<?php
/**
 * @version		$Id: field.php 280 2010-09-18 02:14:15Z eddieajau $
 * @package		NewLifeInIT
 * @subpackage	com_exchange
 * @copyright	Copyright 2005 - 2010 New Life in IT Pty Ltd. All rights reserved.
 * @license		GNU General Public License version 2 or later.
 * @link		http://www.theartofjoomla.com
 */

// no direct access
defined('_JEXEC') or die;

/**
 * @package		NewLifeInIT
 * @subpackage	com_exchange
 */
class XMLTransformField extends XMLIterator
{
	/**
	 * Evaluates an expression
	 *
	 * Has the attributes name, required, from, value
	 *
	 * @param	object	The tag node
	 * @param	mixed	The value of the field
	 */
	function iterate(&$node, &$value)
	{
		$name		= (string) $node['name'];
		$required	= XMLHelper::isBool($node['required']);
		//$model	= &$this->getModel();
		//$debug	= $model->getOption('debug_mode');

		// $result[0] contains the name of the field being iterated
		// $result[1] contains the value of the field being iterated
		// $result[2] indicates a required field which is empty
		$result		= array();
		$result[0]	= $name;
		$result[1]	= null;
		$result[2]	= false;

		if ($v = (string) $node['value'])
		{
			$result[1]	= $node['value'];
		}
		else
		{
			$from = (string) $node['from'];

			// this is the case for expression
			if ($test = parent::iterate($node, $value)) {
				if ($required and !$test[0]) {
					$result[2] = true;
				} else {
					$result[1]	= $test[0];
				}
			}
			else if ($from)
			{
				if ($required and !$value[$from]) {
					$result[2] = true;
				}
				else {
					//if ($debug AND !isset($value[$from])) {
					//	ExchangeLog::add(200, '(' . (string) $node . ")\n= (".$result.')');
					//}
					$result[1]	= $value[$from];
				}
			}
		}

		return $result;
	}
}