SEF router plugin for EDocman extension

router.php

<?php
/**
 * @version		1.5.2
 * @package		Joomla
 * @subpackage	Edocman
 * @author  Tuan Pham Ngoc
 * @copyright	Copyright (C) 2011 Ossolution Team
 * @license		GNU/GPL, see LICENSE.php
 */
defined('_JEXEC') or die();

/**
 * Build the route for the com_edocman component
 *
 * @param	array	An array of URL arguments
 * @return	array	The URL arguments to use to assemble the subsequent URL.
 * @since	1.5
 */
function EdocmanBuildRoute(&$query)
{
	$db = JFactory::getDbo();
	$queryArr = $query;
	if (isset($queryArr['option']))
		unset($queryArr['option']);
	if (isset($queryArr['Itemid']))
		unset($queryArr['Itemid']);
	//Store the query string to use in the parseRouter method	
	$queryString = http_build_query($queryArr);	
	$segments = array();
	$view = isset($query['view']) ? $query['view'] : '';
	$task = isset($query['task']) ? $query['task'] : '';
	$id = 	isset($query['id']) ? (int) $query['id'] : 0;
	switch ($view)	
	{
		case 'categories':
		case 'category' :
			if ($id)
				$segments = array_merge( $segments, EdocmanHelper::getCategoryArray($id));
			$segments[] = JText::_('EDOCMAN_SEF_VIEW_CAT');
			break;
		case 'document' :
			if ($id) {				
				$segments[] = EdocmanHelper::getDocumentTitle($id);				
			}
									
			break ;		
	}
	
	switch ($task)
	{
		case 'document.download' :
		case 'document.viewdoc' :
		case 'document.edit':
			if ($id) {
				$segments[] = EdocmanHelper::getDocumentTitle($id);
			}
			$languageItem = 'EDOCMAN_SEF_'.strtoupper(implode('_', explode('.', $task))) ;
			$segments[] = JText::_($languageItem);
			break ;
	}
	if (isset($query['task']))
	{		
		unset($query['task']);
	}
	if (isset($query['view']))
	{
		unset($query['view']);
	}		
	if (isset($query['id']))
	{
		unset($query['id']);
	}	
	if (count($segments))
	{
		$segments = array_map('JApplication::stringURLSafe', $segments);
		$key = md5(implode('/', $segments));
		$q = $db->getQuery(true);
		$q->select('COUNT(*)')
		->from('#__edocman_urls')
		->where('md5_key="'.$key.'"')
		;
		$db->setQuery($q);
		$total = $db->loadResult();
		if (!$total)
		{
			$q->clear();
			$q->insert('#__edocman_urls')
			->columns('md5_key, `query`')
			->values("'$key', '$queryString'");
			$db->setQuery($q);
			$db->query();
		}
	}		
		
	return $segments;
}

/**
 * Parse the segments of a URL.
 *
 * @param	array	The segments of the URL to parse.
 *
 * @return	array	The URL attributes to be used by the application.
 * @since	1.5
 */
function EdocmanParseRoute($segments)
{		
	$vars = array();
	if (count($segments))
	{
		$db = JFactory::getDbo();
		$key = md5(str_replace(':', '-', implode('/', $segments)));
		$query = $db->getQuery(true);
		
		$query->select('`query`')
		->from('#__edocman_urls')
		->where('md5_key="'.$key.'"');
		
		$db->setQuery($query);
		$queryString = $db->loadResult();
		if ($queryString)
			parse_str($queryString, $vars);				
	}
				
	return $vars;
}