private String getInvokeScript()
      throws IOException {
    if (invokeScript == null) {
      invokeScript = IOUtils.toString(new AutoCloseInputStream(UglifyJs.class.getResourceAsStream("invoke.js")));
    }
    return invokeScript;
  }
private String getInvokeScript ( ) throws IOException { if ( invokeScript == null ) { invokeScript = IOUtils . toString ( new AutoCloseInputStream ( UglifyJs . class . getResourceAsStream ( "invoke.js" ) ) ) ; } return invokeScript ; }
@return the script responsible for invoking the uglifyJs script.