Pimcore\Document\Adapter\Ghostscript::isFileTypeSupported PHP Method

    public function isFileTypeSupported($fileType)
    {
        // it's also possible to pass a path or filename
        if (preg_match("/\\.?pdf\$/", $fileType)) {
            return true;
        }
        return false;
    }

 /**
  * @param null $page
  * @param null $path
  * @return bool|string
  * @throws \Exception
  */
 public function getText($page = null, $path = null)
 {
     $path = $path ? $this->preparePath($path) : $this->path;
     if ($page || parent::isFileTypeSupported($path)) {
         // for per page extraction we have to convert the document to PDF and extract the text via ghostscript
         return parent::getText($page, $this->getPdf($path));
     } elseif (File::getFileExtension($path)) {
         // if we want to get the text of the whole document, we can use libreoffices text export feature
         $cmd = self::getLibreOfficeCli() . " --headless --nologo --nofirststartwizard --norestore --convert-to txt:Text --outdir " . escapeshellarg(PIMCORE_TEMPORARY_DIRECTORY) . " " . escapeshellarg($path);
         $out = Console::exec($cmd, null, 240);
         Logger::debug("LibreOffice Output was: " . $out);
         $tmpName = PIMCORE_TEMPORARY_DIRECTORY . "/" . preg_replace("/\\." . File::getFileExtension($path) . "\$/", ".txt", basename($path));
         if (file_exists($tmpName)) {
             $text = file_get_contents($tmpName);
             $text = \Pimcore\Tool\Text::convertToUTF8($text);
             unlink($tmpName);
             return $text;
         } else {
             $message = "Couldn't convert document to PDF: " . $path . " with the command: '" . $cmd . "' - now trying to get the text out of the PDF ...";
             Logger::error($message);
             return parent::getText(null, $this->getPdf($path));
         }
     }
     return "";
     // default empty string
 }