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

org.apache.lucene.search.Scorer
A child Scorer and its relationship to its parent. the meaning of the relationship depends upon the parent query. @lucene.experimental

      // 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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        // Sort drill-downs by most restrictive first:
        Arrays.sort(dims);


        // TODO: it could be better if we take acceptDocs
        // into account instead of baseScorer?
        Scorer baseScorer = baseWeight.scorer(context, scoreDocsInOrder, false, acceptDocs);


        if (baseScorer == null) {
          return null;
        }

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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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    @Override
    public Scorer scorer(AtomicReaderContext readerContext, boolean scoreDocsInOrder,
        boolean topScorer, Bits acceptDocs) throws IOException {


      // Pass scoreDocsInOrder true, topScorer false to our sub and the live docs:
      final Scorer childScorer = childWeight.scorer(readerContext, true, false, readerContext.reader().getLiveDocs());


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


      final int firstChildDoc = childScorer.nextDoc();
      if (firstChildDoc == DocIdSetIterator.NO_MORE_DOCS) {
        // No matches
        return null;
      }

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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(context, true, false, acceptDocs);
      if (subQueryScorer == null) {
        return null;
      }
      Scorer[] valSrcScorers = new Scorer[valSrcWeights.length];
      for(int i = 0; i < valSrcScorers.length; i++) {

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    @Override
    public Scorer scorer(AtomicReaderContext readerContext, boolean scoreDocsInOrder,
        boolean topScorer, Bits acceptDocs) throws IOException {


      // Pass scoreDocsInOrder true, topScorer false to our sub:
      final Scorer parentScorer = parentWeight.scorer(readerContext, true, false, null);


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

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          return 0.0f;
        }
      };
  
      final Similarity oldSim = searcher.getSimilarity();
      Scorer spanScorer;
      try {
        searcher.setSimilarity(sim);
        SpanNearQuery snq = new SpanNearQuery(
                                new SpanQuery[] {
                                  makeSpanTermQuery("t1"),
                                  makeSpanTermQuery("t2") },
                                slop,
                                ordered);
  
        spanScorer = searcher.createNormalizedWeight(snq).scorer(ctx, true, false, ctx.reader().getLiveDocs());
      } finally {
        searcher.setSimilarity(oldSim);
      }
      if (i == subIndex) {
        assertTrue("first doc", spanScorer.nextDoc() != DocIdSetIterator.NO_MORE_DOCS);
        assertEquals("first doc number", spanScorer.docID() + ctx.docBase, 11);
        float score = spanScorer.score();
        assertTrue("first doc score should be zero, " + score, score == 0.0f);
      }  else {
        assertTrue("no second doc", spanScorer.nextDoc() == DocIdSetIterator.NO_MORE_DOCS);
      }
    }
  }

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  public void testSpanNearScorerSkipTo1() throws Exception {
    SpanNearQuery q = makeQuery();
    Weight w = searcher.createNormalizedWeight(q);
    IndexReaderContext topReaderContext = searcher.getTopReaderContext();
    AtomicReaderContext leave = topReaderContext.leaves().get(0);
    Scorer s = w.scorer(leave, true, false, leave.reader().getLiveDocs());
    assertEquals(1, s.advance(1));
  }

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    DirectoryTaxonomyReader taxo = new DirectoryTaxonomyReader(taxoDir);


    ValueSource valueSource = new ValueSource() {
      @Override
      public FunctionValues getValues(@SuppressWarnings("rawtypes") Map context, AtomicReaderContext readerContext) throws IOException {
        final Scorer scorer = (Scorer) context.get("scorer");
        assert scorer != null;
        return new DoubleDocValues(this) {
          @Override
          public double doubleVal(int document) {
            try {
              return scorer.score();
            } catch (IOException exception) {
              throw new RuntimeException(exception);
            }
          }
        };

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    public ScoreValueSource() {
    }


    @Override
    public FunctionValues getValues(@SuppressWarnings("rawtypes") Map context, AtomicReaderContext readerContext) throws IOException {
      final Scorer scorer = (Scorer) context.get("scorer");
      if (scorer == null) {
        throw new IllegalStateException("scores are missing; be sure to pass keepScores=true to FacetsCollector");
      }
      return new DoubleDocValues(this) {
        @Override
        public double doubleVal(int document) {
          try {
            return scorer.score();
          } catch (IOException exception) {
            throw new RuntimeException(exception);
          }
        }
      };

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