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é©¤&‡ïDbàÁôMÁ.<?php

namespace Nextend;

class Autoloader {

    private static $instance = null;

    private $aliases = array(
        'N2Data'              => '\\Nextend\\Framework\\Data\\Data',
        'N2SmartSliderBackup' => '\\Nextend\\SmartSlider3\\BackupSlider\\BackupData',
        'N2SmartSliderImport' => '\\Nextend\\SmartSlider3\\BackupSlider\\ImportSlider',
        'N2SmartSliderExport' => '\\Nextend\\SmartSlider3\\BackupSlider\\ExportSlider',
    );

    /**
     * An associative array where the key is a namespace prefix and the value
     * is an array of base directories for classes in that namespace.
     *
     * @var array
     */
    protected $prefixes = array();

    public function __construct() {
        $this->addNamespace('Nextend\\', dirname(__FILE__));


        $this->register();

        $currentPath = dirname(__FILE__) . '/';
        foreach (scandir($currentPath) as $file) {
            if ($file == '.' || $file == '..') continue;
            $path = $currentPath . $file;
            if (is_dir($path)) {

                $className = '\\Nextend\\' . $file . '\\' . $file;

                if (class_exists($className) && is_callable(array(
                        $className,
                        'getInstance'
                    ))) {
                    call_user_func_array(array(
                        $className,
                        'getInstance'
                    ), array());
                }
            }
        }

        Nextend::getInstance();
    }

    public static function getInstance() {
        if (self::$instance == null) {
            self::$instance = new Autoloader();
        }

        return self::$instance;
    }

    /**
     * Register loader with SPL autoloader stack.
     *
     * @return void
     */
    public function register() {
        spl_autoload_register(array(
            $this,
            'loadClass'
        ));
    }

    /**
     * Adds a base directory for a namespace prefix.
     *
     * @param string $prefix   The namespace prefix.
     * @param string $base_dir A base directory for class files in the
     *                         namespace.
     * @param bool   $prepend  If true, prepend the base directory to the stack
     *                         instead of appending it; this causes it to be searched first rather
     *                         than last.
     *
     * @return void
     */
    public function addNamespace($prefix, $base_dir, $prepend = false) {
        // normalize namespace prefix
        $prefix = trim($prefix, '\\') . '\\';

        // normalize the base directory with a trailing separator
        $base_dir = rtrim($base_dir, DIRECTORY_SEPARATOR) . '/';

        // initialize the namespace prefix array
        if (isset($this->prefixes[$prefix]) === false) {
            $this->prefixes[$prefix] = array();
        }

        // retain the base directory for the namespace prefix
        if ($prepend) {
            array_unshift($this->prefixes[$prefix], $base_dir);
        } else {
            array_push($this->prefixes[$prefix], $base_dir);
        }
    }

    /**
     * Loads the class file for a given class name.
     *
     * @param string $class The fully-qualified class name.
     *
     * @return mixed The mapped file name on success, or boolean false on
     * failure.
     */
    public function loadClass($class) {
        // the current namespace prefix
        $prefix = $class;

        // work backwards through the namespace names of the fully-qualified
        // class name to find a mapped file name
        while (false !== $pos = strrpos($prefix, '\\')) {

            // retain the trailing namespace separator in the prefix
            $prefix = substr($class, 0, $pos + 1);

            // the rest is the relative class name
            $relative_class = substr($class, $pos + 1);

            // try to load a mapped file for the prefix and relative class
            $mapped_file = $this->loadMappedFile($prefix, $relative_class);
            if ($mapped_file) {
                return $mapped_file;
            }

            // remove the trailing namespace separator for the next iteration
            // of strrpos()
            $prefix = rtrim($prefix, '\\');
        }

        if (isset($this->aliases[$class]) && class_exists($this->aliases[$class])) {
            /**
             * Create class alias for old class names
             */
            class_alias($this->aliases[$class], $class);

            return true;
        }

        // never found a mapped file
        return false;
    }

    /**
     * Load the mapped file for a namespace prefix and relative class.
     *
     * @param string $prefix         The namespace prefix.
     * @param string $relative_class The relative class name.
     *
     * @return mixed Boolean false if no mapped file can be loaded, or the
     * name of the mapped file that was loaded.
     */
    protected function loadMappedFile($prefix, $relative_class) {
        // are there any base directories for this namespace prefix?
        if (isset($this->prefixes[$prefix]) === false) {
            return false;
        }

        // look through base directories for this namespace prefix
        foreach ($this->prefixes[$prefix] as $base_dir) {

            // replace the namespace prefix with the base directory,
            // replace namespace separators with directory separators
            // in the relative class name, append with .php
            $file = $base_dir . str_replace('\\', '/', $relative_class) . '.php';

            // if the mapped file exists, require it
            if ($this->requireFile($file)) {
                // yes, we're done
                return $file;
            }
        }

        // never found it
        return false;
    }

    /**
     * If a file exists, require it from the file system.
     *
     * @param string $file The file to require.
     *
     * @return bool True if the file exists, false if not.
     */
    protected function requireFile($file) {
        if (file_exists($file)) {
            require $file;

            return true;
        }

        return false;
    }
}

Autoloader::getInstance();