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<?php
/**
* Includes the Autoloader used.
* @package Templately
*/
namespace Templately;
// if direct access than exit the file.
defined('ABSPATH') || exit;
class Autoloader {
/**
* Instance of Autoloader
* @var Autoloader
*/
private static $_instance = null;
/**
* Classes map.
* Maps classes to file names.
* @access private
* @static
* @var array Classes array use by Templately.
*/
private static $classes_map;
/**
* Classes directory.
* Maps classes to file names.
* @access private
* @static
* Classes folder used for @package Templately.
*/
private static $SOURCE_DIRECTORY = TEMPLATELY_PATH;
/**
* Classmap file for Autoloader
* @access private
* @static
* Classes array used for @package Templately.
*/
private static $CLASS_MAPS_FILE = __DIR__ . '/classmaps.php';
/**
* Get a single instace of Autoloader
* @return Autoloader
*/
public static function init() {
if (is_null(self::$_instance)) {
self::$_instance = new self();
}
return self::$_instance;
}
/**
* Automatically get invoked when initilize the Autoloader.
*/
public function __construct() {
spl_autoload_register(array(&$this, 'autoload'));
}
/**
* Autoload function ensure that, every class you called is loaded properly.
* @param Object $class
* @access private
* @return void
*/
private function autoload($class) {
if (0 !== strpos($class, __NAMESPACE__ . '\\')) {
return;
}
$relative_class_name = preg_match( '/.*\\\\([\\w]+)/', $class, $matches );
if( count( $matches ) > 1 ){
$relative_class_name = $matches[1];
}
if( ! class_exists( $class ) ){
self::load_class( $relative_class_name );
}
}
/**
* Load class.
*
* For a given class name, require the class file.
*
* @access private
* @static
* @param string $relative_class_name Class name.
*/
private static function load_class($relative_class_name) {
$classes_map = self::get_classes_map();
if (isset($classes_map[ $relative_class_name ])) {
$filename = self::$SOURCE_DIRECTORY . $classes_map[ $relative_class_name ];
if (is_readable($filename)) {
require $filename;
}
}
}
/**
* Get the class map, if its not set than load the classmap file.
* @return void
*/
private static function get_classes_map() {
if (!self::$classes_map) {
self::init_classes_map();
}
return self::$classes_map;
}
/**
* Loader of the classmap file.
* @return array of classes.
*/
private static function init_classes_map() {
self::$classes_map = require_once self::$CLASS_MAPS_FILE;
}
}