public Explanation explain(IndexReader reader, int doc) throws IOException { ComplexExplanation result = new ComplexExplanation(); result.setDescription("weight(" + getQuery() + " in " + doc + "), product of:"); Explanation idfExpl = new Explanation(idf, "idf(docFreq=" + reader.docFreq(term) + ")"); // explain query weight Explanation queryExpl = new Explanation(); queryExpl.setDescription("queryWeight(" + getQuery() + "), product of:"); Explanation boostExpl = new Explanation(getBoost(), "boost"); if (getBoost() != 1.0f) queryExpl.addDetail(boostExpl); queryExpl.addDetail(idfExpl); Explanation queryNormExpl = new Explanation(queryNorm, "queryNorm"); queryExpl.addDetail(queryNormExpl); queryExpl.setValue(boostExpl.getValue() * idfExpl.getValue() * queryNormExpl.getValue()); result.addDetail(queryExpl); // explain field weight String field = term.field(); ComplexExplanation fieldExpl = new ComplexExplanation(); fieldExpl.setDescription("fieldWeight(" + term + " in " + doc + "), product of:"); Explanation tfExpl = scorer(reader).explain(doc); fieldExpl.addDetail(tfExpl); fieldExpl.addDetail(idfExpl); Explanation fieldNormExpl = new Explanation(); byte[] fieldNorms = reader.norms(field); float fieldNorm = fieldNorms != null ? Similarity.decodeNorm(fieldNorms[doc]) : 0.0f; fieldNormExpl.setValue(fieldNorm); fieldNormExpl.setDescription("fieldNorm(field=" + field + ", doc=" + doc + ")"); fieldExpl.addDetail(fieldNormExpl); fieldExpl.setMatch(Boolean.valueOf(tfExpl.isMatch())); fieldExpl.setValue(tfExpl.getValue() * idfExpl.getValue() * fieldNormExpl.getValue()); result.addDetail(fieldExpl); result.setMatch(fieldExpl.getMatch()); // combine them result.setValue(queryExpl.getValue() * fieldExpl.getValue()); if (queryExpl.getValue() == 1.0f) return fieldExpl; return result; }
@Override public Explanation explain(AtomicReaderContext context, int doc) throws IOException { ComplexExplanation result = new ComplexExplanation(); result.setDescription("weight(" + getQuery() + " in " + doc + "), product of:"); Explanation idfExpl = new Explanation(idf, "idf(" + field + ":" + idfExp.explain() + ")"); // explain query weight Explanation queryExpl = new Explanation(); queryExpl.setDescription("queryWeight(" + getQuery() + "), product of:"); Explanation boostExpl = new Explanation(getBoost(), "boost"); if (getBoost() != 1.0f) queryExpl.addDetail(boostExpl); queryExpl.addDetail(idfExpl); Explanation queryNormExpl = new Explanation(queryNorm, "queryNorm"); queryExpl.addDetail(queryNormExpl); queryExpl.setValue(boostExpl.getValue() * idfExpl.getValue() * queryNormExpl.getValue()); result.addDetail(queryExpl); // explain field weight ComplexExplanation fieldExpl = new ComplexExplanation(); fieldExpl.setDescription("fieldWeight(" + getQuery() + " in " + doc + "), product of:"); Scorer scorer = scorer(context, ScorerContext.def()); if (scorer == null) { return new Explanation(0.0f, "no matching docs"); } Explanation tfExplanation = new Explanation(); int d = scorer.advance(doc); float phraseFreq; if (d == doc) { phraseFreq = scorer.freq(); } else { phraseFreq = 0.0f; } tfExplanation.setValue(similarity.tf(phraseFreq)); tfExplanation.setDescription("tf(phraseFreq=" + phraseFreq + ")"); fieldExpl.addDetail(tfExplanation); fieldExpl.addDetail(idfExpl); Explanation fieldNormExpl = new Explanation(); byte[] fieldNorms = context.reader.norms(field); float fieldNorm = fieldNorms != null ? similarity.decodeNormValue(fieldNorms[doc]) : 1.0f; fieldNormExpl.setValue(fieldNorm); fieldNormExpl.setDescription("fieldNorm(field=" + field + ", doc=" + doc + ")"); fieldExpl.addDetail(fieldNormExpl); fieldExpl.setMatch(Boolean.valueOf(tfExplanation.isMatch())); fieldExpl.setValue(tfExplanation.getValue() * idfExpl.getValue() * fieldNormExpl.getValue()); result.addDetail(fieldExpl); result.setMatch(fieldExpl.getMatch()); // combine them result.setValue(queryExpl.getValue() * fieldExpl.getValue()); if (queryExpl.getValue() == 1.0f) return fieldExpl; return result; }