private void appendRestrictedContentType(ContentType contentType){
  if (restrictedContentTypesMask == 0) {
    restrictedContentTypesMask=contentType.getFlagValue();
  }
 else {
    restrictedContentTypesMask|=contentType.getFlagValue();
  }
}

private void appendRestrictedContentType ( ContentType contentType ) { if ( restrictedContentTypesMask == 0 ) { restrictedContentTypesMask = contentType . getFlagValue ( ) ; } else { restrictedContentTypesMask |= contentType . getFlagValue ( ) ; } }
appends new content type to restricted list ( depending on the current restricted content types )
