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gparam.c
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gparam.c
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/* GObject - GLib Type, Object, Parameter and Signal Library
* Copyright (C) 1997-1999, 2000-2001 Tim Janik and Red Hat, Inc.
*
* 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 License, 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.
*/
/*
* MT safe
*/
#include "config.h"
#include <string.h>
#include "gparam.h"
#include "gparamspecs.h"
#include "gvaluecollector.h"
#include "gobjectalias.h"
/**
* SECTION:gparamspec
* @short_description: Metadata for parameter specifications
* @see_also: g_object_class_install_property(), g_object_set(),
* g_object_get(), g_object_set_property(), g_object_get_property(),
* g_value_register_transform_func()
* @title: GParamSpec
*
* #GParamSpec is an object structure that encapsulates the metadata
* required to specify parameters, such as e.g. #GObject properties.
*
* <para id="canonical-parameter-name">
* Parameter names need to start with a letter (a-z or A-Z). Subsequent
* characters can be letters, numbers or a '-'.
* All other characters are replaced by a '-' during construction.
* The result of this replacement is called the canonical name of the
* parameter.
* </para>
*/
/* --- defines --- */
#define PARAM_FLOATING_FLAG 0x2
#define G_PARAM_USER_MASK (~0 << G_PARAM_USER_SHIFT)
#define PSPEC_APPLIES_TO_VALUE(pspec, value) (G_TYPE_CHECK_VALUE_TYPE ((value), G_PARAM_SPEC_VALUE_TYPE (pspec)))
#define G_SLOCK(mutex) g_static_mutex_lock (mutex)
#define G_SUNLOCK(mutex) g_static_mutex_unlock (mutex)
/* --- prototypes --- */
static void g_param_spec_class_base_init (GParamSpecClass *class);
static void g_param_spec_class_base_finalize (GParamSpecClass *class);
static void g_param_spec_class_init (GParamSpecClass *class,
gpointer class_data);
static void g_param_spec_init (GParamSpec *pspec,
GParamSpecClass *class);
static void g_param_spec_finalize (GParamSpec *pspec);
static void value_param_init (GValue *value);
static void value_param_free_value (GValue *value);
static void value_param_copy_value (const GValue *src_value,
GValue *dest_value);
static void value_param_transform_value (const GValue *src_value,
GValue *dest_value);
static gpointer value_param_peek_pointer (const GValue *value);
static gchar* value_param_collect_value (GValue *value,
guint n_collect_values,
GTypeCValue *collect_values,
guint collect_flags);
static gchar* value_param_lcopy_value (const GValue *value,
guint n_collect_values,
GTypeCValue *collect_values,
guint collect_flags);
/* --- functions --- */
void
g_param_type_init (void)
{
static const GTypeFundamentalInfo finfo = {
(G_TYPE_FLAG_CLASSED |
G_TYPE_FLAG_INSTANTIATABLE |
G_TYPE_FLAG_DERIVABLE |
G_TYPE_FLAG_DEEP_DERIVABLE),
};
static const GTypeValueTable param_value_table = {
value_param_init, /* value_init */
value_param_free_value, /* value_free */
value_param_copy_value, /* value_copy */
value_param_peek_pointer, /* value_peek_pointer */
"p", /* collect_format */
value_param_collect_value, /* collect_value */
"p", /* lcopy_format */
value_param_lcopy_value, /* lcopy_value */
};
static const GTypeInfo param_spec_info = {
sizeof (GParamSpecClass),
(GBaseInitFunc) g_param_spec_class_base_init,
(GBaseFinalizeFunc) g_param_spec_class_base_finalize,
(GClassInitFunc) g_param_spec_class_init,
(GClassFinalizeFunc) NULL,
NULL, /* class_data */
sizeof (GParamSpec),
0, /* n_preallocs */
(GInstanceInitFunc) g_param_spec_init,
¶m_value_table,
};
GType type;
/* This should be registred as GParamSpec instead of GParam, for
* consistency sake, so that type name can be mapped to struct name,
