<?php
/**
 * Smarty Xcache Caching Handler
 *
 * @author Alexander Over <alexander.over@koeln.de>
 * @copyright 2008
 */
function xcache_cache_handler($action, &$smarty_obj, &$cache_content, $tpl_file = null, $cache_id = null, $compile_id = null)
{
  if (function_exists('xcache_isset'))
  {
    $cacheid = 'smarty.'.$tpl_file.'@'.$cache_id.'@'.$compile_id;
    switch ($action)
    {
      case 'read':
        if (xcache_isset($cacheid))
        {
          return xcache_get($cacheid);
        }
        else
        {
          return false;
        }
      case 'write':
        return xcache_set($cacheid, $cache_content, $smarty_obj->cache_lifetime);
      case 'clear':
        if (empty($cache_id) and empty($compile_id) and empty($tpl_file))
        {
      	 return xcache_clear_cache(1, 0);
        }
        else
        {
          if (xcache_isset($cacheid))
          {
            return xcache_unset($cacheid);
          }
          else
          {
            return false;
          }
        }
      default:
      	$smarty_obj->trigger_error('cache_handler: unknown action "'.$action.'"' );
        return false;
    }
  }
  else
  {
    $smarty_obj->trigger_error('cache_handler: Xcache not found!');
    return false;
  }
}