class Variables implements IVariables {

  @Override
  public String fieldSubstitute( String aString, IRowMeta rowMeta, Object[] rowData )
    throws HopValueException {
    if ( aString == null || aString.length() == 0 ) {
      return aString;
    }

    return StringUtil.substituteField( aString, rowMeta, rowData );
  }

  public  Variables();

}