* However, some language bindings, most noticable the python ones
* depends on the "GParam" identifier, see #548689
*/
type = g_type_register_fundamental (G_TYPE_PARAM, g_intern_static_string ("GParam"), ¶m_spec_info, &finfo, G_TYPE_FLAG_ABSTRACT);
g_assert (type == G_TYPE_PARAM);
g_value_register_transform_func (G_TYPE_PARAM, G_TYPE_PARAM, value_param_transform_value);
}
static void
g_param_spec_class_base_init (GParamSpecClass *class)
{
}
static void
g_param_spec_class_base_finalize (GParamSpecClass *class)
{
}
static void
g_param_spec_class_init (GParamSpecClass *class,
gpointer class_data)
{
class->value_type = G_TYPE_NONE;
class->finalize = g_param_spec_finalize;
class->value_set_default = NULL;
class->value_validate = NULL;
class->values_cmp = NULL;
}
static void
g_param_spec_init (GParamSpec *pspec,
GParamSpecClass *class)
{
pspec->name = NULL;
pspec->_nick = NULL;
pspec->_blurb = NULL;
pspec->flags = 0;
pspec->value_type = class->value_type;
pspec->owner_type = 0;
pspec->qdata = NULL;
g_datalist_init (&pspec->qdata);
g_datalist_set_flags (&pspec->qdata, PARAM_FLOATING_FLAG);
pspec->ref_count = 1;
pspec->param_id = 0;
}
static void
g_param_spec_finalize (GParamSpec *pspec)
{
g_datalist_clear (&pspec->qdata);
if (!(pspec->flags & G_PARAM_STATIC_NAME))
g_free (pspec->name);
if (!(pspec->flags & G_PARAM_STATIC_NICK))
g_free (pspec->_nick);
if (!(pspec->flags & G_PARAM_STATIC_BLURB))
g_free (pspec->_blurb);
g_type_free_instance ((GTypeInstance*) pspec);
}
/**
* g_param_spec_ref:
* @pspec: a valid #GParamSpec
*
* Increments the reference count of @pspec.
*
* Returns: the #GParamSpec that was passed into this function
*/
GParamSpec*
g_param_spec_ref (GParamSpec *pspec)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
g_return_val_if_fail (pspec->ref_count > 0, NULL);
g_atomic_int_inc ((int *)&pspec->ref_count);
return pspec;
}
/**
* g_param_spec_unref:
* @pspec: a valid #GParamSpec
*
* Decrements the reference count of a @pspec.
*/
void
g_param_spec_unref (GParamSpec *pspec)
{
gboolean is_zero;
g_return_if_fail (G_IS_PARAM_SPEC (pspec));
g_return_if_fail (pspec->ref_count > 0);
is_zero = g_atomic_int_dec_and_test ((int *)&pspec->ref_count);
if (G_UNLIKELY (is_zero))
{
G_PARAM_SPEC_GET_CLASS (pspec)->finalize (pspec);
}
}
/**
* g_param_spec_sink:
* @pspec: a valid #GParamSpec
*
* The initial reference count of a newly created #GParamSpec is 1,
* even though no one has explicitly called g_param_spec_ref() on it
* yet. So the initial reference count is flagged as "floating", until
* someone calls <literal>g_param_spec_ref (pspec); g_param_spec_sink
* (pspec);</literal> in sequence on it, taking over the initial
* reference count (thus ending up with a @pspec that has a reference
* count of 1 still, but is not flagged "floating" anymore).
*/
void
g_param_spec_sink (GParamSpec *pspec)
{
gpointer oldvalue;
g_return_if_fail (G_IS_PARAM_SPEC (pspec));
g_return_if_fail (pspec->ref_count > 0);
do
oldvalue = g_atomic_pointer_get (&pspec->qdata);
while (!g_atomic_pointer_compare_and_exchange ((void**) &pspec->qdata, oldvalue,
(gpointer) ((gsize) oldvalue & ~(gsize) PARAM_FLOATING_FLAG)));
if ((gsize) oldvalue & PARAM_FLOATING_FLAG)
g_param_spec_unref (pspec);
}
/**
* g_param_spec_ref_sink:
* @pspec: a valid #GParamSpec
*
* Convenience function to ref and sink a #GParamSpec.
*
* Since: 2.10
* Returns: the #GParamSpec that was passed into this function
*/
GParamSpec*
g_param_spec_ref_sink (GParamSpec *pspec)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
g_return_val_if_fail (pspec->ref_count > 0, NULL);
g_param_spec_ref (pspec);
g_param_spec_sink (pspec);
return pspec;
}
/**
* g_param_spec_get_name:
* @pspec: a valid #GParamSpec
*
* Get the name of a #GParamSpec.
