public LowerCaseFilter(TokenStream in) 
{
    super(in);
}

 public final Token next(Token result) throws IOException 
{
    result = input.next(result);
    if (result != null) {
      final char[] buffer = result.termBuffer();
      final int length = result.termLength;
      for(int i=0;i< length;i++)
        buffer[i] = Character.toLowerCase(buffer[i]);
      return result;
    } else
      return null;
}