Examples of org.apache.lucene.search.Explanation

org.apache.lucene.search.Explanation
Expert: Describes the score computation for document and query.

      for (final Weight w : weights) {
        final NodeBooleanClause c = cIter.next();
        if (w.scorer(context, true, true, context.reader().getLiveDocs()) == null) {
          if (c.isRequired()) {
            fail = true;
            final Explanation r = new Explanation(0.0f, "no match on required " +
                "clause (" + c.getQuery().toString() + ")");
            sumExpl.addDetail(r);
          }
          continue;
        }
        final Explanation e = w.explain(context, doc);
        if (e.isMatch()) {
          if (!c.isProhibited()) {
            sumExpl.addDetail(e);
            sum += e.getValue();
            coord++;
          }
          else {
            final Explanation r =
              new Explanation(0.0f, "match on prohibited clause (" +
                c.getQuery().toString() + ")");
            r.addDetail(e);
            sumExpl.addDetail(r);
            fail = true;
          }
        }
        else if (c.isRequired()) {
          final Explanation r = new Explanation(0.0f, "no match on required " +
              "clause (" + c.getQuery().toString() + ")");
          r.addDetail(e);
          sumExpl.addDetail(r);
          fail = true;
        }
      }
      if (fail) {

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          result.setDescription("weight("+this.getQuery()+" in "+doc+") [" + similarity.getClass().getSimpleName() + "], result of:");
          while (scorer.nextNode()) {
            final ComplexExplanation nodeMatch = new ComplexExplanation();
            nodeMatch.setDescription("in "+scorer.node()+"), result of:");
            final float freq = scorer.freqInNode();
            final Explanation scoreExplanation = docScorer.explain(doc, new Explanation(freq, "phraseFreq=" + freq));
            nodeMatch.setValue(scoreExplanation.getValue());
            nodeMatch.setMatch(true);
            nodeMatch.addDetail(scoreExplanation);
            result.addDetail(nodeMatch);
          }
          result.setMatch(true);

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    throws IOException {
      final LuceneProxyNodeScorer dScorer = (LuceneProxyNodeScorer) this.scorer(context, true, false, context.reader().getLiveDocs());


      if (dScorer != null) {
        if (dScorer.advance(doc) != DocIdSetIterator.NO_MORE_DOCS && dScorer.docID() == doc) {
          final Explanation exp = dScorer.getWeight().explain(context, doc);
          exp.setValue(dScorer.score());
          return exp;
        }
      }
      return new ComplexExplanation(false, 0.0f, "no matching term");
    }

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      final ComplexExplanation result = new ComplexExplanation();
      if (exists) {
        result.setDescription(NodeConstantScoreQuery.this.toString() + ", product of:");
        result.setValue(queryWeight);
        result.setMatch(Boolean.TRUE);
        result.addDetail(new Explanation(NodeConstantScoreQuery.this.getBoost(), "boost"));
        result.addDetail(new Explanation(queryNorm, "queryNorm"));
      } else {
        result.setDescription(NodeConstantScoreQuery.this.toString() + " doesn't match id " + doc);
        result.setValue(0);
        result.setMatch(Boolean.FALSE);
      }

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    this.setAnalyzer(AnalyzerType.JSON);


    this.addDocument("{\"aaa\" : \"bbb\"}");


    Query query = ntq("aaa").getLuceneProxyQuery();
    final Explanation exp = searcher.explain(query, 0);
    assertTrue(exp.getValue() != 0);
  }

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    final Query query = npq("renaud", "delbru").getLuceneProxyQuery();


    final Weight w = query.createWeight(searcher);


    // Explain entity 0 : 1 match
    Explanation explanation = w.explain((AtomicReaderContext) reader.getContext(), 0);
    assertNotNull("explanation is null and it shouldn't be", explanation);


//    final Similarity sim = searcher.getSimilarity();
    // TODO: The similarity is randomly set
//     System.out.println("Explanation: " + explanation.toString());
//    //All this Explain does is return the term frequency
//    assertEquals("term frq is not 1",
//      sim.tf(1), explanation.getDetails()[1].getDetails()[0].getValue(), 0.01);


    // Explain entity 1 : 2 match
    explanation = w.explain((AtomicReaderContext) reader.getContext(), 1);
    assertNotNull("explanation is null and it shouldn't be", explanation);
    // TODO: The similarity is randomly set
//     System.out.println("Explanation: " + explanation.toString());
//    //All this Explain does is return the term frequency
//    assertEquals("term frq is not 2",
//      sim.tf(2), explanation.getDetails()[1].getDetails()[0].getValue(), 0f);


    // Explain non existing entity
    explanation = w.explain((AtomicReaderContext) reader.getContext(), 2);
    assertNotNull("explanation is null and it shouldn't be", explanation);
//    System.out.println("Explanation: " + explanation.toString());
    //All this Explain does is return the term frequency
    assertEquals("term frq is not 0", 0f, explanation.getValue(), 0f);
  }

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    final Weight w = searcher.createNormalizedWeight(query);
    assertTrue(searcher.getTopReaderContext() instanceof AtomicReaderContext);
    final AtomicReaderContext context = (AtomicReaderContext) searcher.getTopReaderContext();


    // Explain entity 0
    Explanation explanation = w.explain(context, 0);
    assertNotNull("explanation is null and it shouldn't be", explanation);


    // TODO: the similarity is random
    // All this Explain does is return the term frequency
//    final float termFreq = explanation.getDetails()[0].getDetails()[0].getValue();
//    assertEquals("term frq is not 2", 2f, termFreq, 0f);


    // Explain non existing entity
    explanation = w.explain(context, 1);
    assertNotNull("explanation is null and it shouldn't be", explanation);
    //All this Explain does is return the term frequency
    assertEquals("term frq is not 0", 0f, explanation.getValue(), 0f);
  }

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    }
  }


  public Explanation explain(int documentId) {
    //don't use TimeoutManager here as explain is a dev tool when things are weird... or slow :)
    Explanation explanation = null;
    IndexSearcherWithPayload searcher = buildSearcher( searchFactoryImplementor, true );
    if ( searcher == null ) {
      throw new SearchException(
          "Unable to build explanation for document id:"
              + documentId + ". no index found"

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  public float score(int index) throws IOException {
    return scoreDoc( index ).score;
  }


  public Explanation explain(int index) throws IOException {
    final Explanation explanation = searcher.getSearcher().explain( preparedQuery, docId( index ) );
    timeoutManager.isTimedOut();
    return explanation;
  }

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      return super.score()
          * function.docScore(doc, fieldName, payloadsSeen, payloadScore);
    }


    public Explanation explain(int doc) throws IOException {
      Explanation result = new Explanation();
      Explanation nonPayloadExpl = super.explain(doc);
      result.addDetail(nonPayloadExpl);
      Explanation payloadBoost = new Explanation();
      result.addDetail(payloadBoost);
      float avgPayloadScore = (payloadsSeen > 0 ? (payloadScore / payloadsSeen)
          : 1);
      payloadBoost.setValue(avgPayloadScore);
      payloadBoost.setDescription("scorePayload(...)");
      result.setValue(nonPayloadExpl.getValue() * avgPayloadScore);
      result.setDescription("bnq, product of:");
      return result;
    }

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