diff --git a/lib/Tools/File.php b/lib/Tools/File.php
index a763243..f0432a8 100644
--- a/lib/Tools/File.php
+++ b/lib/Tools/File.php
@@ -6,6 +6,8 @@ class File
 {
 
     private $dirName;
+    private $suffix;
+    private $files;
 
     //$dir_name = iconv("utf-8", "gb2312", $dir_name);
 
@@ -14,11 +16,6 @@ class File
 
         $this->dirName = $dirname;
         $this->suffix = $suffix;
-
-        if (!is_dir($dirname)) {
-            throw new \Exception("directory ${dirname} doesn't exit");
-        }
-
     }
 
     public static function create($dir, $suffix)
@@ -26,34 +23,42 @@ class File
         return new static($dir, $suffix);
     }
 
+    public function getFiles()
+    {
+        return $this->files;
+    }
+
     public function scandir($recursive = false)
     {
+        if (!is_dir($this->dirName)) {
+            throw new \Exception("directory {$this->dirName} doesn't exist");
+        }
+
         if ($recursive) {
-            return $this->scandirRecursive();
+            $this->files = $this->scandirRecursive();
+            return $this->files;
         }
 
         $files = \glob($this->dirName . DIRECTORY_SEPARATOR . "*.{$this->suffix}");
-        $this->Files = $files;
+        $this->files = $files;
         return $files;
     }
 
     protected function scandirRecursive()
     {
-
         $directory = new \RecursiveDirectoryIterator($this->dirName);
         $iterator = new \RecursiveIteratorIterator($directory);
         $iterators = new \RegexIterator($iterator, '/.*\.' . $this->suffix . '$/', \RegexIterator::GET_MATCH);
 
-        $files = array();
         foreach ($iterators as $info) {
             if ($info) {
-                $files[] = reset($info);
+                yield reset($info);
             }
         }
-        $this->Files = $files;
-        return $files;
     }
-    public function getBasename($file){
-        return basename($file,".".$this->suffix);
+
+    static public function getBasename($file)
+    {
+        return pathinfo($file, PATHINFO_FILENAME);
     }
 }
diff --git a/lib/Tools/Helper.php b/lib/Tools/Helper.php
index 1e4ebdd..907ec53 100644
--- a/lib/Tools/Helper.php
+++ b/lib/Tools/Helper.php
@@ -354,7 +354,7 @@ class Helper
         $files = $filetool->scandir();
         $sites = [];
         foreach ($files as $file) {
-            $basename = $filetool->getBasename($file);
+            $basename = File::getBasename($file);
             $namespace = 'OCA\\NCDownloader\\Search\\Sites\\';
             $className = $namespace . $basename;
             if (in_array(searchInterface::class, class_implements($className))) {