*
* Returns: the name of @pspec.
*/
G_CONST_RETURN gchar*
g_param_spec_get_name (GParamSpec *pspec)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
return pspec->name;
}
/**
* g_param_spec_get_nick:
* @pspec: a valid #GParamSpec
*
* Get the nickname of a #GParamSpec.
*
* Returns: the nickname of @pspec.
*/
G_CONST_RETURN gchar*
g_param_spec_get_nick (GParamSpec *pspec)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
if (pspec->_nick)
return pspec->_nick;
else
{
GParamSpec *redirect_target;
redirect_target = g_param_spec_get_redirect_target (pspec);
if (redirect_target && redirect_target->_nick)
return redirect_target->_nick;
}
return pspec->name;
}
/**
* g_param_spec_get_blurb:
* @pspec: a valid #GParamSpec
*
* Get the short description of a #GParamSpec.
*
* Returns: the short description of @pspec.
*/
G_CONST_RETURN gchar*
g_param_spec_get_blurb (GParamSpec *pspec)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
if (pspec->_blurb)
return pspec->_blurb;
else
{
GParamSpec *redirect_target;
redirect_target = g_param_spec_get_redirect_target (pspec);
if (redirect_target && redirect_target->_blurb)
return redirect_target->_blurb;
}
return NULL;
}
static void
canonicalize_key (gchar *key)
{
gchar *p;
for (p = key; *p != 0; p++)
{
gchar c = *p;
if (c != '-' &&
(c < '0' || c > '9') &&
(c < 'A' || c > 'Z') &&
(c < 'a' || c > 'z'))
*p = '-';
}
}
static gboolean
is_canonical (const gchar *key)
{
const gchar *p;
for (p = key; *p != 0; p++)
{
gchar c = *p;
if (c != '-' &&
(c < '0' || c > '9') &&
(c < 'A' || c > 'Z') &&
(c < 'a' || c > 'z'))
return FALSE;
}
return TRUE;
}
/**
* g_param_spec_internal:
* @param_type: the #GType for the property; must be derived from #G_TYPE_PARAM
* @name: the canonical name of the property
* @nick: the nickname of the property
* @blurb: a short description of the property
* @flags: a combination of #GParamFlags
*
* Creates a new #GParamSpec instance.
*
* A property name consists of segments consisting of ASCII letters and
* digits, separated by either the '-' or '_' character. The first
* character of a property name must be a letter. Names which violate these
* rules lead to undefined behaviour.
*
* When creating and looking up a #GParamSpec, either separator can be
* used, but they cannot be mixed. Using '-' is considerably more
* efficient and in fact required when using property names as detail
* strings for signals.
*
* Beyond the name, #GParamSpec<!-- -->s have two more descriptive
* strings associated with them, the @nick, which should be suitable
* for use as a label for the property in a property editor, and the
* @blurb, which should be a somewhat longer description, suitable for
* e.g. a tooltip. The @nick and @blurb should ideally be localized.
*
* Returns: a newly allocated #GParamSpec instance
*/
gpointer
g_param_spec_internal (GType param_type,
const gchar *name,
const gchar *nick,
const gchar *blurb,
GParamFlags flags)
{
GParamSpec *pspec;
g_return_val_if_fail (G_TYPE_IS_PARAM (param_type) && param_type != G_TYPE_PARAM, NULL);
g_return_val_if_fail (name != NULL, NULL);
g_return_val_if_fail ((name[0] >= 'A' && name[0] <= 'Z') || (name[0] >= 'a' && name[0] <= 'z'), NULL);
g_return_val_if_fail (!(flags & G_PARAM_STATIC_NAME) || is_canonical (name), NULL);
pspec = (gpointer) g_type_create_instance (param_type);
if (flags & G_PARAM_STATIC_NAME)
{
pspec->name = g_intern_static_string (name);
if (!is_canonical (pspec->name))
g_warning ("G_PARAM_STATIC_NAME used with non-canonical pspec name: %s", pspec->name);
}
else
{
pspec->name = g_strdup (name);
canonicalize_key (pspec->name);
g_intern_string (pspec->name);
}
if (flags & G_PARAM_STATIC_NICK)
pspec->_nick = (gchar*) nick;
else
pspec->_nick = g_strdup (nick);
if (flags & G_PARAM_STATIC_BLURB)
pspec->_blurb = (gchar*) blurb;
else
pspec->_blurb = g_strdup (blurb);
pspec->flags = (flags & G_PARAM_USER_MASK) | (flags & G_PARAM_MASK);
return pspec;
}
/**
* g_param_spec_get_qdata:
* @pspec: a valid #GParamSpec
* @quark: a #GQuark, naming the user data pointer
*
* Gets back user data pointers stored via g_param_spec_set_qdata().
