code: public function getPreview(MediaInterface $media, array $options = null)
      {
          $self_options = array(
              'html' => array(
                  'class' => array(self::NAME),
                  'alt' => ''
              ));
  
          if (is_array($options)) {
              $options = array_merge($self_options, $options);
          } else {
              $options = $self_options;
          }
  
          $class = (isset($options['html']['class']) ? $options['html']['class'] : "");
  
          if(is_array($class))
              $class = implode(' ',$class);
          elseif(!is_string($class))
              $class = '';
  
          $alt = (isset($options['html']['alt']) ? $options['html']['alt'] : "");
  
          $html = '<img src="/media/' . $media->getMediaTypeReference() . '" class="' . $class . '" alt="' . $alt . '"  />';
  
          return $html;
      }
docs: @param MediaInterface $media
  @param array|null $options
  
  @return string