public boolean isSupported(String fileName){
  String extension=getExtension(fileName);
  return isInternalSupported(extension) || isExternalSupported(extension);
}

public boolean isSupported ( String fileName ) { String extension = getExtension ( fileName ) ; return isInternalSupported ( extension ) || isExternalSupported ( extension ) ; }
check if the file is supported by the internal or external decompressor