*
* Returns: the user data pointer set, or %NULL
*/
gpointer
g_param_spec_get_qdata (GParamSpec *pspec,
GQuark quark)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
return quark ? g_datalist_id_get_data (&pspec->qdata, quark) : NULL;
}
/**
* g_param_spec_set_qdata:
* @pspec: the #GParamSpec to set store a user data pointer
* @quark: a #GQuark, naming the user data pointer
* @data: an opaque user data pointer
*
* Sets an opaque, named pointer on a #GParamSpec. The name is
* specified through a #GQuark (retrieved e.g. via
* g_quark_from_static_string()), and the pointer can be gotten back
* from the @pspec with g_param_spec_get_qdata(). Setting a
* previously set user data pointer, overrides (frees) the old pointer
* set, using %NULL as pointer essentially removes the data stored.
*/
void
g_param_spec_set_qdata (GParamSpec *pspec,
GQuark quark,
gpointer data)
{
g_return_if_fail (G_IS_PARAM_SPEC (pspec));
g_return_if_fail (quark > 0);
g_datalist_id_set_data (&pspec->qdata, quark, data);
}
/**
* g_param_spec_set_qdata_full:
* @pspec: the #GParamSpec to set store a user data pointer
* @quark: a #GQuark, naming the user data pointer
* @data: an opaque user data pointer
* @destroy: function to invoke with @data as argument, when @data needs to
* be freed
*
* This function works like g_param_spec_set_qdata(), but in addition,
* a <literal>void (*destroy) (gpointer)</literal> function may be
* specified which is called with @data as argument when the @pspec is
* finalized, or the data is being overwritten by a call to
* g_param_spec_set_qdata() with the same @quark.
*/
void
g_param_spec_set_qdata_full (GParamSpec *pspec,
GQuark quark,
gpointer data,
GDestroyNotify destroy)
{
g_return_if_fail (G_IS_PARAM_SPEC (pspec));
g_return_if_fail (quark > 0);
g_datalist_id_set_data_full (&pspec->qdata, quark, data, data ? destroy : (GDestroyNotify) NULL);
}
/**
* g_param_spec_steal_qdata:
* @pspec: the #GParamSpec to get a stored user data pointer from
* @quark: a #GQuark, naming the user data pointer
*
* Gets back user data pointers stored via g_param_spec_set_qdata()
* and removes the @data from @pspec without invoking its destroy()
* function (if any was set). Usually, calling this function is only
* required to update user data pointers with a destroy notifier.
*
* Returns: the user data pointer set, or %NULL
*/
gpointer
g_param_spec_steal_qdata (GParamSpec *pspec,
GQuark quark)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
g_return_val_if_fail (quark > 0, NULL);
return g_datalist_id_remove_no_notify (&pspec->qdata, quark);
}
/**
* g_param_spec_get_redirect_target:
* @pspec: a #GParamSpec
*
* If the paramspec redirects operations to another paramspec,
* returns that paramspec. Redirect is used typically for
* providing a new implementation of a property in a derived
* type while preserving all the properties from the parent
* type. Redirection is established by creating a property
* of type #GParamSpecOverride. See g_object_class_override_property()
* for an example of the use of this capability.
*
* Since: 2.4
*
* Returns: paramspec to which requests on this paramspec should
* be redirected, or %NULL if none.
