<?php
/**
 * Event Handler Config to Event Data
 *
 * @author gERD Schaufelberger <gerd@php-tools.net>
 * @license PHP License
 * @package WB
 * @subpackage base
 */

WBClass::load('WBEvent_Handler');

/**
 * Event Handler Config to Event Data
 *
 * Set event data by config
 *
 * @version 1.1.0
 * @package WB
 * @subpackage base
 */
class WBEvent_Handler_Config2Event extends WBEvent_Handler
{    
    /**
     * Handler config
     *
     * Parameters:
     * - condition: default null
     * - switch:
     * - default:
     * - target:
     *
     * If parameter condition is empty, any config parameter will be copied to event data.
     *
     * In case there is condition, it will be used as some kind of switch-case. Where condition
     * is the event data variable's name
     *
     * @var array
     */
    protected $config   =   array(
                                        'condition' =>  null,
                                        'default'   =>  null,
                                        'target'    =>  null,
                                        'switch'    =>  array()
                                    );

    /**
     * Set Event Data From Config
     * 
     * @see isRecoverable()
     * @param WBEvent $e
     * @return bool true to continue, false to stop processing
     */
    public function process(WBEvent $e)
    {
        // copy everything
        if (!isset($this->config['condition'])) {
            foreach ($this->config as $k => $v) {
                if (is_null($v)) {
                    continue;
                }
                $e->set($k, $v);
            }
            return true;
        }

        if (empty($this->config['target'])) {
            WBClass::load('WBException_Config');
            throw new WBException_Datasource('Check config, there is no target set.', 1, __CLASS__);
            return false;
        }

        $cond   =   $e->get($this->config['condition'], '');
        if (empty($cond)) {
            WBClass::load('WBException_Config');
            throw new WBException_Datasource('Check config, condition variable of event must not be empty.', 2, __CLASS__);
            return false;
        }
        if (empty($this->config['switch']) || !is_array($this->config['switch'])) {
            WBClass::load('WBException_Config');
            throw new WBException_Datasource('Check config, switch is empty or not an (associative) array.', 3, __CLASS__);
            return false;
        }

        if (isset($this->config['switch'][$cond])) {
            $e->set($this->config['target'], $this->config['switch'][$cond]);
            return true;
        }

        if (isset($this->config['default'])) {
            $e->set($this->config['target'], $this->config['default']);
        }
        return true;
    }    
}