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.


  private Iterable<String> getFields(IndexReader reader) throws IOException {
    Set<String> fields = new TreeSet<String>();
    for (IndexReaderContext ctext : reader.getContext().leaves()) {
      AtomicReaderContext atomicReaderContext = (AtomicReaderContext) ctext;
      AtomicReader atomicReader = atomicReaderContext.reader();
      if (atomicReader instanceof SegmentReader) {
        for (String f : atomicReader.fields()) {
          fields.add(f);
        }
      }
    }
    return fields;

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      if (_isClosed.get()) {
        LOG.info("Context [{0}] index closed", context);
        return null;
      }
      AtomicReaderContext atomicReaderContext = (AtomicReaderContext) ctext;
      AtomicReader atomicReader = atomicReaderContext.reader();
      if (atomicReader instanceof SegmentReader) {
        SegmentReader segmentReader = (SegmentReader) atomicReader;
        if (segmentReader.getSegmentName().equals(segmentName)) {
          return segmentReader.directory();
        }

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      if (_isClosed.get()) {
        LOG.info("Context [{0}] index closed", context);
        return null;
      }
      AtomicReaderContext atomicReaderContext = (AtomicReaderContext) ctext;
      AtomicReader atomicReader = atomicReaderContext.reader();
      results.putAll(sampleIndex(atomicReader, context));
    }
    return results;
  }

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    this.fieldName = fieldName;
  }


  @Override
  public void loadNewCacheValues(AtomicReaderContext context) throws IOException {
    final AtomicReader reader = context.reader();
    currentCache = FieldCache.DEFAULT.getFloats( reader, fieldName, false );
  }

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    this.fieldName = fieldName;
  }


  @Override
  public void loadNewCacheValues(AtomicReaderContext context) throws IOException {
    final AtomicReader reader = context.reader();
    currentCache = FieldCache.DEFAULT.getLongs( reader, fieldName, false );
  }

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    this.fieldName = fieldName;
  }


  @Override
  public void loadNewCacheValues(AtomicReaderContext context) throws IOException {
    final AtomicReader reader = context.reader();
    currentCache = FieldCache.DEFAULT.getInts( reader, fieldName, false );
  }

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    this.fieldName = fieldName;
  }


  @Override
  public void loadNewCacheValues(AtomicReaderContext context) throws IOException {
    final AtomicReader reader = context.reader();
    currentCache = FieldCache.DEFAULT.getTerms( reader, fieldName, false );
  }

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    this.fieldName = fieldName;
  }


  @Override
  public void loadNewCacheValues(AtomicReaderContext context) throws IOException {
    final AtomicReader reader = context.reader();
    currentCache = FieldCache.DEFAULT.getDoubles( reader, fieldName, false );
  }

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  }


  private void initFacetCounts(AtomicReaderContext context) throws IOException {
    String fieldName = facetRequest.getFieldName();
    // term are enumerated by field name and within field names by term value
    final AtomicReader atomicReader = context.reader();
    final Terms terms = atomicReader.terms( fieldName );
    if ( terms == null ) {
      //if the Reader has no fields at all,
      //undefined field or no matches
      return;
    }

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      }
      subSets = FilterOptimizationHelper.mergeByBitAnds( subSets );
      if ( subSets.size() == 1 ) {
        return subSets.get( 0 );
      }
      final AtomicReader reader = context.reader();
      return new AndDocIdSet( subSets, reader.maxDoc() );
    }
  }

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