Examples of org.apache.lucene.search.Weight.explain()

org.apache.lucene.search.Weight.explain()
An explanation of the score computation for the named document. @param context the readers context to create the {@link Explanation} for. @param doc the document's id relative to the given context's reader @return an Explanation for the score @throws IOException if an {@link IOException} occurs

    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());

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//    //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",

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//    //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();

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    // 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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    final Weight baseWeight = baseQuery.createWeight(searcher);


    return new Weight() {
      @Override
      public Explanation explain(AtomicReaderContext context, int doc) throws IOException {
        return baseWeight.explain(context, doc);
      }


      @Override
      public Query getQuery() {
        return baseQuery;

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    }


    return new Weight() {
      @Override
      public Explanation explain(AtomicReaderContext context, int doc) throws IOException {
        return baseWeight.explain(context, doc);
      }


      @Override
      public Query getQuery() {
        return baseQuery;

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    final Weight baseWeight = baseQuery.createWeight(searcher);


    return new Weight() {
      @Override
      public Explanation explain(AtomicReaderContext context, int doc) throws IOException {
        return baseWeight.explain(context, doc);
      }


      @Override
      public Query getQuery() {
        return baseQuery;

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    final Weight baseWeight = baseQuery.createWeight(searcher);


    return new Weight() {
      @Override
      public Explanation explain(AtomicReaderContext context, int doc) throws IOException {
        return baseWeight.explain(context, doc);
      }


      @Override
      public Query getQuery() {
        return baseQuery;

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    final Weight baseWeight = baseQuery.createWeight(searcher);


    return new Weight() {
      @Override
      public Explanation explain(AtomicReaderContext context, int doc) throws IOException {
        return baseWeight.explain(context, doc);
      }


      @Override
      public Query getQuery() {
        return baseQuery;

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