Review

class BooleanScorer2 {
  private Scorer countingConjunctionSumScorer(List requiredScorers) {
    // each scorer from the list counted as a single matcher
    final int requiredNrMatchers = requiredScorers.size();
    ConjunctionScorer cs = new ConjunctionScorer(defaultSimilarity) {
      private int lastScoredDoc = -1;

      public float score() throws IOException {
        if (this.doc() > lastScoredDoc) {
          lastScoredDoc = this.doc();
          coordinator.nrMatchers += requiredNrMatchers;
        }
        // All scorers match, so defaultSimilarity super.score() always has 1 as
        // the coordination factor.
        // Therefore the sum of the scores of the requiredScorers
        // is used as score.
        return super.score();
      }
    };
    Iterator rsi = requiredScorers.iterator();
    while (rsi.hasNext()) {
      cs.add((Scorer) rsi.next());
    }
    return cs;
  }

}