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<?php

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namespace Nextend;

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class Autoloader {

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private static $instance = null;

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private $aliases = array(

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'N2Data' => '\\Nextend\\Framework\\Data\\Data',

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'N2SmartSliderBackup' => '\\Nextend\\SmartSlider3\\BackupSlider\\BackupData',

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'N2SmartSliderImport' => '\\Nextend\\SmartSlider3\\BackupSlider\\ImportSlider',

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'N2SmartSliderExport' => '\\Nextend\\SmartSlider3\\BackupSlider\\ExportSlider',

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);

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/**

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* An associative array where the key is a namespace prefix and the value

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* is an array of base directories for classes in that namespace.

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* @var array

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protected $prefixes = array();

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public function __construct() {

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$this->addNamespace('Nextend\\', dirname(__FILE__));

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$this->register();

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$currentPath = dirname(__FILE__) . '/';

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foreach (scandir($currentPath) as $file) {

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if ($file == '.' || $file == '..') continue;

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$path = $currentPath . $file;

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if (is_dir($path)) {

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

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if (class_exists($className) && is_callable(array(

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$className,

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'getInstance'

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))) {

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call_user_func_array(array(

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$className,

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'getInstance'

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), array());

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}

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}

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}

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Nextend::getInstance();

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}

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public static function getInstance() {

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if (self::$instance == null) {

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self::$instance = new Autoloader();

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}

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return self::$instance;

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}

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/**

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* Register loader with SPL autoloader stack.

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* @return void

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public function register() {

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spl_autoload_register(array(

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$this,

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'loadClass'

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));

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}

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/**

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* Adds a base directory for a namespace prefix.

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* @param string $prefix The namespace prefix.

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* @param string $base_dir A base directory for class files in the

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* namespace.

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* @param bool $prepend If true, prepend the base directory to the stack

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* instead of appending it; this causes it to be searched first rather

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* than last.

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* @return void

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public function addNamespace($prefix, $base_dir, $prepend = false) {

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// normalize namespace prefix

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$prefix = trim($prefix, '\\') . '\\';

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// normalize the base directory with a trailing separator

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$base_dir = rtrim($base_dir, DIRECTORY_SEPARATOR) . '/';

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// initialize the namespace prefix array

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if (isset($this->prefixes[$prefix]) === false) {

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$this->prefixes[$prefix] = array();

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}

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// retain the base directory for the namespace prefix

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if ($prepend) {

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array_unshift($this->prefixes[$prefix], $base_dir);

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} else {

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array_push($this->prefixes[$prefix], $base_dir);

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}

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}

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/**

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* Loads the class file for a given class name.

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* @param string $class The fully-qualified class name.

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* @return mixed The mapped file name on success, or boolean false on

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* failure.

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public function loadClass($class) {

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// the current namespace prefix

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$prefix = $class;

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// work backwards through the namespace names of the fully-qualified

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// class name to find a mapped file name

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while (false !== $pos = strrpos($prefix, '\\')) {

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// retain the trailing namespace separator in the prefix

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$prefix = substr($class, 0, $pos + 1);

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// the rest is the relative class name

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$relative_class = substr($class, $pos + 1);

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// try to load a mapped file for the prefix and relative class

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$mapped_file = $this->loadMappedFile($prefix, $relative_class);

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if ($mapped_file) {

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return $mapped_file;

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}

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// remove the trailing namespace separator for the next iteration

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// of strrpos()

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$prefix = rtrim($prefix, '\\');

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}

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if (isset($this->aliases[$class]) && class_exists($this->aliases[$class])) {

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/**

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* Create class alias for old class names

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class_alias($this->aliases[$class], $class);

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return true;

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}

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// never found a mapped file

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return false;

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}

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/**

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* Load the mapped file for a namespace prefix and relative class.

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* @param string $prefix The namespace prefix.

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* @param string $relative_class The relative class name.

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* @return mixed Boolean false if no mapped file can be loaded, or the

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* name of the mapped file that was loaded.

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protected function loadMappedFile($prefix, $relative_class) {

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// are there any base directories for this namespace prefix?

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if (isset($this->prefixes[$prefix]) === false) {

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return false;

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}

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// look through base directories for this namespace prefix

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foreach ($this->prefixes[$prefix] as $base_dir) {

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// replace the namespace prefix with the base directory,

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// replace namespace separators with directory separators

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// in the relative class name, append with .php

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$file = $base_dir . str_replace('\\', '/', $relative_class) . '.php';

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// if the mapped file exists, require it

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if ($this->requireFile($file)) {

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// yes, we're done

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return $file;

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}

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}

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// never found it

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return false;

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}

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/**

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* If a file exists, require it from the file system.

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* @param string $file The file to require.

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* @return bool True if the file exists, false if not.

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protected function requireFile($file) {

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if (file_exists($file)) {

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require $file;

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return true;

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}

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return false;

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}

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}

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Autoloader::getInstance();

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