Examples of org.apache.lucene.search.Scorer$ScorerVisitor

org.apache.lucene.search.Scorer
A callback to gather information from a scorer and its sub-scorers. Each the top-level scorer as well as each of its sub-scorers are passed to either one of the visit methods depending on their boolean relationship in the query. @lucene.experimental

   * time.
   * Should not be used when the queue is empty.
   */
  public final Scorer pop() {
    // assert size > 0;
    Scorer result = topHSD.scorer;
    popNoResult();
    return result;
  }

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   * time.
   * Should not be used when the queue is empty.
   */
  public final Scorer pop() {
    // assert size > 0;
    Scorer result = topHSD.scorer;
    popNoResult();
    return result;
  }

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      // Pass true for "scoresDocsInOrder", because we
      // require in-order scoring, even if caller does not,
      // since we call advance on the valSrcScorers.  Pass
      // false for "topScorer" because we will not invoke
      // score(Collector) on these scorers:
      Scorer subQueryScorer = subQueryWeight.scorer(reader, true, false);
      if (subQueryScorer == null) {
        return null;
      }
      Scorer[] valSrcScorers = new Scorer[valSrcWeights.length];
      for(int i = 0; i < valSrcScorers.length; i++) {

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      public Similarity getSimilarity(Searcher s) {
        return sim;
      }
    };


    Scorer spanScorer = snq.weight(searcher).scorer(searcher.getIndexReader(), true, false);


    assertTrue("first doc", spanScorer.nextDoc() != DocIdSetIterator.NO_MORE_DOCS);
    assertEquals("first doc number", spanScorer.docID(), 11);
    float score = spanScorer.score();
    assertTrue("first doc score should be zero, " + score, score == 0.0f);
    assertTrue("no second doc", spanScorer.nextDoc() == DocIdSetIterator.NO_MORE_DOCS);
  }

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   * this causes problems
   */
  public void testSpanNearScorerSkipTo1() throws Exception {
    SpanNearQuery q = makeQuery();
    Weight w = q.weight(searcher);
    Scorer s = w.scorer(searcher.getIndexReader(), true, false);
    assertEquals(1, s.advance(1));
  }

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   * this causes problems
   */
  public void testSpanNearScorerExplain() throws Exception {
    SpanNearQuery q = makeQuery();
    Weight w = q.weight(searcher);
    Scorer s = w.scorer(searcher.getIndexReader(), true, false);
    Explanation e = s.explain(1);
    assertTrue("Scorer explanation value for doc#1 isn't positive: "
               + e.toString(),
               0.0f < e.getValue());
  }

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    while(iter.hasNext()) {
      Entry entry = (Entry) iter.next();
      Query query = (Query) entry.getKey();
      int limit = ((Integer) entry.getValue()).intValue();
      Weight weight = query.weight(searcher);
      Scorer scorer = weight.scorer(reader, true, false);
      if (scorer != null) {
        while(true)  {
          int doc = scorer.nextDoc();
          if (((long) docIDStart) + doc >= limit)
            break;
          reader.deleteDocument(doc);
          any = true;
        }

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  /**
   * <code>context</code> must contain a key "scorer" which is a {@link Scorer}.
   */
  @Override
  public FunctionValues getValues(Map context, AtomicReaderContext readerContext) throws IOException {
    Scorer v = (Scorer) context.get("scorer");
    if (v == null) {
      throw new IllegalStateException("Expressions referencing the score can only be used for sorting");
    }
    return new ScoreFunctionValues(this, v);
  }

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      queryWeight = topLevelBoost * getBoost();
    }


    @Override
    public Scorer scorer(AtomicReaderContext context, Bits acceptDocs) throws IOException {
      Scorer subQueryScorer = subQueryWeight.scorer(context, acceptDocs);
      if (subQueryScorer == null) {
        return null;
      }
      Scorer[] valSrcScorers = new Scorer[valSrcWeights.length];
      for(int i = 0; i < valSrcScorers.length; i++) {

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    // NOTE: acceptDocs applies (and is checked) only in the
    // child document space
    @Override
    public Scorer scorer(AtomicReaderContext readerContext, Bits acceptDocs) throws IOException {


      final Scorer parentScorer = parentWeight.scorer(readerContext, null);


      if (parentScorer == null) {
        // No matches
        return null;
      }

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