Examples of org.apache.lucene.index.AtomicReader

org.apache.lucene.index.AtomicReader
{@code AtomicReader} is an abstract class, providing an interface for accessing anindex. Search of an index is done entirely through this abstract interface, so that any subclass which implements it is searchable. IndexReaders implemented by this subclass do not consist of several sub-readers, they are atomic. They support retrieval of stored fields, doc values, terms, and postings.
For efficiency, in this API documents are often referred to via document numbers, non-negative integers which each name a unique document in the index. These document numbers are ephemeral -- they may change as documents are added to and deleted from an index. Clients should thus not rely on a given document having the same number between sessions.

NOTE: {@link IndexReader} instances are completely threadsafe, meaning multiple threads can call any of its methods, concurrently. If your application requires external synchronization, you should not synchronize on the IndexReader instance; use your own (non-Lucene) objects instead.

    if (startWith == null) {
      startWith = "";
    }
    Term term = getTerm(columnFamily, columnName, startWith);
    List<String> terms = new ArrayList<String>(size);
    AtomicReader areader = BlurUtil.getAtomicReader(reader);
    Terms termsAll = areader.terms(term.field());
    TermsEnum termEnum = termsAll.iterator(null);
    BytesRef currentTermText;
    while ((currentTermText = termEnum.next()) != null) {
      terms.add(currentTermText.utf8ToString());
      if (terms.size() >= size) {

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          dims[dim] = new DrillSidewaysScorer.DocsEnumsAndFreq();
          dims[dim].sidewaysCollector = drillSidewaysCollectors[dim];
          String field = drillDownTerms[dim][0].field();
          dims[dim].dim = drillDownTerms[dim][0].text();
          if (lastField == null || !lastField.equals(field)) {
            AtomicReader reader = context.reader();
            Terms terms = reader.terms(field);
            if (terms != null) {
              termsEnum = terms.iterator(null);
            } else {
              termsEnum = null;
            }

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    }
    
    DocIdSetIterator it = set.iterator();
    int doc = it.nextDoc(); 
    for (AtomicReaderContext context : reader.leaves()) {
      AtomicReader r = context.reader();
      final int maxDoc = r.maxDoc() + context.docBase;
      if (doc >= maxDoc) { // skip this segment
        continue;
      }
      if (!r.hasDeletions()) { // skip all docs that belong to this reader as it has no deletions
        while ((doc = it.nextDoc()) < maxDoc) {}
        continue;
      }
      Bits liveDocs = r.getLiveDocs();
      do {
        if (!liveDocs.get(doc - context.docBase)) {
          set.clear(doc);
        }
      } while ((doc = it.nextDoc()) < maxDoc);

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      }
      bi.setText(content);
      int doc = docids[i];
      int leaf = ReaderUtil.subIndex(doc, leaves);
      AtomicReaderContext subContext = leaves.get(leaf);
      AtomicReader r = subContext.reader();
      Terms t = r.terms(field);
      if (t == null) {
        continue; // nothing to do
      }
      if (leaf != lastLeaf) {
        termsEnum = t.iterator(null);

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  public void testEmptyIndex() throws Exception {
    Directory dir = newDirectory();
    IndexWriter writer= new IndexWriter(dir, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random())).setMaxBufferedDocs(500));
    writer.close();
    IndexReader r = DirectoryReader.open(dir);
    AtomicReader reader = SlowCompositeReaderWrapper.wrap(r);
    FieldCache.DEFAULT.getTerms(reader, "foobar", true);
    FieldCache.DEFAULT.getTermsIndex(reader, "foobar");
    FieldCache.DEFAULT.purgeByCacheKey(reader.getCoreCacheKey());
    r.close();
    dir.close();
  }

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      doc.add(new SortedSetDocValuesField("sortedset", new BytesRef("sortedset value2")));
    }
    iw.addDocument(doc);
    DirectoryReader ir = iw.getReader();
    iw.close();
    AtomicReader ar = getOnlySegmentReader(ir);
    
    BytesRef scratch = new BytesRef();
    
    // Binary type: can be retrieved via getTerms()
    try {

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    Document doc = new Document();
    iw.addDocument(doc);
    DirectoryReader ir = iw.getReader();
    iw.close();
    
    AtomicReader ar = getOnlySegmentReader(ir);
    
    final FieldCache cache = FieldCache.DEFAULT;
    cache.purgeAllCaches();
    assertEquals(0, cache.getCacheEntries().length);

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    doc.add(new StoredField("bogusbits", "bogus"));
    iw.addDocument(doc);
    DirectoryReader ir = iw.getReader();
    iw.close();
    
    AtomicReader ar = getOnlySegmentReader(ir);
    
    final FieldCache cache = FieldCache.DEFAULT;
    cache.purgeAllCaches();
    assertEquals(0, cache.getCacheEntries().length);

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   * <p>
   * The default implementation calls {@link #addSortedField}, passing
   * an Iterable that merges ordinals and values and filters deleted documents .
   */
  public void mergeSortedField(FieldInfo fieldInfo, final MergeState mergeState, List<SortedDocValues> toMerge) throws IOException {
    final AtomicReader readers[] = mergeState.readers.toArray(new AtomicReader[toMerge.size()]);
    final SortedDocValues dvs[] = toMerge.toArray(new SortedDocValues[toMerge.size()]);
    
    // step 1: iterate thru each sub and mark terms still in use
    TermsEnum liveTerms[] = new TermsEnum[dvs.length];
    for (int sub = 0; sub < liveTerms.length; sub++) {
      AtomicReader reader = readers[sub];
      SortedDocValues dv = dvs[sub];
      Bits liveDocs = reader.getLiveDocs();
      if (liveDocs == null) {
        liveTerms[sub] = dv.termsEnum();
      } else {
        OpenBitSet bitset = new OpenBitSet(dv.getValueCount());
        for (int i = 0; i < reader.maxDoc(); i++) {
          if (liveDocs.get(i)) {
            int ord = dv.getOrd(i);
            if (ord >= 0) {
              bitset.set(ord);
            }

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   * <p>
   * The default implementation calls {@link #addSortedSetField}, passing
   * an Iterable that merges ordinals and values and filters deleted documents .
   */
  public void mergeSortedSetField(FieldInfo fieldInfo, final MergeState mergeState, List<SortedSetDocValues> toMerge) throws IOException {
    final AtomicReader readers[] = mergeState.readers.toArray(new AtomicReader[toMerge.size()]);
    final SortedSetDocValues dvs[] = toMerge.toArray(new SortedSetDocValues[toMerge.size()]);
    
    // step 1: iterate thru each sub and mark terms still in use
    TermsEnum liveTerms[] = new TermsEnum[dvs.length];
    for (int sub = 0; sub < liveTerms.length; sub++) {
      AtomicReader reader = readers[sub];
      SortedSetDocValues dv = dvs[sub];
      Bits liveDocs = reader.getLiveDocs();
      if (liveDocs == null) {
        liveTerms[sub] = dv.termsEnum();
      } else {
        OpenBitSet bitset = new OpenBitSet(dv.getValueCount());
        for (int i = 0; i < reader.maxDoc(); i++) {
          if (liveDocs.get(i)) {
            dv.setDocument(i);
            long ord;
            while ((ord = dv.nextOrd()) != SortedSetDocValues.NO_MORE_ORDS) {
              bitset.set(ord);

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