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/*
* libmowgli: A collection of useful routines for programming.
* mowgli_object_class.c: Object class and type management,
* cast checking.
*
* 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"
static mowgli_patricia_t *mowgli_object_class_dict = NULL;
static void _object_key_canon(char *str)
{
while (*str)
{
*str = toupper(*str);
str++;
}
}
void mowgli_object_class_init(mowgli_object_class_t *klass, const char *name, mowgli_destructor_t des, mowgli_boolean_t dynamic)
{
/* if the object_class dictionary has not yet been initialized, we will want to do that. */
if (mowgli_object_class_dict == NULL)
mowgli_object_class_dict = mowgli_patricia_create(_object_key_canon);
if (klass == NULL)
mowgli_throw_exception_fatal(mowgli.object_class.invalid_object_class_exception);
if (mowgli_object_class_find_by_name(name) != NULL)
mowgli_throw_exception_fatal(mowgli.object_class.duplicate_object_class_exception);
/* initialize object_class::name */
klass->name = strdup(name);
/* initialize object_class::derivitives */
klass->derivitives.head = NULL;
klass->derivitives.tail = NULL;
klass->derivitives.count = 0;
/* initialize object_class::destructor */
klass->destructor = des != NULL ? des : mowgli_free;
/* initialize object_class::dynamic */
klass->dynamic = dynamic;
/* add to the object_class index */
mowgli_patricia_add(mowgli_object_class_dict, klass->name, klass);
}
int mowgli_object_class_check_cast(mowgli_object_class_t *klass1, mowgli_object_class_t *klass2)
{
mowgli_node_t *n;
if (klass1 == NULL || klass2 == NULL)
mowgli_throw_exception_val(mowgli.object_class.invalid_object_class_exception, 0);
MOWGLI_LIST_FOREACH(n, klass1->derivitives.head)
{
mowgli_object_class_t *tklass = (mowgli_object_class_t *) n->data;
if (tklass == klass2)
return 1;
}
return 0;
}
void mowgli_object_class_set_derivitive(mowgli_object_class_t *klass, mowgli_object_class_t *parent)
{
if (klass == NULL || parent == NULL)
mowgli_throw_exception_fatal(mowgli.object_class.invalid_object_class_exception);
mowgli_node_add(klass, mowgli_node_create(), &parent->derivitives);
}
void *mowgli_object_class_reinterpret_impl(/* mowgli_object_t */ void *opdata, mowgli_object_class_t *klass)
{
mowgli_object_t *object = mowgli_object(opdata);
/* this can possibly happen at runtime .. lets not make it a fatal exception. */
return_val_if_fail(object != NULL, NULL);
return_val_if_fail(klass != NULL, NULL);
if (mowgli_object_class_check_cast(object->klass, klass))
return object;
mowgli_log("Invalid reinterpreted cast from %s<%p> to %s", object->klass->name, klass->name);
return NULL;
}
mowgli_object_class_t *mowgli_object_class_find_by_name(const char *name)
{
return mowgli_patricia_retrieve(mowgli_object_class_dict, name);
}
void mowgli_object_class_destroy(mowgli_object_class_t *klass)
{
mowgli_node_t *n, *tn;
if (klass == NULL)
mowgli_throw_exception_fatal(mowgli.object_class.invalid_object_class_exception);
if (klass->dynamic != TRUE)
mowgli_throw_exception_fatal(mowgli.object_class.nondynamic_object_class_exception);
MOWGLI_LIST_FOREACH_SAFE(n, tn, klass->derivitives.head)
{
mowgli_node_delete(n, &klass->derivitives);
mowgli_node_free(n);
}
mowgli_free(klass->name);
mowgli_free(klass);
}
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