Source for file AJAX_Locking.php

<?php
/* vim: set number autoindent tabstop=2 shiftwidth=2 softtabstop=2: */
 
/**
* AJAX_Locking
*
* An AJAX framework to manage object locking
* PHP versions 4 and 5
*
* LICENSE: This source file is subject to version 3.0 of the PHP license
* that is available through the world-wide-web at the following URI:
* http://www.php.net/license/3_0.txt.  If you did not receive a copy of
* the PHP License and are unable to obtain it through the web, please
* send a note to license@php.net so we can mail you a copy immediately.
*
* @category   HTML
* @package    AJAX_Locking
* @author     Fabio Ambrosanio <fabio@ambrosanio.com>
* @license    http://www.php.net/license/3_01.txt  PHP
* @version    @package_version@
*/
require_once 'HTML/AJAX/Server.php';
 
define("AJAX_LOCKING_DRIVER_DEFAULT", "File");
 
/**
 * This class implement a AJAX technique to locking of any object that
 * is identified by an id.
 *
 */
class AJAX_Locking extends HTML_AJAX_Server 
{
    var $initMethods = true;
    var $driver;
    
    /**
     * Constructor
     *
     * @return AJAX_Locking 
     */
    function AJAX_Locking($driver = false)
    {
        parent::HTML_AJAX_Server();
        $this->driver = $driver;
 
        // registers aux library
        $path = '@data-dir@'.DIRECTORY_SEPARATOR.'AJAX_Locking'.DIRECTORY_SEPARATOR.'js'.DIRECTORY_SEPARATOR;
        if(strpos($path, '@'.'data-dir@') === 0) {
            $path = realpath(dirname(__FILE__).DIRECTORY_SEPARATOR.'js').DIRECTORY_SEPARATOR;
        }
        
        $this->registerJSLibrary('Locking','Locking.js', $path);
    }
        
    /**
     * Register the driver as AJAX remote object
     *
     * @param uriver $driver 
     */
    function initAjaxLocking() 
    {
        if (!$this->driver) {
            require_once ( dirname(__FILE__) . "/Driver/" . AJAX_LOCKING_DRIVER_DEFAULT . ".php");
            $this->driver = new AJAX_Locking_Driver_SharedMemory();
        } 
        $this->registerClass($this->driver, 'AjaxLocking');        
    }    
}
 
?>