_pspecs_p != NULL, NULL);
1281 G_SLOCK (&pool->smutex);
1283 d = g_type_depth (owner_type);
1284 slists = g_new0 (GSList*, d);
1286 data[1] = (gpointer) owner_type;
1288 g_hash_table_foreach (pool->hash_table,
1289 G_TYPE_IS_INTERFACE (owner_type) ?
1290 pool_depth_list_for_interface :
1294 for (i = 0; i < d; i++)
1295 slists[i] = pspec_list_remove_overridden_and_redirected (slists[i], pool->hash_table, owner_type, n_pspecs_p);
1296 pspecs = g_new (GParamSpec*, *n_pspecs_p + 1);
1298 for (i = 0; i < d; i++)
1300 slists[i] = g_slist_sort (slists[i], pspec_compare_id);
1301 for (node = slists[i]; node; node = node->next)
1303 g_slist_free (slists[i]);
1307 G_SUNLOCK (&pool->smutex);
1313 /* --- auxillary functions --- */
1318 void (*finalize) (GParamSpec *pspec);
1319 void (*value_set_default) (GParamSpec *pspec,
1321 gboolean (*value_validate) (GParamSpec *pspec,
1323 gint (*values_cmp) (GParamSpec *pspec,
1324 const GValue *value1,
1325 const GValue *value2);
1326 } ParamSpecClassInfo;
1329 param_spec_generic_class_init (gpointer g_class,
1330 gpointer class_data)
1332 GParamSpecClass *class = g_class;
1333 ParamSpecClassInfo *info = class_data;
1335 class->value_type = info->value_type;
1337 class->finalize = info->finalize; /* optional */
1338 class->value_set_default = info->value_set_default;
1339 if (info->value_validate)
1340 class->value_validate = info->value_validate; /* optional */
1341 class->values_cmp = info->values_cmp;
1342 g_free (class_data);
1346 default_value_set_default (GParamSpec *pspec,
1349 /* value is already zero initialized */
1353 default_values_cmp (GParamSpec *pspec,
1354 const GValue *value1,
1355 const GValue *value2)
1357 return memcmp (&value1->data, &value2->data, sizeof (value1->data));
1361 * g_param_type_register_static:
1362 * @name: 0-terminated string used as the name of the new #GParamSpec type.
1363 * @pspec_info: The #GParamSpecTypeInfo for this #GParamSpec type.
1365 * Registers @name as the name of a new static type derived from
1366 * #G_TYPE_PARAM. The type system uses the information contained in
1367 * the #GParamSpecTypeInfo structure pointed to by @info to manage the
1368 * #GParamSpec type and its instances.
1370 * Returns: The new type identifier.
1373 g_param_type_register_static (const gchar *name,
1374 const GParamSpecTypeInfo *pspec_info)
1377 sizeof (GParamSpecClass), /* class_size */
1378 NULL, /* base_init */
1379 NULL, /* base_destroy */
1380 param_spec_generic_class_init, /* class_init */
1381 NULL, /* class_destroy */
1382 NULL, /* class_data */
1383 0, /* instance_size */
1384 16, /* n_preallocs */
1385 NULL, /* instance_init */
1387 ParamSpecClassInfo *cinfo;
1389 g_return_val_if_fail (name != NULL, 0);
1390 g_return_val_if_fail (pspec_info != NULL, 0);
1391 g_return_val_if_fail (g_type_from_name (name) == 0, 0);
1392 g_return_val_if_fail (pspec_info->instance_size >= sizeof (GParamSpec), 0);
1393 g_return_val_if_fail (g_type_name (pspec_info->value_type) != NULL, 0);
1394 /* default: g_return_val_if_fail (pspec_info->value_set_default != NULL, 0); */
1395 /* optional: g_return_val_if_fail (pspec_info->value_validate != NULL, 0); */
1396 /* default: g_return_val_if_fail (pspec_info->values_cmp != NULL, 0); */
1398 info.instance_size = pspec_info->instance_size;
1399 info.n_preallocs = pspec_info->n_preallocs;
1400 info.instance_init = (GInstanceInitFunc) pspec_info->instance_init;
1401 cinfo = g_new (ParamSpecClassInfo, 1);
1402 cinfo->value_type = pspec_info->value_type;
1403 cinfo->finalize = pspec_info->finalize;
1404 cinfo->value_set_default = pspec_info->value_set_default ? pspec_info->value_set_default : default_value_set_default;
1405 cinfo->value_validate = pspec_info->value_validate;
1406 cinfo->values_cmp = pspec_info->values_cmp ? pspec_info->values_cmp : default_values_cmp;
1407 info.class_data = cinfo;
1409 return g_type_register_static (G_TYPE_PARAM, name, &info, 0);
1413 * g_value_set_param:
1414 * @value: a valid #GValue of type %G_TYPE_PARAM
1415 * @param: the #GParamSpec to be set
1417 * Set the contents of a %G_TYPE_PARAM #GValue to @param.
1420 g_value_set_param (GValue *value,
1423 g_return_if_fail (G_VALUE_HOLDS_PARAM (value));
1425 g_return_if_fail (G_IS_PARAM_SPEC (param));
1427 if (value->data[0].v_pointer)
1428 g_param_spec_unref (value->data[0].v_pointer);
1429 value->data[0].v_pointer = param;
1430 if (value->data[0].v_pointer)
1431 g_param_spec_ref (value->data[0].v_pointer);
1435 * g_value_set_param_take_ownership: (skip)
1436 * @value: a valid #GValue of type %G_TYPE_PARAM
1437 * @param: the #GParamSpec to be set
1439 * This is an internal function introduced mainly for C marshallers.
1441 * Deprecated: 2.4: Use g_value_take_param() instead.
1444 g_value_set_param_take_ownership (GValue *value,
1447 g_value_take_param (value, param);
1451 * g_value_take_param: (skip)
1452 * @value: a valid #GValue of type %G_TYPE_PARAM
1453 * @param: the #GParamSpec to be set
1455 * Sets the contents of a %G_TYPE_PARAM #GValue to @param and takes
1456 * over the ownership of the callers reference to @param; the caller
1457 * doesn't have to unref it any more.
1462 g_value_take_param (GValue *value,
1465 g_return_if_fail (G_VALUE_HOLDS_PARAM (value));
1467 g_return_if_fail (G_IS_PARAM_SPEC (param));
1469 if (value->data[0].v_pointer)
1470 g_param_spec_unref (value->data[0].v_pointer);
1471 value->data[0].v_pointer = param; /* we take over the reference count */
1475 * g_value_get_param:
1476 * @value: a valid #GValue whose type is derived from %G_TYPE_PARAM
1478 * Get the contents of a %G_TYPE_PARAM #GValue.
1480 * Returns: (transfer none): #GParamSpec content of @value
1483 g_value_get_param (const GValue *value)
1485 g_return_val_if_fail (G_VALUE_HOLDS_PARAM (value), NULL);
1487 return value->data[0].v_pointer;
1491 * g_value_dup_param: (skip)
1492 * @value: a valid #GValue whose type is derived from %G_TYPE_PARAM
1494 * Get the contents of a %G_TYPE_PARAM #GValue, increasing its
1497 * Returns: #GParamSpec content of @value, should be unreferenced when
1501 g_value_dup_param (const GValue *value)
1503 g_return_val_if_fail (G_VALUE_HOLDS_PARAM (value), NULL);
1505 return value->data[0].v_pointer ? g_param_spec_ref (value->data[0].v_pointer) : NULL;