<?php
/**
 * Configure class loader
 *
 * $Id$
 *
 * @author gERD Schaufelberger <gerd@php-tools.net>
 * @license PHP License
 * @package WB
 * @subpackage base
 */

/**
 * Configure class loader
 *
 * @version 0.1.3
 * @package WB
 * @subpackage base
 */
class WBClass_Configurator extends WBClass implements WBParam_Observer
{
   /**
    * keep reference to singleton
    */
    static protected $_instance = null;

   /**
    * Static constructor
    *
    * Don't do anything
    */
    static public function staticConstruct()
    {
    }

   /**
    * receive singleton instance
    *
    * @return WBClass_Configurator
    */
    static public function start()
    {
        if (self::$_instance) {
            return self::$_instance;
        }

        self::$_instance    =   new WBClass_Configurator();
        return self::$_instance;
    }

   /**
    * private constructor
    *
    * setup as parameter observer
    */
    private function __construct()
    {
        WBParam::set('wb/class/includepath', WBClass::$_incDir);
        WBParam::set('wb/class/local', WBClass::$_locals);

        $autoload   =   WBParam::get('wb/class/autoload', false);
        WBClass::registerAutoload($autoload);

        WBParam::attach('wb/class/phpincludepath', $this);
        WBParam::attach('wb/class/includepath', $this);
        WBParam::attach('wb/class/local', $this);
        WBParam::attach('wb/class/autoload', $this);

        // set PHP include path
        $incPath    =   array(
                                '.',
                                WBParam::get('wb/dir/system') . '/include/pear/include'
                            );
        $incPath    =   WBParam::get('wb/class/phpincludepath', $incPath);
        WBParam::set('wb/class/phpincludepath', $incPath);
    }

   /**
    * Interface on set for parameter
    *
    * Implement things to be done when parameter is set
    *
    * @param string $name
    * @param mixed $value
    * @return bool true on success
    */
    public function notifyOnSet($name, $value)
    {
        switch( $name ) {
            case 'wb/class/local';
                WBClass::updateLocals($value);
                break;

            case 'wb/class/phpincludepath';
                if (!is_array($value)) {
                    $value  =   explode(PATH_SEPARATOR, $value);
                }
                set_include_path(implode(PATH_SEPARATOR, $value));
                break;

            case 'wb/class/includepath';
                WBClass::updateIncDir($value);
                break;

            case 'wb/class/autoload';
                WBClass::registerAutoload($value);
                break;

            default:
                break;
        }

        return true;
    }
}
?>