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/* mg-referer.c
*
* Copyright (C) 2003 Vivien Malerba
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include "mg-referer.h"
#include "marshal.h"
/* signals */
enum
{
ACTIVATED,
DEACTIVATED,
LAST_SIGNAL
};
static gint mg_referer_signals[LAST_SIGNAL] = { 0, 0 };
static void mg_referer_iface_init (gpointer g_class);
GType
mg_referer_get_type (void)
{
static GType type = 0;
if (!type) {
static const GTypeInfo info = {
sizeof (MgRefererIface),
(GBaseInitFunc) mg_referer_iface_init,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) NULL,
NULL,
NULL,
0,
0,
(GInstanceInitFunc) NULL
};
type = g_type_register_static (G_TYPE_INTERFACE, "MgReferer", &info, 0);
g_type_interface_add_prerequisite (type, G_TYPE_OBJECT);
}
return type;
}
static void
mg_referer_iface_init (gpointer g_class)
{
static gboolean initialized = FALSE;
if (! initialized) {
mg_referer_signals[ACTIVATED] =
g_signal_new ("activated",
MG_REFERER_TYPE,
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (MgRefererIface, activated),
NULL, NULL,
marshal_VOID__VOID, G_TYPE_NONE,
0);
mg_referer_signals[DEACTIVATED] =
g_signal_new ("deactivated",
MG_REFERER_TYPE,
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (MgRefererIface, deactivated),
NULL, NULL,
marshal_VOID__VOID, G_TYPE_NONE,
0);
initialized = TRUE;
}
}
/**
* mg_referer_activate
* @iface: an object which implements the #MgReferer interface
*
* Tries to activate the object, does nothing if the object is already active.
*
* Returns: TRUE if the object is active after the call
*/
gboolean
mg_referer_activate (MgReferer *iface)
{
g_return_val_if_fail (iface && IS_MG_REFERER (iface), FALSE);
if (MG_REFERER_GET_IFACE (iface)->activate)
return (MG_REFERER_GET_IFACE (iface)->activate) (iface);
return TRUE;
}
/**
* mg_referer_deactivate
* @iface: an object which implements the #MgReferer interface
*
* Deactivates the object. This is the opposite to function mg_referer_activate().
* If the object is already non active, then nothing happens.
*/
void
mg_referer_deactivate (MgReferer *iface)
{
g_return_if_fail (iface && IS_MG_REFERER (iface));
if (MG_REFERER_GET_IFACE (iface)->deactivate)
(MG_REFERER_GET_IFACE (iface)->deactivate) (iface);
}
/**
* mg_referer_is_active
* @iface: an object which implements the #MgReferer interface
*
* Get the status of an object
*
* Returns: TRUE if the object is active
*/
gboolean
mg_referer_is_active (MgReferer *iface)
{
g_return_val_if_fail (iface && IS_MG_REFERER (iface), FALSE);
if (MG_REFERER_GET_IFACE (iface)->is_active)
return (MG_REFERER_GET_IFACE (iface)->is_active) (iface);
return TRUE;
}
/**
* mg_referer_get_ref_objects
* @iface: an object which implements the #MgReferer interface
*
* Get the list of objects which are referenced by @iface. The returned list is a
* new list. If @iface is not active, then the returned list is incomplete.
*
* Returns: a new list of referenced objects
*/
GSList *
mg_referer_get_ref_objects (MgReferer *iface)
{
g_return_val_if_fail (iface && IS_MG_REFERER (iface), NULL);
if (MG_REFERER_GET_IFACE (iface)->get_ref_objects)
return (MG_REFERER_GET_IFACE (iface)->get_ref_objects) (iface);
return NULL;
}
/**
* mg_referer_replace_refs
* @iface: an object which implements the #MgReferer interface
* @replacements: a #GHashTable
*
* Ask @iface to replace references to objects listed as keys in the @replacements hash table
* with references to objects of the corresponding value.
*
* It's up to the caller to make sure each pair of (key, value) objects in @replacements are of the
* same type, and that it makes sense to procede to the replacement.
*
* The object implementing this interface will accept to do any work only if it is
* already active.
*/
void
mg_referer_replace_refs (MgReferer *iface, GHashTable *replacements)
{
g_return_if_fail (iface && IS_MG_REFERER (iface));
if (!replacements)
return;
if (MG_REFERER_GET_IFACE (iface)->replace_refs)
(MG_REFERER_GET_IFACE (iface)->replace_refs) (iface, replacements);
}
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