Review

class BooleanQuery.BooleanWeight {
    public float sumOfSquaredWeights() throws IOException {
      float sum = 0.0f;
      for (int i = 0 ; i < weights.size(); i++) {
        BooleanClause c = (BooleanClause)clauses.get(i);
        Weight w = (Weight)weights.elementAt(i);
        // call sumOfSquaredWeights for all clauses in case of side effects
        float s = w.sumOfSquaredWeights();         // sum sub weights
        if (!c.isProhibited())
          // only add to sum for non-prohibited clauses
          sum += s;
      }

      sum *= getBoost() * getBoost();             // boost each sub-weight

      return sum ;
    }

}