Vm2Mage plugin for manipulate VirtueMart data before migration to Magento

vm2mage_plugin.php

<?php
defined('_JEXEC') or die();

class PlgSystemCustom extends JPlugin
{
    /**
     * Plugin event dealing with raw VirtueMart data
     */
    public function onVm2MageItemConvertBefore($item, $type)
    {
        if ($type == 'product')
        {
            if (isset($item['dummy_attribute1']))
            {
                $item['dummy_attribute2'] = $item['dummy_attribute1'];
            }
        }
    }

    /**
     * Plugin event dealing with VirtueMart data manipulated by Vm2Mage
     */
    public function onVm2MageItemConvertAfter($item, $type)
    {
        if ($type == 'product')
        {
            if (isset($item['dummy_attribute1']))
            {
                $item['dummy_attribute2'] = $item['dummy_attribute1'];
            }
        }
    }

    /**
     * Plugin event to change a VirtueMart attribute-name to be Magento compliant
     */
    public function onVm2MageAttributeLoadName(&$attributeName)
    {
        if ($attributeName == 'colour')
        {
            $attributeName = 'color';
        }
    }
}