<?php
/**
 * 2007-2014 [PagSeguro Internet Ltda.]
 *
 * NOTICE OF LICENSE
 *
 *Licensed under the Apache License, Version 2.0 (the "License");
 *you may not use this file except in compliance with the License.
 *You may obtain a copy of the License at
 *
 *http://www.apache.org/licenses/LICENSE-2.0
 *
 *Unless required by applicable law or agreed to in writing, software
 *distributed under the License is distributed on an "AS IS" BASIS,
 *WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *See the License for the specific language governing permissions and
 *limitations under the License.
 *
 *  @author    PagSeguro Internet Ltda.
 *  @copyright 2007-2014 PagSeguro Internet Ltda.
 *  @license   http://www.apache.org/licenses/LICENSE-2.0
 */

/**
 * Library autoloader - spl_autoload_register
 */
class PagSeguroAutoloader
{

    public static $loader;

    private static $dirs = array(
        'config',
        'resources',
        'log',
        'domain',
        'exception',
        'parser',
        'service',
        'utils',
        'helper'
    );

    private function __construct()
    {
        if (function_exists('__autoload')) {
            spl_autoload_register('__autoload');
        }
        spl_autoload_register(array($this, 'addClass'));
    }

    public static function init()
    {
        if (!function_exists('spl_autoload_register')) {
            throw new Exception("PagSeguroLibrary: Standard PHP Library (SPL) is required.");
        }
        if (self::$loader == null) {
            self::$loader = new PagSeguroAutoloader();
        }
        return self::$loader;
    }

    private function addClass($class)
    {
        foreach (self::$dirs as $key => $dir) {
            $file = PagSeguroLibrary::getPath() . DIRECTORY_SEPARATOR .
                $dir . DIRECTORY_SEPARATOR . $class . '.class.php';
            if (file_exists($file) && is_file($file)) {

                require_once $file;
            }
        }
    }
}
