khosb/modules/product/classes/Model/Product/Plugin.php

<?php defined('SYSPATH') or die('No direct access allowed.');

/**
 * This class supports Product Plugins.
 *
 * @package    Product/Plugin
 * @category   Models
 * @author     Deon George
 * @copyright  (c) 2009-2013 Open Source Billing
 * @license    http://dev.osbill.net/license.html
 */
abstract class Model_Product_Plugin extends ORM_OSB {
	// Reset any sorting that may be defined in our parent
	protected $_sorting = array();

	/**
	 * The cost of this service
	 */
	abstract public function cost($annual=FALSE);

	/**
	 * The feature summary should be implemented in plugins.
	 * It is displayed on the product overview page, as a summary of the products features.
	 */
	abstract public function feature_summary();

	/**
	 * Return the name of the plugin
	 */
	protected function plugin() {
		return strtolower(preg_replace('/(.*)_([a-zA-Z]+)$/',"$2",get_class($this)));
	}

	/**
	 * Form info for admins to update with plugin data
	 */
	abstract public function render_edit();

	abstract public function render_order();

	abstract public function supplier();
}
?>