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/*
* libmowgli: A collection of useful routines for programming.
* messaging.c: Object event notification and message passing.
*
* 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"
void mowgli_object_class_message_handler_attach(mowgli_object_class_t *klass, mowgli_object_message_handler_t *sig)
{
if (klass == NULL)
mowgli_throw_exception(mowgli.object_messaging.invalid_object_class_exception);
if (sig == NULL)
mowgli_throw_exception(mowgli.object_messaging.invalid_signal_exception);
mowgli_node_add(sig, mowgli_node_create(), &klass->message_handlers);
}
void mowgli_object_class_message_handler_detach(mowgli_object_class_t *klass, mowgli_object_message_handler_t *sig)
{
mowgli_node_t *n;
if (klass == NULL)
mowgli_throw_exception(mowgli.object_messaging.invalid_object_class_exception);
if (sig == NULL)
mowgli_throw_exception(mowgli.object_messaging.invalid_signal_exception);
n = mowgli_node_find(sig, &klass->message_handlers);
mowgli_node_delete(n, &klass->message_handlers);
mowgli_node_free(n);
}
void mowgli_object_message_handler_attach(mowgli_object_t *self, mowgli_object_message_handler_t *sig)
{
if (self == NULL)
mowgli_throw_exception(mowgli.object_messaging.invalid_object_exception);
if (sig == NULL)
mowgli_throw_exception(mowgli.object_messaging.invalid_signal_exception);
mowgli_node_add(sig, mowgli_node_create(), &self->message_handlers);
}
void mowgli_object_message_handler_detach(mowgli_object_t *self, mowgli_object_message_handler_t *sig)
{
mowgli_node_t *n;
if (self == NULL)
mowgli_throw_exception(mowgli.object_messaging.invalid_object_exception);
if (sig == NULL)
mowgli_throw_exception(mowgli.object_messaging.invalid_signal_exception);
n = mowgli_node_find(sig, &self->message_handlers);
mowgli_node_delete(n, &self->message_handlers);
mowgli_node_free(n);
}
void mowgli_object_message_broadcast(mowgli_object_t *self, const char *name, ...)
{
mowgli_argstack_t *stack;
mowgli_object_message_handler_t *sig = NULL;
mowgli_node_t *n;
va_list va;
if (self == NULL)
mowgli_throw_exception(mowgli.object_messaging.invalid_object_exception);
if (name == NULL)
mowgli_throw_exception(mowgli.null_pointer_exception);
/* try to find a signal to compile the argument stack from, we start with self::klass first. */
MOWGLI_LIST_FOREACH(n, self->klass->message_handlers.head)
{
mowgli_object_message_handler_t *sig2 = (mowgli_object_message_handler_t *) n->data;
if (!strcasecmp(sig2->name, name))
{
sig = sig2;
break;
}
}
if (sig == NULL)
{
MOWGLI_LIST_FOREACH(n, self->klass->message_handlers.head)
{
mowgli_object_message_handler_t *sig2 = (mowgli_object_message_handler_t *) n->data;
if (!strcasecmp(sig2->name, name))
{
sig = sig2;
break;
}
}
}
/* return if no signals found, else compile the argstack */
if (sig == NULL)
return;
va_start(va, name);
stack = mowgli_argstack_create_from_va_list(sig->descstr, va);
va_end(va);
MOWGLI_LIST_FOREACH(n, self->klass->message_handlers.head)
{
sig = (mowgli_object_message_handler_t *) n->data;
if (!strcasecmp(sig->name, name) && sig->handler != NULL)
sig->handler(self, sig, stack);
}
MOWGLI_LIST_FOREACH(n, self->message_handlers.head)
{
sig = (mowgli_object_message_handler_t *) n->data;
if (!strcasecmp(sig->name, name) && sig->handler != NULL)
sig->handler(self, sig, stack);
}
mowgli_object_unref(stack);
}
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