*/
GParamSpec*
g_param_spec_get_redirect_target (GParamSpec *pspec)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), NULL);
if (G_IS_PARAM_SPEC_OVERRIDE (pspec))
{
GParamSpecOverride *ospec = G_PARAM_SPEC_OVERRIDE (pspec);
return ospec->overridden;
}
else
return NULL;
}
/**
* g_param_value_set_default:
* @pspec: a valid #GParamSpec
* @value: a #GValue of correct type for @pspec
*
* Sets @value to its default value as specified in @pspec.
*/
void
g_param_value_set_default (GParamSpec *pspec,
GValue *value)
{
g_return_if_fail (G_IS_PARAM_SPEC (pspec));
g_return_if_fail (G_IS_VALUE (value));
g_return_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value));
g_value_reset (value);
G_PARAM_SPEC_GET_CLASS (pspec)->value_set_default (pspec, value);
}
/**
* g_param_value_defaults:
* @pspec: a valid #GParamSpec
* @value: a #GValue of correct type for @pspec
*
* Checks whether @value contains the default value as specified in @pspec.
*
* Returns: whether @value contains the canonical default for this @pspec
*/
gboolean
g_param_value_defaults (GParamSpec *pspec,
GValue *value)
{
GValue dflt_value = { 0, };
gboolean defaults;
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), FALSE);
g_return_val_if_fail (G_IS_VALUE (value), FALSE);
g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value), FALSE);
g_value_init (&dflt_value, G_PARAM_SPEC_VALUE_TYPE (pspec));
G_PARAM_SPEC_GET_CLASS (pspec)->value_set_default (pspec, &dflt_value);
defaults = G_PARAM_SPEC_GET_CLASS (pspec)->values_cmp (pspec, value, &dflt_value) == 0;
g_value_unset (&dflt_value);
return defaults;
}
/**
* g_param_value_validate:
* @pspec: a valid #GParamSpec
* @value: a #GValue of correct type for @pspec
*
* Ensures that the contents of @value comply with the specifications
* set out by @pspec. For example, a #GParamSpecInt might require
* that integers stored in @value may not be smaller than -42 and not be
* greater than +42. If @value contains an integer outside of this range,
* it is modified accordingly, so the resulting value will fit into the
* range -42 .. +42.
*
* Returns: whether modifying @value was necessary to ensure validity
*/
gboolean
g_param_value_validate (GParamSpec *pspec,
GValue *value)
{
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), FALSE);
g_return_val_if_fail (G_IS_VALUE (value), FALSE);
g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value), FALSE);
if (G_PARAM_SPEC_GET_CLASS (pspec)->value_validate)
{
GValue oval = *value;
if (G_PARAM_SPEC_GET_CLASS (pspec)->value_validate (pspec, value) ||
memcmp (&oval.data, &value->data, sizeof (oval.data)))
return TRUE;
}
return FALSE;
}
/**
* g_param_value_convert:
* @pspec: a valid #GParamSpec
* @src_value: souce #GValue
* @dest_value: destination #GValue of correct type for @pspec
* @strict_validation: %TRUE requires @dest_value to conform to @pspec
* without modifications
*
* Transforms @src_value into @dest_value if possible, and then
* validates @dest_value, in order for it to conform to @pspec. If
* @strict_validation is %TRUE this function will only succeed if the
* transformed @dest_value complied to @pspec without modifications.
*
* See also g_value_type_transformable(), g_value_transform() and
* g_param_value_validate().
*
* Returns: %TRUE if transformation and validation were successful,
* %FALSE otherwise and @dest_value is left untouched.
*/
gboolean
g_param_value_convert (GParamSpec *pspec,
const GValue *src_value,
GValue *dest_value,
gboolean strict_validation)
{
GValue tmp_value = { 0, };
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), FALSE);
g_return_val_if_fail (G_IS_VALUE (src_value), FALSE);
g_return_val_if_fail (G_IS_VALUE (dest_value), FALSE);
g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, dest_value), FALSE);
/* better leave dest_value untouched when returning FALSE */
g_value_init (&tmp_value, G_VALUE_TYPE (dest_value));
if (g_value_transform (src_value, &tmp_value) &&
(!g_param_value_validate (pspec, &tmp_value) || !strict_validation))
{
g_value_unset (dest_value);
/* values are relocatable */
memcpy (dest_value, &tmp_value, sizeof (tmp_value));
return TRUE;
}
else
{
g_value_unset (&tmp_value);
return FALSE;
}
}
/**
* g_param_values_cmp:
* @pspec: a valid #GParamSpec
* @value1: a #GValue of correct type for @pspec
* @value2: a #GValue of correct type for @pspec
*
* Compares @value1 with @value2 according to @pspec, and return -1, 0 or +1,
* if @value1 is found to be less than, equal to or greater than @value2,
* respectively.
