public KeywordAnalyzer() 
{
    setOverridesTokenStreamMethod(KeywordAnalyzer.class);
}

 public TokenStream reusableTokenStream(String fieldName,
    Reader reader) throws IOException 
{
    if (overridesTokenStreamMethod) {
      // LUCENE-1678: force fallback to tokenStream() if we
      // have been subclassed and that subclass overrides
      // tokenStream but not reusableTokenStream
      return tokenStream(fieldName, reader);
    }
    Tokenizer tokenizer = (Tokenizer) getPreviousTokenStream();
    if (tokenizer == null) {
      tokenizer = new KeywordTokenizer(reader);
      setPreviousTokenStream(tokenizer);
    } else
      tokenizer.reset(reader);
    return tokenizer;
}

 public TokenStream tokenStream(String fieldName,
    Reader reader) 
{
    return new KeywordTokenizer(reader);
}