File Manager

<?php

class cms_cache_handler
{
  const TYPE_ANY = 0;
  const TYPE_PAGE = 1;
  const TYPE_CONTENT = 2;
  const TYPE_MODULE = 3;
  const TYPE_TEMPLATE = 4;
  const TYPE_STYLESHEET = 5;

  static private $_instance;
  private $_driver;

  private function __construct() {}
  private function __clone() {}

  final public static function get_instance()
  {
    if( !is_object(self::$_instance) )
      {
	self::$_instance = new cms_cache_handler;
      }
    return self::$_instance;
  }

  final public function set_driver(cms_cache_driver& $driver)
  {
    $this->_driver = $driver;
  }

  final public function get_driver()
  {
    return $this->_driver;
  }

  final public function clear($group = '')
  {
    if( !self::can_cache() ) return FALSE;

    if( is_object($this->_driver) ) {
      return $this->_driver->clear();
    }
    return FALSE;
  }

  final public function get($key,$group = '')
  {
    if( !$this->can_cache() ) return FALSE;

    if( is_object($this->_driver) ) {
      return $this->_driver->get($key,$group);
    }
    return FALSE;
  }

  final public function exists($key,$group = '')
  {
    if( !self::can_cache() ) return FALSE;
    if( is_object($this->_driver) ) {
      return $this->_driver->exists($key,$group);
    }
    return FALSE;
  }

  final public function erase($key,$group = '')
  {
    if( !self::can_cache() ) return FALSE;
    if( is_object($this->_driver) ) {
      return $this->_driver->erase($key,$group);
    }
    return FALSE;
  }

  final public function set($key,$value,$group = '')
  {
    if( !self::can_cache() ) return FALSE;
    if( is_object($this->_driver) ) {
      return $this->_driver->set($key,$value,$group);
    }
    return FALSE;
  }


  final public static function can_cache($type = 0)
  {
    global $CMS_ADMIN_PAGE;
    global $CMS_INSTALL_PAGE;
    global $CMS_MODULE_PAGE;
    global $CMS_STYLESHEET;

    if( isset($CMS_INSTALL_PAGE) ) return FALSE;
    if( isset($CMS_ADMIN_PAGE) ) return FALSE;
    if( isset($_SERVER['REQUEST_METHOD']) && strtoupper($_SERVER['REQUEST_METHOD']) == 'POST' ) return FALSE;

    $config = cmsms()->GetConfig();
    if( isset($config['debug']) && $config['debug'] == true ) return FALSE;

    $uid = get_userid(false);
    if( $uid ) return FALSE; // caching disabled for logged in administrators

    return TRuE;
  }
}

?>