/// <returns> A good old 1.4 Scorer /// </returns> public virtual Scorer Scorer(IndexReader reader) { // First see if the (faster) ConjunctionScorer will work. This can be // used when all clauses are required. Also, at this point a // BooleanScorer cannot be embedded in a ConjunctionScorer, as the hits // from a BooleanScorer are not always sorted by document number (sigh) // and hence BooleanScorer cannot implement skipTo() correctly, which is // required by ConjunctionScorer. bool allRequired = true; bool noneBoolean = true; for (int i = 0; i < weights.Count; i++) { BooleanClause c = (BooleanClause)Enclosing_Instance.clauses[i]; if (!c.IsRequired()) { allRequired = false; } if (c.GetQuery() is BooleanQuery) { noneBoolean = false; } } if (allRequired && noneBoolean) { // ConjunctionScorer is okay ConjunctionScorer result = new ConjunctionScorer(similarity); for (int i = 0; i < weights.Count; i++) { Weight w = (Weight)weights[i]; Scorer subScorer = w.Scorer(reader); if (subScorer == null) { return(null); } result.Add(subScorer); } return(result); } // Use good-old BooleanScorer instead. BooleanScorer result2 = new BooleanScorer(similarity); for (int i = 0; i < weights.Count; i++) { BooleanClause c = (BooleanClause)Enclosing_Instance.clauses[i]; Weight w = (Weight)weights[i]; Scorer subScorer = w.Scorer(reader); if (subScorer != null) { result2.Add(subScorer, c.IsRequired(), c.IsProhibited()); } else if (c.IsRequired()) { return(null); } } return(result2); }
public virtual Explanation Explain(IndexReader reader, int doc) { Explanation sumExpl = new Explanation(); sumExpl.SetDescription("sum of:"); int coord = 0; int maxCoord = 0; float sum = 0.0f; for (int i = 0; i < weights.Count; i++) { BooleanClause c = (BooleanClause)Enclosing_Instance.clauses[i]; Weight w = (Weight)weights[i]; Explanation e = w.Explain(reader, doc); if (!c.IsProhibited()) { maxCoord++; } if (e.GetValue() > 0) { if (!c.IsProhibited()) { sumExpl.AddDetail(e); sum += e.GetValue(); coord++; } else { return(new Explanation(0.0f, "match prohibited")); } } else if (c.IsRequired()) { return(new Explanation(0.0f, "match required")); } } sumExpl.SetValue(sum); if (coord == 1) { // only one clause matched sumExpl = sumExpl.GetDetails()[0]; // eliminate wrapper } float coordFactor = similarity.Coord(coord, maxCoord); if (coordFactor == 1.0f) { // coord is no-op return(sumExpl); } // eliminate wrapper else { Explanation result = new Explanation(); result.SetDescription("product of:"); result.AddDetail(sumExpl); result.AddDetail(new Explanation(coordFactor, "coord(" + coord + "/" + maxCoord + ")")); result.SetValue(sum * coordFactor); return(result); } }