Examples of org.apache.lucene.search.DocIdSet

org.apache.lucene.search.DocIdSet
A DocIdSet contains a set of doc ids. Implementing classes must only implement {@link #iterator} to provide access to the set.

      this.predicateValueSource = predicateValueSource;
    }


    @Override
    public DocIdSet getDocIdSet(final AtomicReaderContext context, final Bits acceptDocs) throws IOException {
      return new DocIdSet() {
        @Override
        public DocIdSetIterator iterator() throws IOException {
          throw new UnsupportedOperationException(
              "Iteration is too slow; instead try FilteredQuery.QUERY_FIRST_FILTER_STRATEGY");
          //Note that if you're truly bent on doing this, then see FunctionValues.getRangeScorer

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    };
  }


  private void tstFilterCard(String mes, int expected, Filter filt)
      throws Exception {
    final DocIdSet docIdSet = filt.getDocIdSet(reader.getContext(), reader.getLiveDocs());
    int actual = 0;
    if (docIdSet != null) {
      DocIdSetIterator disi = docIdSet.iterator();
      while (disi.nextDoc() != DocIdSetIterator.NO_MORE_DOCS) {
        actual++;
      }
    }
    assertEquals(mes, expected, actual);

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    final AtomicReaderContext readerContext = reader.getContext();
    boolean any = false;
    for (QueryAndLimit ent : queriesIter) {
      Query query = ent.query;
      int limit = ent.limit;
      final DocIdSet docs = new QueryWrapperFilter(query).getDocIdSet(readerContext, reader.getLiveDocs());
      if (docs != null) {
        final DocIdSetIterator it = docs.iterator();
        if (it != null) {
          while(true)  {
            int doc = it.nextDoc();
            if (doc >= limit) {
              break;

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    final AtomicReaderContext readerContext = reader.getContext();
    boolean any = false;
    for (QueryAndLimit ent : queriesIter) {
      Query query = ent.query;
      int limit = ent.limit;
      final DocIdSet docs = new QueryWrapperFilter(query).getDocIdSet(readerContext, reader.getLiveDocs());
      if (docs != null) {
        final DocIdSetIterator it = docs.iterator();
        if (it != null) {
          while(true)  {
            int doc = it.nextDoc();
            if (doc >= limit) {
              break;

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        assertEquals("invalid doc ID: " + iter.getDocID(), doc++, iter.getDocID());
        assertEquals("invalid score: " + iter.getScore(), ScoredDocIDsIterator.DEFAULT_SCORE, iter.getScore(), 0.0f);
      }
      assertEquals("invalid maxDoc: " + doc, maxDoc, doc);
      
      DocIdSet docIDs = all.getDocIDs();
      assertTrue("should be cacheable", docIDs.isCacheable());
      DocIdSetIterator docIDsIter = docIDs.iterator();
      assertEquals("nextDoc() hasn't been called yet", -1, docIDsIter.docID());
      assertEquals(0, docIDsIter.nextDoc());
      assertEquals(1, docIDsIter.advance(1));
      // if advance is smaller than current doc, advance to cur+1.
      assertEquals(2, docIDsIter.advance(0));

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      // NOTE: we cannot pass acceptDocs here because this
      // will (most likely, justifiably) cause the filter to
      // not return a FixedBitSet but rather a
      // BitsFilteredDocIdSet.  Instead, we filter by
      // acceptDocs when we score:
      final DocIdSet parents = parentsFilter.getDocIdSet(readerContext, null);


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

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      // NOTE: we cannot pass acceptDocs here because this
      // will (most likely, justifiably) cause the filter to
      // not return a FixedBitSet but rather a
      // BitsFilteredDocIdSet.  Instead, we filter by
      // acceptDocs when we score:
      final DocIdSet parents = parentsFilter.getDocIdSet(readerContext, null);


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

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      }
      return;
    }


    for (int i = 0; i < _subReaders.length; i++) {
      DocIdSet filterDocIdSet = filter.getDocIdSet(_subReaders[i]);
      if (filterDocIdSet == null) return;  //shall we use return or continue here ??
      int docStart = start + _docStarts[i];
      collector.setNextReader(_subReaders[i], docStart);
      validator.setNextReader(_subReaders[i], docStart);
      Scorer scorer = weight.scorer(_subReaders[i], true, false);
      if (scorer!=null){
        collector.setScorer(scorer);
        DocIdSetIterator filterDocIdIterator = filterDocIdSet.iterator(); // CHECKME: use ConjunctionScorer here?


        if(filterDocIdIterator == null)
          continue;
        
        int doc = -1;

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        RandomAccessDocIdSet s = f.getRandomAccessDocIdSet(reader);
        list.add(s);
        randomAccessList.add(s);
      }
      final RandomAccessDocIdSet[] randomAccessDocIdSets = randomAccessList.toArray(new RandomAccessDocIdSet[randomAccessList.size()]);
      final DocIdSet andDocIdSet = new AndDocIdSet(list);
      return new RandomAccessDocIdSet()
      {
        @Override
        public boolean get(int docId)
        {
          for(RandomAccessDocIdSet s : randomAccessDocIdSets)
          {
            if(!s.get(docId)) return false;
          }
          return true;
        }


        @Override
        public DocIdSetIterator iterator() throws IOException
        {
          return andDocIdSet.iterator();
        }
      };
    }
  }

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    long count = bitset.cardinality();
  
    if (count == 0)
    {
      final DocIdSet empty = EmptyDocIdSet.getInstance();
      return new RandomAccessDocIdSet()
      {
        @Override
        public boolean get(int docId)
        {
          return false;
        }
    
        @Override
        public DocIdSetIterator iterator() throws IOException
        {
          return empty.iterator();
        }         
      };
    }
    else
    {

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