/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/*

 * Copyright (C) 2003 Imendio AB

 *

 * This program 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 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser 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 <config.h>

#include "lm-internals.h"

#include "lm-message-handler.h"

struct LmMessageHandler {

	gboolean                valid;

        gint                    ref_count;

        LmHandleMessageFunction function;

        gpointer                user_data;

        GDestroyNotify          notify;

};

LmHandlerResult 

_lm_message_handler_handle_message (LmMessageHandler *handler,

                                    LmConnection     *connection,

                                    LmMessage        *message)

{

        g_return_val_if_fail (handler != NULL, 

                          LM_HANDLER_RESULT_ALLOW_MORE_HANDLERS);

	if (!handler->valid) {

		return LM_HANDLER_RESULT_ALLOW_MORE_HANDLERS;

	}

        if (handler->function) {

                return (* handler->function) (handler, connection, 

                                              message, handler->user_data);

        }

        return LM_HANDLER_RESULT_ALLOW_MORE_HANDLERS;

}

/**

 * lm_message_handler_new:

 * @function: a callback

 * @user_data: user data passed to function

 * @notify: function called when the message handler is freed

 * 

 * Creates a new message handler. This can be set to handle incoming messages

 * and when a message of the type the handler is registered to handle is

 * received @function will be called and @user_data will be passed to it.

 * @notify is called when the message handler is freed, that way any memory

 * allocated by @user_data can be freed.

 * 

 * Return value: a newly created message handler

 **/

LmMessageHandler *

lm_message_handler_new (LmHandleMessageFunction function,

                        gpointer                user_data,

                        GDestroyNotify          notify)

{

        LmMessageHandler *handler;

	g_return_val_if_fail (function != NULL, NULL);

        handler = g_new0 (LmMessageHandler, 1);

        if (handler == NULL) {

                return NULL;

        }

	handler->valid     = TRUE;	

        handler->ref_count = 1;

        handler->function  = function;

        handler->user_data = user_data;

        handler->notify    = notify;

        return handler;

}

/**

 * lm_message_handler_invalidate

 * @handler: an #LmMessageHandler

 *

 * Invalidates the handler. Useful if you need to cancel a reply

 **/

void

lm_message_handler_invalidate (LmMessageHandler *handler)

{

	handler->valid = FALSE;

}

/**

 * lm_message_handler_is_valid

 * @handler: an #LmMessageHandler

 *

 * Fetches whether the handler is valid or not.

 *

 * Return value: #TRUE if @handler is valid, otherwise #FALSE

 **/

gboolean

lm_message_handler_is_valid (LmMessageHandler *handler)

{

	g_return_val_if_fail (handler != NULL, FALSE);

	return handler->valid;

}

/**

 * lm_message_handler_ref:

 * @handler: an #LmMessageHandler

 * 

 * Adds a reference to @handler.

 * 

 * Return value: the message handler

 **/

LmMessageHandler *

lm_message_handler_ref (LmMessageHandler *handler)

{

        g_return_val_if_fail (handler != NULL, NULL);

        handler->ref_count++;

        return handler;

}

/**

 * lm_message_handler_unref:

 * @handler: an #LmMessagHandler

 * 

 * Removes a reference from @handler. When no more references are present the 

 * handler is freed.

 **/

void

lm_message_handler_unref (LmMessageHandler *handler)

{

        g_return_if_fail (handler != NULL);

        handler->ref_count --;

        if (handler->ref_count == 0) {

                if (handler->notify) {

                        (* handler->notify) (handler->user_data);

                }

                g_free (handler);

        }

}