Examples of org.apache.lucene.index.AtomicReaderContext

org.apache.lucene.index.AtomicReaderContext
{@link IndexReaderContext} for {@link AtomicReader} instances.

   * @throws BooleanQuery.TooManyClauses If a query would exceed 
   *         {@link BooleanQuery#getMaxClauseCount()} clauses.
   */
  protected Explanation explain(Weight weight, int doc) throws IOException {
    int n = ReaderUtil.subIndex(doc, leafContexts);
    final AtomicReaderContext ctx = leafContexts.get(n);
    int deBasedDoc = doc - ctx.docBase;
    
    return weight.explain(ctx, deBasedDoc);
  }

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      assert slice.leaves.length == 1;
      final TopFieldDocs docs = searcher.search(Arrays.asList(slice.leaves),
          weight, after, nDocs, sort, true, doDocScores || sort.needsScores(), doMaxScore);
      lock.lock();
      try {
        final AtomicReaderContext ctx = slice.leaves[0];
        final int base = ctx.docBase;
        hq.setNextReader(ctx);
        hq.setScorer(fakeScorer);
        for(ScoreDoc scoreDoc : docs.scoreDocs) {
          fakeScorer.doc = scoreDoc.doc - base;

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    Directory dir = newDirectory();
    RandomIndexWriter writer = new RandomIndexWriter(random(), dir);
    writer.close();


    IndexReader reader = SlowCompositeReaderWrapper.wrap(DirectoryReader.open(dir));
    AtomicReaderContext context = (AtomicReaderContext) reader.getContext();
    MockFilter filter = new MockFilter();
    CachingWrapperFilter cacher = new CachingWrapperFilter(filter);


    // first time, nested filter is called
    DocIdSet strongRef = cacher.getDocIdSet(context, context.reader().getLiveDocs());
    assertTrue("first time", filter.wasCalled());


    // make sure no exception if cache is holding the wrong docIdSet
    cacher.getDocIdSet(context, context.reader().getLiveDocs());


    // second time, nested filter should not be called
    filter.clear();
    cacher.getDocIdSet(context, context.reader().getLiveDocs());
    assertFalse("second time", filter.wasCalled());


    reader.close();
    dir.close();
  }

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    Directory dir = newDirectory();
    RandomIndexWriter writer = new RandomIndexWriter(random(), dir);
    writer.close();


    IndexReader reader = SlowCompositeReaderWrapper.wrap(DirectoryReader.open(dir));
    AtomicReaderContext context = (AtomicReaderContext) reader.getContext();


    final Filter filter = new Filter() {
      @Override
      public DocIdSet getDocIdSet(AtomicReaderContext context, Bits acceptDocs) {
        return null;
      }
    };
    CachingWrapperFilter cacher = new CachingWrapperFilter(filter);


    // the caching filter should return the empty set constant
    assertNull(cacher.getDocIdSet(context, context.reader().getLiveDocs()));
    
    reader.close();
    dir.close();
  }

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    Directory dir = newDirectory();
    RandomIndexWriter writer = new RandomIndexWriter(random(), dir);
    writer.close();


    IndexReader reader = SlowCompositeReaderWrapper.wrap(DirectoryReader.open(dir));
    AtomicReaderContext context = (AtomicReaderContext) reader.getContext();


    final Filter filter = new Filter() {
      @Override
      public DocIdSet getDocIdSet(AtomicReaderContext context, Bits acceptDocs) {
        return new DocIdSet() {
          @Override
          public DocIdSetIterator iterator() {
            return null;
          }
        };
      }
    };
    CachingWrapperFilter cacher = new CachingWrapperFilter(filter);


    // the caching filter should return the empty set constant
    assertNull(cacher.getDocIdSet(context, context.reader().getLiveDocs()));
    
    reader.close();
    dir.close();
  }

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    dir.close();
  }
  
  private static void assertDocIdSetCacheable(IndexReader reader, Filter filter, boolean shouldCacheable) throws IOException {
    assertTrue(reader.getContext() instanceof AtomicReaderContext);
    AtomicReaderContext context = (AtomicReaderContext) reader.getContext();
    final CachingWrapperFilter cacher = new CachingWrapperFilter(filter);
    final DocIdSet originalSet = filter.getDocIdSet(context, context.reader().getLiveDocs());
    final DocIdSet cachedSet = cacher.getDocIdSet(context, context.reader().getLiveDocs());
    if (originalSet == null) {
      assertNull(cachedSet);
    }
    if (cachedSet == null) {
      assertTrue(originalSet == null || originalSet.iterator() == null);

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    testRange(2);
  }
  
  @Test
  public void testInverseRange() throws Exception {
    AtomicReaderContext context = SlowCompositeReaderWrapper.wrap(reader).getContext();
    NumericRangeFilter<Integer> f = NumericRangeFilter.newIntRange("field8", 8, 1000, -1000, true, true);
    assertNull("A inverse range should return the null instance", f.getDocIdSet(context, context.reader().getLiveDocs()));
    f = NumericRangeFilter.newIntRange("field8", 8, Integer.MAX_VALUE, null, false, false);
    assertNull("A exclusive range starting with Integer.MAX_VALUE should return the null instance", f.getDocIdSet(context, context.reader().getLiveDocs()));
    f = NumericRangeFilter.newIntRange("field8", 8, null, Integer.MIN_VALUE, false, false);
    assertNull("A exclusive range ending with Integer.MIN_VALUE should return the null instance", f.getDocIdSet(context, context.reader().getLiveDocs()));
  }

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    dq.add(tq("dek", "DOES_NOT_EXIST"));
    
    QueryUtils.check(random(), dq, s);
    assertTrue(s.getTopReaderContext() instanceof AtomicReaderContext);
    final Weight dw = s.createNormalizedWeight(dq);
    AtomicReaderContext context = (AtomicReaderContext)s.getTopReaderContext();
    final Scorer ds = dw.scorer(context, true, false, context.reader().getLiveDocs());
    final boolean skipOk = ds.advance(3) != DocIdSetIterator.NO_MORE_DOCS;
    if (skipOk) {
      fail("firsttime skipTo found a match? ... "
          + r.document(ds.docID()).get("id"));
    }

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    dq.add(tq("dek", "albino"));
    dq.add(tq("dek", "DOES_NOT_EXIST"));
    assertTrue(s.getTopReaderContext() instanceof AtomicReaderContext);
    QueryUtils.check(random(), dq, s);
    final Weight dw = s.createNormalizedWeight(dq);
    AtomicReaderContext context = (AtomicReaderContext)s.getTopReaderContext();
    final Scorer ds = dw.scorer(context, true, false, context.reader().getLiveDocs());
    assertTrue("firsttime skipTo found no match",
        ds.advance(3) != DocIdSetIterator.NO_MORE_DOCS);
    assertEquals("found wrong docid", "d4", r.document(ds.docID()).get("id"));
  }

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  }


  @Override
  public DocIdSet getDocIdSet(final AtomicReaderContext context, final Bits acceptDocs) throws IOException {
    // get a private context that is used to rewrite, createWeight and score eventually
    final AtomicReaderContext privateContext = context.reader().getContext();
    final Weight weight = new IndexSearcher(privateContext).createNormalizedWeight(query);
    return new DocIdSet() {
      @Override
      public DocIdSetIterator iterator() throws IOException {
        return weight.scorer(privateContext, true, false, acceptDocs);

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