Examples of org.apache.lucene.search.ComplexExplanation

org.apache.lucene.search.ComplexExplanation
Expert: Describes the score computation for document and query, andcan distinguish a match independent of a positive value.

    }


    public Explanation explain(int docBase) throws IOException {
      int start = docBase + prevParentDoc + 1; // +1 b/c prevParentDoc is previous parent doc
      int end = docBase + parentDoc - 1; // -1 b/c parentDoc is parent doc
      return new ComplexExplanation(
          true, score(), String.format(Locale.ROOT, "Score based on child doc range from %d to %d", start, end)
      );
    }

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    public Explanation explain(AtomicReaderContext context, int doc) throws IOException {
      BlockJoinScorer scorer = (BlockJoinScorer) scorer(context, true, false, context.reader().getLiveDocs());
      if (scorer != null && scorer.advance(doc) == doc) {
        return scorer.explain(context.docBase);
      }
      return new ComplexExplanation(false, 0.0f, "Not a match");
    }

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    }


    public Explanation explain(int docBase) throws IOException {
      int start = docBase + prevParentDoc + 1; // +1 b/c prevParentDoc is previous parent doc
      int end = docBase + parentDoc - 1; // -1 b/c parentDoc is parent doc
      return new ComplexExplanation(
          true, score(), String.format(Locale.ROOT, "Score based on child doc range from %d to %d", start, end)
      );
    }

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        if (scorer != null) {
          if (scorer.advanceForExplainOnly(doc) == doc) {
            return scorer.explain();
          }
        }
        return new ComplexExplanation(false, 0.0f, "Not a match");
      }


      @Override
      public Query getQuery() {
        return TermsIncludingScoreQuery.this;

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    public float score() throws IOException {
      return scores[ords[scoreUpto]];
    }


    Explanation explain() throws IOException {
      return new ComplexExplanation(true, score(), "Score based on join value " + termsEnum.term().utf8ToString());
    }

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      for(int i = 0; i < valSrcScorers.length; i++) {
        valSrcExpls[i] = valSrcScorers[i].explain(doc);
      }
      Explanation customExp = customExplain(doc,subQueryExpl,valSrcExpls);
      float sc = qWeight * customExp.getValue();
      Explanation res = new ComplexExplanation(
        true, sc, CustomScoreQuery.this.toString() + ", product of:");
      res.addDetail(customExp);
      res.addDetail(new Explanation(qWeight, "queryBoost")); // actually using the q boost as q weight (== weight value)
      return res;
    }

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  }


  public Explanation explain(IndexReader reader, int doc)
    throws IOException {


    ComplexExplanation result = new ComplexExplanation();
    result.setDescription("weight("+getQuery()+" in "+doc+"), product of:");
    String field = ((SpanQuery)getQuery()).getField();


    StringBuffer docFreqs = new StringBuffer();
    Iterator i = terms.iterator();
    while (i.hasNext()) {
      Term term = (Term)i.next();
      docFreqs.append(term.text());
      docFreqs.append("=");
      docFreqs.append(reader.docFreq(term));


      if (i.hasNext()) {
        docFreqs.append(" ");
      }
    }


    Explanation idfExpl =
      new Explanation(idf, "idf(" + field + ": " + docFreqs + ")");


    // explain query weight
    Explanation queryExpl = new Explanation();
    queryExpl.setDescription("queryWeight(" + getQuery() + "), product of:");


    Explanation boostExpl = new Explanation(getQuery().getBoost(), "boost");
    if (getQuery().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("+field+":"+query.toString(field)+
                             " 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;

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        return super.score() * (payloadsSeen > 0 ? (payloadScore / payloadsSeen) : 1);
      }




      public Explanation explain(final int doc) throws IOException {
        ComplexExplanation result = new ComplexExplanation();
        Explanation nonPayloadExpl = super.explain(doc);
        result.addDetail(nonPayloadExpl);
        //QUESTION: Is there a wau to avoid this skipTo call?  We need to know whether to load the payload or not
        
        Explanation payloadBoost = new Explanation();
        result.addDetail(payloadBoost);
/*
        if (skipTo(doc) == true) {
          processPayload();
        }
*/


        float avgPayloadScore =  (payloadsSeen > 0 ? (payloadScore / payloadsSeen) : 1); 
        payloadBoost.setValue(avgPayloadScore);
        //GSI: I suppose we could toString the payload, but I don't think that would be a good idea 
        payloadBoost.setDescription("scorePayload(...)");
        result.setValue(nonPayloadExpl.getValue() * avgPayloadScore);
        result.setDescription("btq, product of:");
        result.setMatch(nonPayloadExpl.getValue()==0 ? Boolean.FALSE : Boolean.TRUE); // LUCENE-1303
        return result;
      }

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    /*(non-Javadoc) @see org.apache.lucene.search.Scorer#explain(int) */
    public Explanation explain(int doc) throws IOException {
      float sc = qWeight * vals.floatVal(doc);


      Explanation result = new ComplexExplanation(
        true, sc, ValueSourceQuery.this.toString() + ", product of:");


      result.addDetail(vals.explain(doc));
      result.addDetail(new Explanation(getBoost(), "boost"));
      result.addDetail(new Explanation(weight.queryNorm,"queryNorm"));
      return result;
    }

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          expl.setValue(scoreExplanation.getValue());
          String field = ((SpanQuery)getQuery()).getField();
          // now the payloads part
          Explanation payloadExpl = function.explain(doc, field, scorer.payloadsSeen, scorer.payloadScore);
          // combined
          ComplexExplanation result = new ComplexExplanation();
          result.addDetail(expl);
          result.addDetail(payloadExpl);
          result.setValue(expl.getValue() * payloadExpl.getValue());
          result.setDescription("PayloadNearQuery, product of:");
          return result;
        }
      }
      
      return new ComplexExplanation(false, 0.0f, "no matching term");
    }

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