*
* Returns: -1, 0 or +1, for a less than, equal to or greater than result
*/
gint
g_param_values_cmp (GParamSpec *pspec,
const GValue *value1,
const GValue *value2)
{
gint cmp;
/* param_values_cmp() effectively does: value1 - value2
* so the return values are:
* -1) value1 < value2
* 0) value1 == value2
* 1) value1 > value2
*/
g_return_val_if_fail (G_IS_PARAM_SPEC (pspec), 0);
g_return_val_if_fail (G_IS_VALUE (value1), 0);
g_return_val_if_fail (G_IS_VALUE (value2), 0);
g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value1), 0);
g_return_val_if_fail (PSPEC_APPLIES_TO_VALUE (pspec, value2), 0);
cmp = G_PARAM_SPEC_GET_CLASS (pspec)->values_cmp (pspec, value1, value2);
return CLAMP (cmp, -1, 1);
}
static void
value_param_init (GValue *value)
{
value->data[0].v_pointer = NULL;
}
static void
value_param_free_value (GValue *value)
{
if (value->data[0].v_pointer)
g_param_spec_unref (value->data[0].v_pointer);
}
static void
value_param_copy_value (const GValue *src_value,
GValue *dest_value)
{
if (src_value->data[0].v_pointer)
dest_value->data[0].v_pointer = g_param_spec_ref (src_value->data[0].v_pointer);
else
dest_value->data[0].v_pointer = NULL;
}
static void
value_param_transform_value (const GValue *src_value,
GValue *dest_value)
{
if (src_value->data[0].v_pointer &&
g_type_is_a (G_PARAM_SPEC_TYPE (dest_value->data[0].v_pointer), G_VALUE_TYPE (dest_value)))
dest_value->data[0].v_pointer = g_param_spec_ref (src_value->data[0].v_pointer);
else
dest_value->data[0].v_pointer = NULL;
}
static gpointer
value_param_peek_pointer (const GValue *value)
{
return value->data[0].v_pointer;
}
static gchar*
value_param_collect_value (GValue *value,
guint n_collect_values,
GTypeCValue *collect_values,
guint collect_flags)
{
if (collect_values[0].v_pointer)
{
GParamSpec *param = collect_values[0].v_pointer;
if (param->g_type_instance.g_class == NULL)
return g_strconcat ("invalid unclassed param spec pointer for value type `",
G_VALUE_TYPE_NAME (value),
"'",
NULL);
else if (!g_value_type_compatible (G_PARAM_SPEC_TYPE (param), G_VALUE_TYPE (value)))
return g_strconcat ("invalid param spec type `",
G_PARAM_SPEC_TYPE_NAME (param),
"' for value type `",
G_VALUE_TYPE_NAME (value),
"'",
NULL);
value->data[0].v_pointer = g_param_spec_ref (param);
}
else
value->data[0].v_pointer = NULL;
return NULL;
}
static gchar*
value_param_lcopy_value (const GValue *value,
guint n_collect_values,
GTypeCValue *collect_values,
guint collect_flags)
{
GParamSpec **param_p = collect_values[0].v_pointer;
if (!param_p)
return g_strdup_printf ("value location for `%s' passed as NULL", G_VALUE_TYPE_NAME (value));
if (!value->data[0].v_pointer)
*param_p = NULL;
else if (collect_flags & G_VALUE_NOCOPY_CONTENTS)
*param_p = value->data[0].v_pointer;
else
*param_p = g_param_spec_ref (value->data[0].v_pointer);
return NULL;
}
/* --- param spec pool --- */
/**
* GParamSpecPool:
*
* A #GParamSpecPool maintains a collection of #GParamSpec<!-- -->s which can be
* quickly accessed by owner and name. The implementation of the #GObject property
* system uses such a pool to store the #GParamSpecs of the properties all object
* types.
