@Override
 public void setPreview(Boolean preview) {
   if (previewable == null) {
     previewable = new PreviewStatus();
   }
   previewable.setPreview(preview);
 }
 @Override
 public Boolean getPreview() {
   if (previewable == null) {
     previewable = new PreviewStatus();
   }
   return previewable.getPreview();
 }