/**
  * Perform actual minification
  *
  * @return void
  */
 protected function minify()
 {
     $isExists = $this->staticViewDir->isExist($this->path);
     if (!$isExists) {
         $shouldMinify = true;
     } elseif ($this->strategy == self::FILE_EXISTS) {
         $shouldMinify = false;
     } else {
         $origlFile = $this->rootDir->getRelativePath($this->originalAsset->getSourceFile());
         $origMtime = $this->rootDir->stat($origlFile)['mtime'];
         $minMtime = $this->staticViewDir->stat($this->path)['mtime'];
         $shouldMinify = $origMtime != $minMtime;
     }
     if ($shouldMinify) {
         $content = $this->adapter->minify($this->originalAsset->getContent());
         $this->staticViewDir->writeFile($this->path, $content);
     }
 }