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<?php
/**
* Jaxl (Jabber XMPP Library)
*
* Copyright (c) 2009-2012, Abhinav Singh <me@abhinavsingh.com>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of Abhinav Singh nor the names of his
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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
* COPYRIGHT OWNER OR CONTRIBUTORS 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, STRIC
* 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.
*
*/
abstract class JAXLFsm {
protected $state = null;
// abstract method
abstract public function handle_invalid_state($r);
public function __construct($state) {
$this->state = $state;
}
// returned value from state callbacks can be:
// 1) array([0]=>'new_state', [1]=>'return value for current callback')
// 2) array([0]=>'new_state')
// 3) 'new_state'
public function __call($event, $args) {
if($this->state) {
_debug("calling state handler '".$this->state."' for incoming event '".$event."'");
$call = method_exists($this, $this->state) ? array(&$this, $this->state): $this->state;
$r = call_user_func($call, $event, $args);
if(is_array($r) && sizeof($r) == 2) list($this->state, $ret) = $r;
else if(is_array($r) && sizeof($r) == 1) $this->state = $r[0];
else if(is_string($r)) $this->state = $r;
else $this->handle_invalid_state($r);
_debug("current state '".$this->state."'");
if(is_array($r) && sizeof($r) == 2)
return $ret;
}
else {
_debug("invalid state found, nothing called for event ".$event."");
}
}
}
?>
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