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<?php
/**
* @version $Id$
* @package Koowa_Loader
* @copyright Copyright (C) 2007 - 2012 Johan Janssens. All rights reserved.
* @license GNU GPLv3 <http://www.gnu.org/licenses/gpl.html>
*/
require_once dirname(__FILE__).'/adapter/interface.php';
require_once dirname(__FILE__).'/adapter/abstract.php';
require_once dirname(__FILE__).'/adapter/koowa.php';
require_once dirname(__FILE__).'/registry.php';
/**
* KLoader class
*
* @author Johan Janssens <johan@nooku.org>
* @package Koowa_Loader
*/
class KLoader
{
/**
* The file container
*
* @var array
*/
protected $_registry = null;
/**
* Adapter list
*
* @var array
*/
protected static $_adapters = array();
/**
* Prefix map
*
* @var array
*/
protected static $_prefix_map = array();
/**
* Constructor
*
* Prevent creating instances of this class by making the contructor private
*/
final private function __construct($config = array())
{
//Create the class registry
$this->_registry = new KLoaderRegistry();
if(isset($config['cache_prefix'])) {
$this->_registry->setCachePrefix($config['cache_prefix']);
}
if(isset($config['cache_enabled'])) {
$this->_registry->enableCache($config['cache_enabled']);
}
//Add the koowa class loader
$this->addAdapter(new KLoaderAdapterKoowa(
array('basepath' => dirname(dirname(__FILE__)))
));
//Auto register the loader
$this->register();
}
/**
* Clone
*
* Prevent creating clones of this class
*/
final private function __clone() { }
/**
* Singleton instance
*
* @param array An optional array with configuration options.
* @return KLoader
*/
public static function getInstance($config = array())
{
static $instance;
if ($instance === NULL) {
$instance = new self($config);
}
return $instance;
}
/**
* Registers this instance as an autoloader.
*
* @return void
*/
public function register()
{
spl_autoload_register(array($this, 'loadClass'));
if (function_exists('__autoload')) {
spl_autoload_register('__autoload');
}
}
/**
* Get the class registry object
*
* @return object KLoaderRegistry
*/
public function getRegistry()
{
return $this->_registry;
}
/**
* Add a loader adapter
*
* @param object A KLoaderAdapter
* @return void
*/
public static function addAdapter(KLoaderAdapterInterface $adapter)
{
self::$_adapters[$adapter->getType()] = $adapter;
self::$_prefix_map[$adapter->getPrefix()] = $adapter->getType();
}
/**
* Get the registered adapters
*
* @return array
*/
public static function getAdapters()
{
return self::$_adapters;
}
/**
* Load a class based on a class name
*
* @param string The class name
* @param string The basepath
* @return boolean Returns TRUE on success throws exception on failure
*/
public function loadClass($class, $basepath = null)
{
$result = false;
//Extra filter added to circomvent issues with Zend Optimiser and strange classname.
if((ctype_upper(substr($class, 0, 1)) || (strpos($class, '.') !== false)))
{
//Pre-empt further searching for the named class or interface.
//Do not use autoload, because this method is registered with
//spl_autoload already.
if (!class_exists($class, false) && !interface_exists($class, false))
{
//Get the path
$path = self::findPath( $class, $basepath );
if ($path !== false) {
$result = self::loadFile($path);
}
}
else $result = true;
}
return $result;
}
/**
* Load a class based on an identifier
*
* @param string|object The identifier or identifier object
* @return boolean Returns TRUE on success throws exception on failure
*/
public function loadIdentifier($identifier)
{
$result = false;
$identifier = KService::getIdentifier($identifier);
//Get the path
$path = $identifier->filepath;
if ($path !== false) {
$result = self::loadFile($path);
}
return $result;
}
/**
* Load a class based on a path
*
* @param string The file path
* @return boolean Returns TRUE on success throws exception on failure
*/
public function loadFile($path)
{
$result = false;
//Don't re-include files and stat the file if it exists.
//Realpath is needed to resolve symbolic links.
if (!in_array(realpath($path), get_included_files()) && file_exists($path))
{
if ($included = include $path) {
$result = true;
}
}
return $result;
}
/**
* Get the path based on a class name
*
* @param string The class name
* @param string The basepath
* @return string Returns canonicalized absolute pathname
*/
public function findPath($class, $basepath = null)
{
static $base;
//Switch the base
$base = $basepath ? $basepath : $base;
if(!$this->_registry->offsetExists($base.'-'.(string) $class))
{
$result = false;
$word = preg_replace('/(?<=\\w)([A-Z])/', ' \\1', $class);
$parts = explode(' ', $word);
if(isset(self::$_prefix_map[$parts[0]]))
{
$result = self::$_adapters[self::$_prefix_map[$parts[0]]]->findPath( $class, $basepath);
if ($result !== false)
{
//Get the canonicalized absolute pathname
$path = realpath($result);
$result = $path !== false ? $path : $result;
}
$this->_registry->offsetSet($base.'-'.(string) $class, $result);
}
} else $result = $this->_registry->offsetGet($base.'-'.(string)$class);
return $result;
}
}
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