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

WBClass::load('WBEvent_Handler'
    , 'WBEvent_Handler_Table');

/**
 * WBEvent_Handler_Table_Loader
 *
 * @version 0.2.0
 * @package Wombat
 * @subpackage eventHandler
 */
class WBEvent_Handler_Table_Loader extends WBEvent_Handler_Table
{
    /**
     * Handler Config
     *
     * - table name of table to update
     * - key primary key of row to update
     * - keyindex data index where to achieve the primary key from
     * - target name of event's data array to fill with table values
     * - prefix merge loaded data with event data using prefix
     *
     * @var array
     */
    protected $config   =   array(
                                'table'         =>  '',
                                'key'           =>  '',
                                'keyindex'      =>  'id',
                                'target'        =>  '',
                                'prefix'        =>  ''
                                );


    /**
     * Load Data from Table
     *
     *
     * @param WBEvent $e
     * @return bool true to continue, false to stop processing
     * @throws Exception in case of error
     */
    public function process(WBEvent $e)
    {
        $key    =   $this->get4ConfigOrData($e, 'key', true);
        $this->startTable();

        $data   =   $this->table->get($this->config['table'], $key);
        if (1 != count($data)) {
            return false;
        }
        $data   =   $data[0];

        // store in target
        if (!empty($this->config['target'])) {
            $e->set($this->config['target'], $data);
            return true;
        }

        // merge with event data
        foreach ($data as $k => $v) {
            if (!empty($this->config['prefix'])) {
                $k  =   $this->config['prefix'] . $k;
            }
            $e->set($k, $v);
        }

        return true;
    }
}