*/
struct _GParamSpecPool
{
GStaticMutex smutex;
gboolean type_prefixing;
GHashTable *hash_table;
};
static guint
param_spec_pool_hash (gconstpointer key_spec)
{
const GParamSpec *key = key_spec;
const gchar *p;
guint h = key->owner_type;
for (p = key->name; *p; p++)
h = (h << 5) - h + *p;
return h;
}
static gboolean
param_spec_pool_equals (gconstpointer key_spec_1,
gconstpointer key_spec_2)
{
const GParamSpec *key1 = key_spec_1;
const GParamSpec *key2 = key_spec_2;
return (key1->owner_type == key2->owner_type &&
strcmp (key1->name, key2->name) == 0);
}
/**
* g_param_spec_pool_new:
* @type_prefixing: Whether the pool will support type-prefixed property names.
*
* Creates a new #GParamSpecPool.
*
* If @type_prefixing is %TRUE, lookups in the newly created pool will
* allow to specify the owner as a colon-separated prefix of the
* property name, like "GtkContainer:border-width". This feature is
* deprecated, so you should always set @type_prefixing to %FALSE.
*
* Returns: a newly allocated #GParamSpecPool.
*/
GParamSpecPool*
g_param_spec_pool_new (gboolean type_prefixing)
{
static GStaticMutex init_smutex = G_STATIC_MUTEX_INIT;
GParamSpecPool *pool = g_new (GParamSpecPool, 1);
memcpy (&pool->smutex, &init_smutex, sizeof (init_smutex));
pool->type_prefixing = type_prefixing != FALSE;
pool->hash_table = g_hash_table_new (param_spec_pool_hash, param_spec_pool_equals);
return pool;
}
/**
* g_param_spec_pool_insert:
* @pool: a #GParamSpecPool.
* @pspec: the #GParamSpec to insert
* @owner_type: a #GType identifying the owner of @pspec
*
* Inserts a #GParamSpec in the pool.
*/
void
g_param_spec_pool_insert (GParamSpecPool *pool,
GParamSpec *pspec,
GType owner_type)
{
gchar *p;
if (pool && pspec && owner_type > 0 && pspec->owner_type == 0)
{
G_SLOCK (&pool->smutex);
for (p = pspec->name; *p; p++)
{
if (!strchr (G_CSET_A_2_Z G_CSET_a_2_z G_CSET_DIGITS "-_", *p))
{
g_warning (G_STRLOC ": pspec name \"%s\" contains invalid characters", pspec->name);
G_SUNLOCK (&pool->smutex);
return;
}
}
pspec->owner_type = owner_type;
g_param_spec_ref (pspec);
g_hash_table_insert (pool->hash_table, pspec, pspec);
G_SUNLOCK (&pool->smutex);
}
else
{
g_return_if_fail (pool != NULL);
g_return_if_fail (pspec);
g_return_if_fail (owner_type > 0);
g_return_if_fail (pspec->owner_type == 0);
}
}
/**
* g_param_spec_pool_remove:
* @pool: a #GParamSpecPool
* @pspec: the #GParamSpec to remove
*
* Removes a #GParamSpec from the pool.
*/
void
g_param_spec_pool_remove (GParamSpecPool *pool,
GParamSpec *pspec)
{
if (pool && pspec)
{
G_SLOCK (&pool->smutex);
if (g_hash_table_remove (pool->hash_table, pspec))
g_param_spec_unref (pspec);
else
g_warning (G_STRLOC ": attempt to remove unknown pspec `%s' from pool", pspec->name);
G_SUNLOCK (&pool->smutex);
}
else
{
g_return_if_fail (pool != NULL);
g_return_if_fail (pspec);
}
}
static inline GParamSpec*
param_spec_ht_lookup (GHashTable *hash_table,
const gchar *param_name,
GType owner_type,
gboolean walk_ancestors)
{
GParamSpec key, *pspec;
key.owner_type = owner_type;
key.name = (gchar*) param_name;
if (walk_ancestors)
do
{
pspec = g_hash_table_lookup (hash_table, &key);
if (pspec)
return pspec;
key.owner_type = g_type_parent (key.owner_type);
}
while (key.owner_type);
else
pspec = g_hash_table_lookup (hash_table, &key);
if (!pspec && !is_canonical (param_name))
{
/* try canonicalized form */
key.name = g_strdup (param_name);