<?php
/**
 * WBEvent_Handler_Table
 *
 * $Id$
 *
 * @author gERD Schaufelberger <gerd@php-tools.net>
 * @license PHP License
 * @package WB
 * @subpackage eventHandler
 */

WBClass::load('WBEvent_Handler');

/**
 * WBEvent_Handler_Table
 *
 * @version 0.1.0
 * @package Wombat
 * @subpackage eventHandler
 */
class WBEvent_Handler_Table extends WBEvent_Handler
{    
    /**
     * Table access
     * @var WBDatasource_Table
     */
    protected $table;

    /**
     * Constructor
     *
     */
    public function __construct()
    {
        parent::__construct();
        $this->table    =   WBClass::create('WBDatasource_Table');
    }

    /**
     * Get Identifying Key of Record
     *
     * @param WBEvent $e
     * @return string
     * @throws Exception in case of error
     */
    protected function getKey4Config(WBEvent $e)
    {
        if (empty($this->config['table'])) {
            WBClass::load('WBException_Config');
            throw new WBException_Config('Table must not be empty!', 1, __CLASS__);
            return '';
        }

        $key    =   '';
        if (!empty($this->config['key'])) {
            $key    =   $this->config['key'];
            return $key;
        }

        if (!empty($this->config['keyindex'])) {
            $index  =   $this->config['keyindex'];
            if (!is_array($index)) {
                $index  =   array($index);
            }
            $key    =   array();
            foreach ($index as $i) {
                $key[]  =   $e->get($i);
            }
            $key    =   implode('-', $key);
        }

        if (empty($key)) {
            WBClass::load('WBException_Config');
            throw new WBException_Config('Key may not be empty', 2, __CLASS__);
        }
        return $key;
    }
}