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/*
* libmowgli: A collection of useful routines for programming.
* mowgli_object.c: Object management.
*
* Copyright (c) 2007 William Pitcock <nenolod -at- sacredspiral.co.uk>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice is present in all copies.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "mowgli.h"
/*
* mowgli_object_init
*
* Populates the object manager part of an object.
*
* Inputs:
* - pointer to object manager area
* - (optional) name of object
* - (optional) class of object
* - (optional) custom destructor
*
* Outputs:
* - none
*
* Side Effects:
* - none
*/
void mowgli_object_init(mowgli_object_t *obj, const char *name, mowgli_object_class_t *klass, mowgli_destructor_t des)
{
return_if_fail(obj != NULL);
if (name != NULL)
obj->name = strdup(name);
if (klass != NULL)
obj->klass = klass;
else
{
mowgli_object_class_t *tmp = mowgli_alloc(sizeof(mowgli_object_class_t));
mowgli_object_class_init(tmp, name, des, TRUE);
obj->klass = tmp;
}
obj->refcount = 1;
obj->message_handlers.head = NULL;
obj->message_handlers.tail = NULL;
obj->message_handlers.count = 0;
obj->metadata.head = NULL;
obj->metadata.tail = NULL;
obj->metadata.count = 0;
mowgli_object_message_broadcast(obj, "create");
}
/*
* mowgli_object_init_from_class
*
* Populates the object manager part of an object from an object class.
*
* Inputs:
* - pointer to object manager area
* - class of object
*
* Outputs:
* - none
*
* Side Effects:
* - none
*/
void
mowgli_object_init_from_class(mowgli_object_t *obj, const char *name,
mowgli_object_class_t *klass)
{
return_if_fail(obj != NULL);
return_if_fail(klass != NULL);
mowgli_object_init(obj, name, klass, NULL);
}
/*
* mowgli_object_ref
*
* Increment the reference counter on an object.
*
* Inputs:
* - the object to refcount
*
* Outputs:
* - none
*
* Side Effects:
* - none
*/
void * mowgli_object_ref(void *object)
{
return_val_if_fail(object != NULL, NULL);
mowgli_object(object)->refcount++;
return object;
}
/*
* mowgli_object_unref
*
* Decrement the reference counter on an object.
*
* Inputs:
* - the object to refcount
*
* Outputs:
* - none
*
* Side Effects:
* - if the refcount is 0, the object is destroyed.
*/
void mowgli_object_unref(void *object)
{
mowgli_object_t *obj = mowgli_object(object);
return_if_fail(object != NULL);
obj->refcount--;
if (obj->refcount <= 0)
{
mowgli_object_message_broadcast(obj, "destroy");
if (obj->name != NULL)
free(obj->name);
if (obj->klass != NULL)
{
mowgli_destructor_t destructor = obj->klass->destructor;
if (obj->klass->dynamic == TRUE)
mowgli_object_class_destroy(obj->klass);
if (destructor != NULL)
destructor(obj);
else
free(obj);
}
else
mowgli_throw_exception(mowgli.object.invalid_object_class_exception);
}
}
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